Re: what is the upper limit of maximum heap memory for Tomcat with 32-bit JVM running on Red Hat Linux 4 (32-bit)
2. Your other 'workaround' is to install a 64 bit OS and a 64 bit JVM. Then you can have 7G+ for the JVM. Actually, to be totally clear, you can have pretty much as much memory as you have physical ram in the machine. In your case that's 7G+ For more info on the 64bit JVM see http://java.sun.com/docs/hotspot/HotSpotFAQ.html#64bit_heap Apparently RHEL 4 x64 supports up to 16GB and RHEL 5 claims 'unlimited' but I'll bet no-one has actually tried it with 16 TB. Regards Alan Chaney Li,Henry wrote: My Tomcat is running on 32-bit Red Hat 4 (2.6.9-78.0.1.ELsmp), host server has 8G physical memory and 4 processors. java version 1.4.2 gcj (GCC) 3.4.6 20060404 (Red Hat 3.4.6-10) I got java.lang.OutOfMemoryError Current configuration: -Xms1024M -Xmx2304M The host server has about 4.5G free memory. When I tried to increase -Xmx2304M to -Xmx3000M, I got this error: Error occurred during initialization of VM, Could not reserve enough space for object heap The maximum # I can reach is -Xmx2680M. QUESTION: Is there an upper limit for -Xmx? What is the work around? How can I use my free memory on the server to get rid of the OutOfMemoryError? Thanks, Henry - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org !DSPAM:4a68f4e844863033718476! - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: what is the upper limit of maximum heap memory for Tomcat with 32-bit JVM running on Red Hat Linux 4 (32-bit)
You are using a 32 bit operating system and a 32 bit processor. To make more than 4GB of ram available you must ensure that you have PAE support enabled in your kernel (search Google for Physical Address Extension) which may mean re-compiling for RHEL 4 (see Red Hat). Your processor may not support it but I'd suspect that when you say 4 processors you probably mean 4 cores and I believe all 4 core Intel CPUs do support PAE. Re-reading your email I see that you say that you have 4.5G of free memory - how did you determine this? 'top'? Even so, I cannot find any clear statement on the web that the 32 bit JRE will be able to address more than 4G even if you do have PAE enabled. I suspect not. Actually, 'suspect' is way too mild a term ... I would be completely astounded if you could... Possible workarounds are: 1. Try running 2 JVMs ( when you have PAE enabled) - of course this may not work in your application (you'd have to have two Tomcat instances.) 2. Your other 'workaround' is to install a 64 bit OS and a 64 bit JVM. Then you can have 7G+ for the JVM. Regards Alan Chaney Li,Henry wrote: My Tomcat is running on 32-bit Red Hat 4 (2.6.9-78.0.1.ELsmp), host server has 8G physical memory and 4 processors. java version 1.4.2 gcj (GCC) 3.4.6 20060404 (Red Hat 3.4.6-10) I got java.lang.OutOfMemoryError Current configuration: -Xms1024M -Xmx2304M The host server has about 4.5G free memory. When I tried to increase -Xmx2304M to -Xmx3000M, I got this error: Error occurred during initialization of VM, Could not reserve enough space for object heap The maximum # I can reach is -Xmx2680M. QUESTION: Is there an upper limit for -Xmx? What is the work around? How can I use my free memory on the server to get rid of the OutOfMemoryError? Thanks, Henry !DSPAM:4a68ee3b41041381456296! - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: The best place for implementing context specific behavior?
Andre André Warnier wrote: Pid wrote: The Filter checks the domain name is suitable, /looks up a config object/ and drops it into the request attributes for use on the page. Ha ! I believe that this is exactly what Jonathan is (or was originally) looking for. Where is this config object, and when and how is it being initialised ? One place to keep filter configuration information is as an attribute of the ServletContext. This can be obtained with the FilterConfig.getServletContext method. The FilterConfig object is a parameter of the doFilter method of the Filter. (See http://java.sun.com/javaee/5/docs/api/) This works within any one web app. I'm continuing for myself right now, just to learn how to do this correctly. Suppose I do want to do something different in my (shared, common, whatever) webapp, depending on the Host: header of the request. And suppose this different thing I want to do, is a bit heavy, so I don't want to do it all at each request, I want to do some of that work ahead of time, and re-use it for each request afterward. But the requests come in unpredictable order, all to my same webapp, but one for apples.company.com, and the following one for bananas.company.com etc. And when one comes in for bananas, I want to retrieve what I had earlier prepared for bananas, and not what I had prepared for lemons. (In other words, I don't want a fruit salad, I want to enjoy each fruit separately). You can write an object which handles the specific processing for each host and then create a Map as the attribute in the ServletContext using the host name as the key. At the start of each request in your Filter you could retrieve the object by using the host name as the key, do whatever host specific processing you need. You can add a ContextListener in web.xml will will allow you to do any servlet startup/shutdown operations. There are other ways, but the above should work. Regards Alan Chaney - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Reading POSTed data
Caldarale, Charles R wrote: From: Christopher Schultz [mailto:ch...@christopherschultz.net] Subject: Re: Reading POSTed data The servlet spec is very clear about when the request is consumed to fulfill a getParameter call and when the request is specifically /not/ consumed. What I find problematic is that the spec gives no hint about how to process POST data that is not parameterized. Lack of mentioning any alternative gives the impression that parameterization is the only way of handling it, whereas real-world practice is quite different. - Chuck I have an application which extensively uses message data in POST requests so I was a bit concerned by your comment above. However, P36 of my copy of the 2.4 servlet spec (sec SRV 4.1.1) says If [the POST Form data conditions] are not met and the post form data is not included in the parameter set, the post data must still be available to the servet via the request object's input stream. I don't want to appear picky, but that doesn't actually seem that problematic. If you don't set the content type as application/x-ww-form-urlencoded then you should be able to read it via the input stream Regards Alan Chaney THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY MATERIAL and is thus for use only by the intended recipient. If you received this in error, please contact the sender and delete the e-mail and its attachments from all computers. !DSPAM:4a3bf2e676342136417547! - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: new installation uid / pwd problem
Hi Ron Ronald G. Belcher wrote: I'm a newbie who just installed Tomcat 5.5. Installation messages told me the userid was tomcat55. When I attempted to view Status, Tomcat Administration, or Tomcat Manager from my browser, I was asked for a userid and pw. Of course, not knowing the password, I was treated to a message that said Access to the requested resource has been denied. Now I can't seem to do anything to get past the error, not even rebooting and/or restarting Tomcat. Help! Ron Please specify: tomcat version, jdk version, operating system version. Did you install tomcat by downloading from the tomcat.apache.org site? or is it a linux distro version. If the latter, then probably best to install the proper tomcat.apache.org version. You won't get much help on this list unless you do... To give you some guidance on your specific problem above http://tomcat.apache.org/tomcat-5.5-doc/realm-howto.html which will explain amongst other things that the 'default' security realm is controlled by a file called tomcat-users.xml in the $TOMCAT_HOME/conf directory. You will need to edit that file and then restart tomcat. You will also need to read (most) of the documents carefully. I guess you've got the linux distro because it would be much better to start with the currrent release version (6.0) than 5.5 HTH Alan Chaney - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: apache/tomcat communication issues (502 response)
Hi Andre André Warnier wrote: feedly team wrote: [...] using netstat, i see a moderate number (~80) of tomcat's sockets in the CLOSE_WAIT state, not sure if this is relevant. Approximately, because I am not sure I have this really understood yet : a TCP CLOSE_WAIT state happens when the writing side of a TCP connection has finished writing and (nicely) closes its side of the socket to indicate the fact, but the reading side of the connection does not read what is left in the buffers, so there is still some data unread in the pipeline, and the reading side never closes the socket. And now I'm stuck in my explanation, because I am not sure which side is seeing the CLOSE_WAIT... ;-) I think that you are indicating one condition in which you can see a CLOSE_WAIT but there are many others. I also think that the condition you indicate is appropriate when the CLOSE_WAIT is observed at the receiving end of a communication, but is possible for a socket to be in this state when it has sent data as well, but of course there will be no outstanding data to send. More generally CLOSE_WAIT is the state in which a socket is left AFTER the other end says its finished and BEFORE the application which is using the socket actually closes the socket. The WAIT refers to the operating system waiting for the application to finish using the socket. I think a socket can be in a CLOSE_WAIT state without there being any further data to read or write - literally just waiting for the calling application to close it. Having written socket handling code for both Java and C++ on a variety of platforms I don't think there is any particular reason why Java should be better or worse (in fact, code which uses sockets in Java is generally pretty easy.) I suspect that your observations may be affected by local conditions eg one application is badly written but represents a lot of your network activity, so its behavior is predominant in conditioning your thinking. Or not! :) regards Alan Chaney But anyway, it indicates a problem somewhere in one of the two applications, my guess being the reading one. It should do more reads to exhaust the remaining data, get an end-of-stream, then close its side of the connection, but it never does. There is apparently no timeout for that, so the OS can never get rid of that socket, which probably leaves a bunch of things hanging around and consuming resources that they shouldn't. On one of our systems, I have occasionally seen this issue grow until the point where the system seemed unable to accept new connections. Now whether that has any bearing on your particular issue, I don't know. But it sure indicates a logical problem somewhere. There is quite a bit on the subject on Google, of unequal quality. If someone knows a more rigorous explanation, please go ahead. I will still add a purely sibjective and personal note : from personal experience, this phenomenon seems to happens more frequently whith Java applications than with others, so I would guess that there might be something in the Java handling of sockets that makes it a bit harder to write correct socket-handling code. A Java expert may want to comment on that too. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org !DSPAM:49dc6634305142136417547! - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Can only view pages on localhost
Hi Joel Joel wrote: I am a new user of Tomcat. In my test system I have pc's networked via a wireless router. The router assigns the IP address of 192.168.0.2 to the machine that runs Tomcat. When I run Tomcat using http://localhost/... or http://192.168.0.2/... everything works fine when I work on the local machine. But when I attempt to view web pages from any other machine on the network using http://192.168.0.2/... I get timed out. How should I configure Tomcat so that it accepts requests from other machines -- not just localhost? You don't mention operating system, tomcat version, jdk version - all of which would make it easier to help you. However, one wild guess is that you have a firewall which is preventing the other networked machine(s) from accessing the tomcat instance. HTH Alan Chaney - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: not valid Tomcat installation
Sergey (and FYI Andre) For each server Eclipse uses, you must create a new entry in the 'Servers' folder. I'm assuming that you are using eclipse 3.3+ with WTP (Web Tools Project) plugins. One way to do it is as follows: From main menu Window-Preferences Select 'Server' click on triangle to get the drop down list and then select 'Runtime Environment' The select 'Add' You will get a list, the first of which is 'Apache' select Apache Tomcat v6.0 and then 'Next' now you will be at a menu called 'Tomcat Server Specify the installation directory' Use Browse to select the folder in which you installed Tomcat. It will check to see that it has the right files in it. You can specify the JRE that tomcat is run with below. You may want to use a different JRE than the one that you are running Eclipse with. For example, I start and run eclipse with a JDK1.5 but compile and run my applications with JRE from the 1.6 JDK. You can have more than one tomcat server defined in eclipse. Its up to you to configure them using the Server properties page to ensure that they use different ports. HTH - also see Eclipse Help Regards Alan Chaney Sergey Livanov wrote: no, I have only tc 6.0.18 CATALINA_HOME points to c:\tomcat 2009/3/21 André Warnier a...@ice-sa.com 2009/3/21 André Warnier a...@ice-sa.com Sergey Livanov wrote: I install Tomcat 6.0.18 in c:\tomcat. When add the new server Eclipse writes that tomcat install directory is not correct. It does not point to valid Tomcat installation. What should I do ? I don't now Eclipse at all, but how does it normally find out the path of a Tomcat installation ? When I add a new server I specify a path where Tomcat installed before. Tc5.r I installed without problems. If you still have both Tomcats, Eclipse may get confused. Is there by any chance a CATALINA_HOME variable defined, that points to something else ? (open a command window, type set and look) - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org !DSPAM:49c50f9b246552009820482! - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: not valid Tomcat installation
Actually I missed the final step!! Right click in the Servers panel and New-Server will let you add the server. Then you can add web projects as required. Regards Alan Alan Chaney wrote: Sergey (and FYI Andre) For each server Eclipse uses, you must create a new entry in the 'Servers' folder. I'm assuming that you are using eclipse 3.3+ with WTP (Web Tools Project) plugins. One way to do it is as follows: From main menu Window-Preferences Select 'Server' click on triangle to get the drop down list and then select 'Runtime Environment' The select 'Add' You will get a list, the first of which is 'Apache' select Apache Tomcat v6.0 and then 'Next' now you will be at a menu called 'Tomcat Server Specify the installation directory' Use Browse to select the folder in which you installed Tomcat. It will check to see that it has the right files in it. You can specify the JRE that tomcat is run with below. You may want to use a different JRE than the one that you are running Eclipse with. For example, I start and run eclipse with a JDK1.5 but compile and run my applications with JRE from the 1.6 JDK. You can have more than one tomcat server defined in eclipse. Its up to you to configure them using the Server properties page to ensure that they use different ports. HTH - also see Eclipse Help Regards Alan Chaney Sergey Livanov wrote: no, I have only tc 6.0.18 CATALINA_HOME points to c:\tomcat 2009/3/21 André Warnier a...@ice-sa.com 2009/3/21 André Warnier a...@ice-sa.com Sergey Livanov wrote: I install Tomcat 6.0.18 in c:\tomcat. When add the new server Eclipse writes that tomcat install directory is not correct. It does not point to valid Tomcat installation. What should I do ? I don't now Eclipse at all, but how does it normally find out the path of a Tomcat installation ? When I add a new server I specify a path where Tomcat installed before. Tc5.r I installed without problems. If you still have both Tomcats, Eclipse may get confused. Is there by any chance a CATALINA_HOME variable defined, that points to something else ? (open a command window, type set and look) - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org !DSPAM:49c515bf249199080218370! - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Vmware Server 2 web interface uses tomcat but hogs 8005 and 8009
Chris Christopher Schultz wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Rainer, On 3/17/2009 4:18 AM, Rainer Frey (Inxmail GmbH) wrote: On Monday 16 March 2009 22:42:27 Christopher Schultz wrote: Can you clarify this a bit? There is no special management instance. VMWare Server is an application that runs on a regular host operating system instance (it installs linux kernel modules though, and probably also Windows drivers). Interesting. This used to be called VMWare Workstation. Rainer's right - there's Vmware Server and Workstation (and others, eg the GSX product range.) I've used Server 1 and workstation on several machines and several operating systems for four years. My annoyance was the configuration of Server 2. Server 1 came with a separate application (VMware console) that you could use to connect to both local and remote clients. Server 2 has replaced this with a web ui. They (meaning this user on the VMWare community, who might or might not be associated with VMWare) say not to run server software on that host operating system. I take that as a recommendation to dedicate a machine to one purpose only (VM hosting in that case), which is common practice in many production environments, but no strict requirement. Yes, I accept I was a little frustrated at the time - my sentence was not intended to imply that Vmware had made the above statement, but more that I couldn't find any answer to the problem on their site. Okay, this makes sense (not the recommendation, just the explanation). What do you mean with the other end? I use VMWare Server 2 on Ubuntu (original tar.gz install from vmware.com), also found that it blocks the said ports, and simply changed the server.xml of the VMWare Tomcat. And how did the client find it? If I missed how to do it, I apologize for wasting everybody's time but there is no mention in the docs, I could find nothing on Google and my experiments indicated that you need to change both client and server and I could only find the server configuration. He still wants the web manager to work, and the /client/ expects to connect on a certain port. If you change VMWare's server-side ports, the client can no longer connect. Correct. I still don't understand why Vmware didn't make this configurable. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Vmware Server 2 web interface uses tomcat but hogs 8005 and 8009
I've just wasted about a couple of hours sorting out an issue with Vmware server 2 and tomcat and I thought I'd pass it along, hoping to save someone else a small piece of frustration. I've been setting up a new development workstation (CentOS 5.2) and switched to using vmware server 2 (because version 1 is now moribund). Version 2 uses a web interface which is apparently 'served' from a local tomcat instance. Yay tomcat! However, in their infinite wisdom vmware have changed the default http and https ports from 8080 and 8443, but left the startup port at 8005 and the mod-jk port at 8009, and, what's more, not provided any way to change it. I spent some time looking to see whether these were configurable, but I found nothing, apart from a rather snotty message on the vmware bulletin boards stating that they didn't think that you should run a server on the same platform as a vmware setup which is odd, because A. I do in production all the time and it works fine and B. haven't they heard of development environments? I don't know about other people but I have all sorts of servers running on my workstation when I'm testing and debugging things. I found the vmware 'local' tomcat installation (6.0.16) and obviously you can edit the startup and mod-jk ports there, but then also obviously it stops working unless you can edit the 'other end' as it were and that doesn't appear possible. I hunted through all the available configuration files but the values must be hard-coded. So it seems that you must reconfigure any other local tomcat(s) on the same machine to use (a) different startup port(s). Hope that someone, someday, finds this helpful. I'd be interested if someone else finds out more about this. Alan Chaney - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: help again... what means these errors?
Hi Andre Totally agree with your comments with respect to the OP's first exception. However, they actually had two exceptions in their original email with completely different time stamps. The 2nd exception appears to be a HibernateException 01-Mar-2009 11:36:21 org.apache.catalina.core.StandardWrapperValve invoke SEVERE: Servlet.service() for servlet HumanReadableLinksServlet threw exception org.hibernate.TransactionException: Transaction not successfully started at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:100) at The cause of this is probably completely unconnected to a remote client disconnect. The error above is thrown under the following conditiions: (from http://www.hibernate.org/hib_docs/v3/api/org/hibernate/TransactionException.html Indicates that a transaction could not be begun, committed or rolled back. With the very limited information given it is iimpossible to infer the exact cause but I would suspect that likely possibilities are a severe resource contention on the database or possibly a transaction timeout. The OP gave these two errors but didn't indicate whether they were happening repeatedly or just one offs. One further possibility is a poor network setup causing failure to access the database and/or connection failures with the client. More information would be required to correctly diagnose the problem. I doubt very much that the problem or problems are directly connected with Tomcat - more likely the application or the system configuration. Regards Alan André Warnier wrote: Laura Bartolomé wrote: Hi again... We are going on findind errors and problems... and we wanna cry... We certainly would not want that to happen, because then your messages here would get all mushy and more difficult to read. And Tomcat would probably not care. someone could explain what means these errors? The first: 01-Mar-2009 00:08:46 org.apache.catalina.core.StandardWrapperValve invoke SEVERE: Servlet.service() for servlet HumanReadableLinksServlet threw exception java.net.SocketException: Connection reset by peer: socket write error at java.net.SocketOutputStream.socketWrite0(Native Method) at java.net.SocketOutputStream.socketWrite(Unknown Source) at java.net.SocketOutputStream.write(Unknown Source) The above rather self-explanatory message (Connection reset by peer: socket write error) typically means what it says : the client (browser ?) went away before the server could send a response to it. That usually means : either a) the user clicked the stop or cancel button in the browser, before he received the answer to his request or b) the impatient user clicked on another link on the current page, causing the browser to interrupt the current connection to the server and load the new page, before the server could send the response to the previous request The above 2 reasons probably cover at least 90% of the cases. It could be due to the application being so slow to answer, that the human user gets impatient and starts clicking all over. c) some communication problem occurred between the client and the server, causing the TCP connection to be closed prematurely. From personal experience, that may be due to some proxy or other in-between element, closing the connection because nothing happened on that connection for some time. Anyway, with 100% certainty, it means that when the server was ready to send the answer to the client, it could not, because the connection with the client had been closed for some reason. and the other: 01-Mar-2009 11:36:21 org.apache.catalina.core.StandardWrapperValve invoke SEVERE: Servlet.service() for servlet HumanReadableLinksServlet threw exception org.hibernate.TransactionException: Transaction not successfully started at I am no specialist, but according to the above message, that seems to be something in the hibernate application, not something coming from Tomcat itself. So you probably should ask in some hibernate forum what it means. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org !DSPAM:49aaa5fc82807785049143! - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: help again... what means these errors?
Sorry, didn't see the end! Alan André Warnier wrote: Alan Chaney wrote: Hi Andre Totally agree with your comments with respect to the OP's first exception. However, they actually had two exceptions in their original email with completely different time stamps. The 2nd exception appears to be a HibernateException Yes, which I mentioned also in my answer. You need to read to the end though... ;-) - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org !DSPAM:49aad1ae104581527717022! - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: error while building tomcat 5.5
Do you have write permission to the following directory as the user you are using to do the build? You may have to 'su' or 'sudo' or change the access permissions on /usr/share/java to allow the build script to write to it. Regards Alan Chaney h iroshan wrote: /usr/share/java/tomcat-native-1.1.12/tomcat-native.tar.gz - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: J2EE on Mac
Caldarale, Charles R wrote: That was already specified: the OP wants to compile servlets; nothing beyond a JDK is needed. - Chuck Everything said about J2EE, classpaths etc is perfectly correct. However, the other thing the OP said was that they want to use Eclipse on a Mac. To build web applications with eclipse the best thing to do is to install the appropriate web development add-ons - we use the Web Standard Tools (WST) options. This is best installed using the software updates option within Eclipse. After having done that and configured a local tomcat installation as a 'Server' within Eclipse you are, as they say, good to go and all you need to do is to select a new Dynamic Web Project when creating a new project. Eclipse then takes care of all the library and classpath issues. There is no need to download or install anything other than a binary tomcat, eclipse and then, within that, eclipse WST (or the combined package in the first place.) Let me just add that the above is an abridged summary to try to get the OP on the right path, not to start a long flame about the advantages and disadvantages of eclipse! Regards Alan Chaney - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Fwd: J2EE on Mac
Mighty Tornado wrote: Hi, I installed Tomcat on my mac OS X and it's running. I also have Eclipse Europa. Now I don't think I have J2EE installed - How do I do it? I went to Sun's website and it gave me an archive with GlassFish which I don't need. Can somebody please tell me where I can download the latest J2EE for Mac? What I need to do to compile servlets with it in Eclipse? Thank you. !DSPAM:49a24c91167621527717022! Dear Mighty, Re-reading your email again, you say that you installed Europa. AFAIK Europa comes with WTP installed. All you need to do is to download a tomcat release, configure that as a Server and then create a Dynamic Web Project. See the tutorials in the eclipse help. Works for Mac, PC, Linux, Solaris. Regards Alan Chaney ( a long time eclipse user with a major love-hate relationship with eclipse) - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Authenticating Users
Christopher Schultz wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Mark, I was the OP on this one. Mark just made a couple of suggestions. On 2/21/2009 4:06 PM, Mark Thomas wrote: 5. Patch DataSourceRealm 6. Make case sensitivity configurable and contribute your patch back to the ASF. 7. Use securityfilter to write your realm, and not be tied to Tomcat. Had a brief look at 'securityfilter' - however we actually do require container managed security as we have several applications. Other alternative as previously mentioined is acegi. 8. Many databases use case-insensitive string comparisons already. Case-insensitive passwords (probably a bad idea!) Actually, in general, I agree that its a bad idea. However, each case has to be handled in the light of the actual users expectations. In the case of this specific application the users are artists who are generally extremely computer naive. We commonly get support enquiries I can't log into my account EVEN THOUGH we have sent them their account names and passwords because they are not correctly capitalizing their usernames or passwords. It is important to keep to keep the case of usernames because, as I said, they are artists, and the capitalization may have significance to them as part of their brand. The information on the site is publically available after it has been published. There is no commercial or sensitive information on the site. will work if you aren't hashing them. If you are, you'll have to lowercase them or something. Exactly. One problem for a general solution is that there are variations in the name of the 'lowercase' function between databases. So far, I've found that Postgres, MySQL and Oracle appear to support 'lower()' but M/SQL has it as tolower() (thanks again MS) If you /are/ hashing them, you'll need to do a password migration where anyone who changes their password gets it lowercased but passwords that existed beforehand are still case-sensitive. You cannot avoid this, now matter what your solution is. In this specific case at the moment we aren't hashing them, but you raise a good general point about hashing which I'll have to think about. Regards Alan - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: How to close open connections after application stop?
Edoardo wrote I have resultset.close(); statement.close(); connection.close(); in my code. and connection = dataSource.getConnection(); seems very close to my ambiente = (Context) new InitialContext().lookup(java:comp/env); pool = (DataSource) ambiente.lookup(jdbc/myApp); Connection conn = pool.getConnection(); there are a lot of debug information in my code and seems that nothing is going wrong (no exceptions). but... if you post that it means that I am doing something wrong. Edoardo I don't think so. Let me recap your problem: When you undeploy an application from tomcat (using the DBCP pooling mechanism) you can't make STRUCTURAL changes to the database because it complains that connections are still in use. This is exactly what one would expect. I've encountered the same problem. When an application finishes with a database connection it is returned to the pool. That's exactly what a connection pool is for! As far as I can see by looking at the tomcat source code the connection pool is created at startup and remains active until TC shutdown. Once a connection has been obtained from the pool it may stay 'active' for the entire duration of the TC session (that is, from TC start to TC stop) Obviously, depending upon your usage, it is possible for more than one application in the same container to be reusing the same connection pool. Your original post indicates that only one app. is using the database. It seems to me that: 1. you could just shutdown tomcat! If this is a production site the best plan would be to write a script which renames the database and does whatever else you need, test it on a development machine and just find a 'quiet' time to shutdown the site, update the db and restart. 2. Move the connection pool into your application. Thus shutting down the application would shutdown the pool. 3. As I assume you are using DBCP in Tomcat, carefully read the DBCP docs, configure your system so that you can directly access the POOLED connections, keep a list of ALL the connections you use and then shut them down at the end. This is fraught with difficulty. Regards Alan - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Authenticating Users
Gregor Schneider wrote: To the OP: 1. May I ask what database it is you're using? Postgres - but a more general solution would be nice. 2- I'd go for the following solution: Create a JSP-page accepting the credentials. The username should be converted to uppercase. The password should be left as is so that case-sensivity here is maintained. That doesn't actually fit in with the Servlet CMS. I can easily decode the user name and password by your mechanism. However, then I have to rather extensively modify my code (covering 3 applications and 4 web services) to apply the credentials. What I was looking for was a way of extending what I already have. Don't know if I'm missing something, but to me that looks like a walk in the park. See above. The problem is not decoding the password, but making sure that the container managed security mechanism is maintained. So far, the best suggestions that I've had are: 1. Modify DataSourceRealm 2. Use secuirityfilter. From my point of view, as I don't use hashed passwords at the moment the easiest thing to do is to modify the DataSourceRealm as suggested by Mark Thomas. However, I think that the ability to extend the login system to use either a user name or an email address would probably be useful for other people. I'll give it some thought. Regards Alan Rgds Gregor - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Authenticating Users
Martin Gainty wrote: Which specific attributes are you seeking that are not in DataSourceRealm? Realm className=org.apache.catalina.realm.DataSourceRealm debug=99 dataSourceName=jdbc/authority userTable=users userNameCol=user_name userCredCol=user_pass userRoleTable=user_roles roleNameCol=role_name/ http://tomcat.apache.org/tomcat-5.5-doc/realm-howto.html#DataSourceRealm ? To summarize I (or,actually my marketing dept') have the following requirements. 1. password be case insensitive [I may be able to talk them out of this] 2. username be case insensitive. 3. email address can be used as a synonym for the user name. 4. Security managed by Tomcat CMS. Mark T suggested that I modify DSR appropriately. Chris Schultz pointed out correctly that it gets a bit more complicated if the pwd must be hashed. I've looked at the code to DSR and it seems to me that the following would work. 1. add an 'alternative' userNameCol (eg altNameCol) and in the configuration as above point that at the email column. 2. in the code, IF the login fails using the 'user_name' then try it with the altNameCol. 3. to make things case insenstive simply convert the username to lower case and use a 'lower' function on the column value. 4. to make the thing a bit more flexible an additional boolean parameter 'isCaseInsensitive' could be added to select the behavior has in 3. above. Defaults could be chosen such that the current configuration setup still works (eg the default value for isCaseInsensitive is false) Only real gotcha that I can see for making it database independent is that the function used to create lower case is not univerally 'lower()' (M/SQL appears to be toLower()) so it might be necessary to pass the string for the function name as an optional configuration parameter. I realize that many people would advise against the idea of case insensitive passwords - however, despite my personal reservations I am willing to accept that in the case of this particular application the reduction in security is acceptable. If hashed pwds are used then there are 3 solutions: 1. don't allow case insensitive passwords - only user names. 2. provide two columns one for lower case versions of the pwd. 3. convert all the existing password HASHES to the lower case equivalent, but hashed passwords are not my principal concern I've downloaded and built 6.0.18 and looked at the DSR code - doesn't look like a very big job to make the changes that I want so I may have go tomorrow. As I use 6.0.18 I can easily test it by just patching in the .class file for DataSourceRealm on my dev. system. Regards Alan - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Authenticating Users
Hi We have a site which has users log in to create/edit account information. Nothing unusual there. Currently this is implemented with a JDBCRealm and it all works OK. However, we have a 'marketing requirement' to remove case sensitivity (but NOT case preservation) from user names and passwords. I cannot see anyway to do this directly with JDBCRealm or DataSourceRealm. Unless I'm missing something, the username and password provided to j_securitycheck are explicitly matched for case. Additionally, we will shortly need to offer an alternative login mechanism - using either a login name or an email address in the same field. So far, I can see the following options: 1. Implement a filter that 'sits around' the login form and translates case on password and username to lower case and create a lowercase 'shadow' password table in my database. So, when a request is received for the 'secured' pages this would be fed through this filter. However, I don't think this will work, because I suspect that the security check is run BEFORE any filters that I have configured in web.xml. 2. Implement some java script to convert entered fields to lower case on the login form (GHASTLY!) Still doesn't fix the password thing. 3. Implement my own Realm - intercept the requests - identify the supplied string in the username field as an email address (or not), look up the user by email address in the database (which in my case must be unique). As I use PostgreSQL I can then write a 'like' query to case insensitively find matching user and password. Upside - it should work. Downside - I then have to add the resulting jar to $TOMCAT_HOME/lib on all my servers and update the MBean descriptor (which I don't completely understand how to do - advice?) 4. Possibly do something similar to 3 but with a JAAS. Does anyone have any suggestions or comments? I'm perfectly OK with using Acegi - my only issue with that after a browse through the docs I don't see how I can meet my requirement of username/email and password case insensitive but case preserving without additional code for Acegi either. Obviously I can take that issue to the acegi/spring forums if acegi is the only solution (that is 1, 3, and 4. above won't work - 2. is out) Thanks in advance Alan Chaney - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Authenticating Users
Mark Thomas wrote: 5. Patch DataSourceRealm (should just be a couple of changes to make the checks case insensitive) and deploy your patched version to each of your Tomcat instances. To do this you'd put your DataSourceRealm.class file in CATALINA_HOME/lib/org/apache/catalina/realm 6. Make case sensitivity configurable and contribute your patch back to the ASF. Providing it is database neutral, there is a good chance it will be accepted for Tomcat 7 and maybe back-ported to Tomcat 6. Mark Ok Mark I'll have a go at 5. and 6. I'll report back in a few days. Regards Alan Chaney - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: [OT] Apache Tom Cat in a VM as VMWARE or Red Hat Virtualization
Christopher Schultz wrote: Isn't xen basically dead? Or have rumors about its demise been greatly exaggerated? I thought everyone was moving to kvm. Tell that to Citrix? They made revenues of about $620M last year almost entirely based on Xen technology. Still only a fraction of VMWare's t/o, though. ($1,9B) Alan Chaney - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Apache Tom Cat in a VM as VMWARE or Red Hat Virtualization
I agree with Jorge - I run several Tomcats under VMware for both production and development. However it is worth noting that if you use the appropriate vmware tools for your installation (vmware-guestd etc.) you get a significant performance boost on network accesses which may well be important for tomcat. (See vmxnet) YMMV. Regards Alan Chaney Jorge Medina wrote: There are no issues on running Tomcat in a VM. Tomcat is unaware of where it is running. Performance depends on the host running your VM. If you compare a VM running application A on host H compared to application A running directly on host H, you will notice that running on the real server is faster. This is true for any application, not just Tomcat. -Original Message- From: acacio costa [mailto:acaciofco...@yahoo.com.br] Sent: Wednesday, February 18, 2009 2:33 PM To: users@tomcat.apache.org Subject: Apache Tom Cat in a VM as VMWARE or Red Hat Virtualization Hi, Does anyone use Apache Tom Cat in a VM as VMWARE or Red Hat Virtualization? i apreciate to know if you have issues and a tips to go on. Other things to know, Performance comparative with a real server? as the same? better? What the parameters you perceive as better than other environment and what cause as you move Tom Cat to VM. Thanks in advance, Acacio Costa Veja quais são os assuntos do momento no Yahoo! +Buscados http://br.maisbuscados.yahoo.com - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org !DSPAM:499c67d762582136417547! - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: [OT] of the different methods to get a user-id
Chris, I offer my opinions here as a real grey beard (literally). I certainly agree with you that people should have a breath of skills allowing them to use the right tool at the right time. However, notwithstanding the fact that the other day I worked out that I have actually used about 15 different programming languages in anger (that is, part of code used by other people) I have to admit that my occasional brush with Perl has been unrewarding (for both me and the language...) My biggest problem is that I've never seen a little bit of typing as a big issue, but reading and trying to understand something a few weeks/months/years later is always fraught with difficulties. The main problem with perl is that I can never remember exactly what #...@!$% means whereas something like getUserPrincipal() works for me! Regards Alan Chaney Christopher Schultz wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 André, What the hell.. let's start a holy war?! On 2/13/2009 10:25 AM, André Warnier wrote: Their merit is all the greater since they work in the obscure non-graphical background, they never get any of the attention, and they have to share machines with some Java programs, which means they get only the usage of a tiny fraction of the RAM and CPU cycles, although they do most of the real work and have to do it with a single thread each. Hear, hear! Even some of the old-school programmers, mostly in their later years, succumb to the what-the-heck syndrome and come to appreciate the sense of security and comfort provided by strongly-typed and rigidly object-oriented languages Heck, lots of folks on this list won't even use cron to schedule jobs. Instead, they write web applications wrapped around Quartz because it's just easier to deploy or some other such nonsense. IMHO, you either have control of your production environment yourself (and can do whatever you want) or you have an ops team with complete control of your production environment (and they ought to be able to handle scary stuff like scheduling cron jobs and running shell scripts) or you have no control whatsoever and therefore do not have a production environment. There, I said it. :p On the other hand, seeing object-oriented perl really makes me queasy. - -chris -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.9 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAkmZ2FIACgkQ9CaO5/Lv0PDOQgCeJno3T9D2GnoWpTFswcvInUCn zpcAnijMpytndgIfPe6knYmum47WOj56 =QFoD -END PGP SIGNATURE- - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org !DSPAM:4999da4713771562881678! - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Tomcat Internal Buffering with Jython
Hi Prashant The first question - which version of Tomcat? What operating sytem? What JVM? and in your case which version of Jython? Secondly please could you clarify exactly how your web is structured? My understanding from your first email is: 1. servlet is called with request containing a file (presumably mutlipart encoded?) 2. the file data is then fed into a python script running either using a java6 ScriptManager or similar. 3. and then what? Are you streaming the output from that file straigth into the PrintWriter/OutputStream of the HttpServeltResponse? Or are you trying to save the file locally? Regards Alan Chaney Prashant Golash wrote: Hi Tomcat-Apache Gurus, I have a web application where from the front end user loads a file and gives it as input to Java classes.The file is given as input to a python script which converts it into some other format. Here I have used the concept of jython. The file is converting properly in the parent directory of Tomat but with some of the data which is missed.The problem is when I close the tomcat,then additional data is added to the converted file which completes the correct conversion. I want to know whether some internal buffer of Tomcat is holding the extra data. If so how to retrieve it. Sincerely, Prashant golash !DSPAM:4997ebf763341804284693! - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Tomcat Internal Buffering with Jython
Hi Prashant So the exact problem is that after your jsp page is called and the data processed then the file is incomplete? Presumably then you are using ordinary file I/O to write to this file? If that's the case, then I think the answer to your original question is No - no internal buffer of tomcat is holding the data Tomcat's buffering is connected with processing servlet request/responses and it doesn't seem that you are using the response object to write your data to the output stream. I assume that you have checked that all of the data is being read from the request by some logging or debugging? I would suspect that a file or stream is not being flushed/closed and that when tomcat is stopped this flushing is happening because the streams are being closed automatically. Maybe you can create some unit tests which can help isolate this problem. It may be either in your file writing code or in the way you are using the jython libraries. Without seeing your code in detail its difficult to be more helpful. I'd guess that you could take your core logic and replicate the problem independently of tomcat. One other point is that saving this file in the tomcat home directory doesn't seem particularly elegant. You could use the default work directory. I doubt that has any relevance to the problem HTH Alan Prashant Golash wrote: Hi Alan, Below are the details for the versions and OS: Tomcat Version : 6.0 OS : Windows XP JVM : 1.6 The way web is structured is: I have some precompiled python scripts which are actually compiled by jython into java classes(Before deploying). I have one python script which uses these precompiled python classes.Now I am giving one file as input to this python script and it internally produces the output file using this input file. This output file is saved locally in the parent directory of Tomcat. There is one jsp page which takes input from the user and then passes the request to Java class which actually calls this Python script. Note:The python script is actually called using the PythonInterpreter class and all those Java and Jython integration techniques. Sincerely, Prashant golash On Sun, Feb 15, 2009 at 10:02 PM, Alan Chaney a...@compulsivecreative.comwrote: Hi Prashant The first question - which version of Tomcat? What operating sytem? What JVM? and in your case which version of Jython? Secondly please could you clarify exactly how your web is structured? My understanding from your first email is: 1. servlet is called with request containing a file (presumably mutlipart encoded?) 2. the file data is then fed into a python script running either using a java6 ScriptManager or similar. 3. and then what? Are you streaming the output from that file straigth into the PrintWriter/OutputStream of the HttpServeltResponse? Or are you trying to save the file locally? Regards Alan Chaney Prashant Golash wrote: Hi Tomcat-Apache Gurus, I have a web application where from the front end user loads a file and gives it as input to Java classes.The file is given as input to a python script which converts it into some other format. Here I have used the concept of jython. The file is converting properly in the parent directory of Tomat but with some of the data which is missed.The problem is when I close the tomcat,then additional data is added to the converted file which completes the correct conversion. I want to know whether some internal buffer of Tomcat is holding the extra data. If so how to retrieve it. Sincerely, Prashant golash - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org !DSPAM:49984b33117283966023671! - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: starting and stoppping tomcat
I think you need to rethink your use cases here... Exactly WHY do you need to start and stop tomcat from a button on a web page? Or do you really need to enable/disable some kind of function? Generally speaking servers don't expect to be started or stopped by their clients - well, ok, sometimes you can stop a service by a client but almost by definition you can't start a service from a client... Typically tomcat provides a way of processing requests received from remote web clients and arranges for the requests to be processed by a web application. Your application may have state which can be controlled by the request. This shouldn't normally affect tomcat's normal operation. HTH Alan Chaney paybackorfail wrote: That's a good point, what if it was just an html page? Mark Thomas-18 wrote: paybackorfail wrote: Hi, I have written a web application in netbeans using java and jsp, and i am hosting it on a server using tomcat, i need help on finding a way to start and stop the server by the user clicking a button on a jsp page, do i have to use the org.apache.catalina.ant.StartTask of the tomcat api? can anyone help? If Tomcat is stopped, how is it going to handle a user clicking on a button on a JSP page to start it? Mark - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: starting and stoppping tomcat
My earlier point was that you need to think about it in a slightly different way. Starting and stopping the server is something that is normally done rarely and anyway, you can't start something that is not already started by using it to start itself! What you should do is to add a boolean flag - a state variable to your servlet. You can set or clear this flag with your page button. Use this flag to condition your database access - so when the timer event fires, it checks the state flag and then accesses the database. Regards Alan paybackorfail wrote: Hi, thanks for replying, my application will take some data from a website and insert this data into a database and i schedule the application to do this every hour using contextlistener and timertask as a java servlet. At the moment it starts updating the database as soon as i upload the application to the server, I need a way to shutdown the server so it will stop updating the database Alan Chaney wrote: I think you need to rethink your use cases here... Exactly WHY do you need to start and stop tomcat from a button on a web page? Or do you really need to enable/disable some kind of function? Generally speaking servers don't expect to be started or stopped by their clients - well, ok, sometimes you can stop a service by a client but almost by definition you can't start a service from a client... Typically tomcat provides a way of processing requests received from remote web clients and arranges for the requests to be processed by a web application. Your application may have state which can be controlled by the request. This shouldn't normally affect tomcat's normal operation. HTH Alan Chaney paybackorfail wrote: That's a good point, what if it was just an html page? Mark Thomas-18 wrote: paybackorfail wrote: Hi, I have written a web application in netbeans using java and jsp, and i am hosting it on a server using tomcat, i need help on finding a way to start and stop the server by the user clicking a button on a jsp page, do i have to use the org.apache.catalina.ant.StartTask of the tomcat api? can anyone help? If Tomcat is stopped, how is it going to handle a user clicking on a button on a JSP page to start it? Mark - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Fun with the JVM crashing.
Hi Bill My development workstation is a 64 bit Ubuntu 8.04. I've had numerous problems with SIGSEGV crashes when I run my applications under Eclipse 3.3, but the same machine also runs the same applications from the same version(s) of tomcat (6.0.14,6.0.16 and 6.0.18) I found that what seemed to affect the thing the most was 'loading up' the JVM. My app is actually 5 different wars - I get the most problems when all of them are loaded. I found it so frustrating that I've actually procured a 2nd 64 bit machine to try to see what common factors there are. For example, I was going to see if Eclipse 3.4 was better than 3.3. I tried b4 thru b16 and it seems to have made no difference. No real answer here, just me giving you some more background data. Regards Alan Chaney Bill Davidson wrote: I've submitted this to Sun a few times. No response. I was hoping someone here might have an idea of what to look for. Tomcat 6.0.18 RedHat 5.2Server Sun JVM # # An unexpected error has been detected by Java Runtime Environment: # # SIGSEGV (0xb) at pc=0x2b68e6a1db57, pid=10229, tid=1103006016 # # Java VM: Java HotSpot(TM) 64-Bit Server VM (11.0-b16 mixed mode linux-amd64) # Problematic frame: # V [libjvm.so+0x564b57] # # If you would like to submit a bug report, please visit: # http://java.sun.com/webapps/bugreport/crash.jsp # The crash happened outside the Java Virtual Machine in native code. # See problematic frame for where to report the bug. # --- T H R E A D --- Current thread (0x4bfe5c00): JavaThread CompilerThread0 daemon [_thread_in_native, id=10244, stack(0x41ae8000,0x41be9000)] siginfo:si_signo=SIGSEGV: si_errno=0, si_code=1 (SEGV_MAPERR), si_addr=0x . Current CompileTask: C2:2525 com.myCompany.servlets.sales.blah.some.method(Lcom/myCompany/servlets/someClass;Lcom/myCompany/servlets/otherClass;Lcom/oreilly/servlet/ParameterParser;)V (425 bytes) .. - I'm wondering if that CompileTask is what's causing the problem. I'm thinking that the JVM shouldn't be getting SIGSEGV's. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org !DSPAM:498b962676632009820482! - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: PostgreSQL vs MySQL with Tomcat
I stopped using MySQL when it was at version 4 because the transactional locking table (InnoDB) had different licensing restrictions than the rest of MySql (I'm not sure if this is true any longer.) We switched to Postgresql (of comparable price!) and basically found it well-documented, reliable and fast (as long as you make sure to 'vacuum' it) Postgresql is under the BSD license which suited our needs better than the dual-licensing arrangement of MySQL. PGSQL has a very comprehensive set of features and I've not had any problems using it in conjunction with Hibernate. MySQL 5 now has better transactional support than 4 - although I am personally sceptical of their reliance on 'atomic' locking - I don't quite see how that would work with long transactions and an optimistic locking strategy. So, in the end you pays your money and you takes your choice (grin) Alan Chaney Terence M. Bandoian wrote: I don't have a great deal of experience with Postgres but I have been using MySQL since the days of mSQL and have found it to be fast, reliable, easy to install on both Linux and Windows and straightforward to administer. It provides good support for the ANSI standard and the documentation is good in identifying extensions to or deviations from the standard. All of the basic tools, from query analysis to command line administration programs, are documented and function reliably. Statement syntax is very well documented. Features include localization, various character sets (UTF-8 and Unicode), data encryption, client/server encryption, stored procedures, triggers, transactions, APIs for a number of programming languages and support for ODBC, JDBC and .NET. Configurability is provided mainly through some 250+ system variables which may be set at startup (on the command line or in the options file) or dynamically with the SET statement. I have been very pleased with its performance both administratively and as a programmer and you can't beat the price. -Terence M. Bandoian - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org !DSPAM:4974eae8230262136417547! - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Random Connection Closed Exceptions - Question to the code example
Hi Stefan
You don't need to repeat the stmt.close();conn.close() etc in the 'try'
body. The 'finally' by definition is ALWAYS called and that is where you
should do the tidy up...
Alan Chaney
Stefan Riegel wrote:
I guess I understood the point with the Random Connection Closed
Exceptions Problem.
See at the end of
http://tomcat.apache.org/tomcat-6.0-doc/jndi-datasource-examples-howto.html
As I understand, only the connection itself must be protected this way.
The statement and ResultSet must not. Is the following, simplified code
also correct?
Connection conn = null;
Statement stmt = null;
ResultSet rs = null;
try {
conn = ... get connection from connection pool ...
stmt = conn.createStatement(select ...);
rs = stmt.executeQuery();
... iterate through the result set ...
// SUPERFLUsOUS
rs.close();
stmt.close();
conn.close(); // Return to connection pool
conn = null; // Make sure we don't close it twice
//SUPERFLUOUS
} catch (SQLException e) {
... deal with errors ...
} finally {
try {
rs.close();
} catch (SQLException e) {
// deal with errors
}
try {
stmt.close();
} catch (SQLException e) {
// deal with errors
}
if (conn != null) {
try {
conn.close();
} catch (SQLException e) {
// deal with errors
}
conn = null;
}
}
Thanks.
-
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Re: Random Connection Closed Exceptions - Question to the code example
Hi Stefan
I went and read the comments more carefully and it seems to me that the
proposed solution is an attempt to avoid a race condition between
issuing the 'close' in
one thread and then it being closed again whilst its being used in
another thread.
If the problem is closing it twice then I can't see why its not just
closed in the 'finally' block, once for each thread.
If it is a concurrency problem then I suspect that the proposed solution
in the docs isn't the right one anyway. I'd suspect that the problem is
more to do with threads not seeing each others memory state properly.
Isn't this is a case of a variable (in this case 'conn') actually being
a reference to an object which is shared between threads?
Because of the JVM memory model it is possible for two threads not to be
properly synchronized - see Doug Lea et.al and 'happens before' .
Personally, I feel that the correct solution is to synchronize access
to the connection object when it is retrieved and closed.
I have to go out now and I don't have any more time to consider this
today, but I'd be interested to hear other people's comments on this topic.
Regards
Alan Chaney
Stefan Riegel wrote:
Thanks Alan, just to make the thing really clear. You propose code
like this:
public void execute() {
Connection conn = null;
Statement stmt = null;
ResultSet rs = null;
Context envContext = null;
try {
Context initContext = new InitialContext();
envContext = (Context) initContext.lookup(java:/comp/env);
DataSource ds = (DataSource) envContext.lookup(jdbc/swex);
conn = ds.getConnection();
stmt = conn.createStatement();
rs = stmt.executeQuery(some sql);
// iterate through the result set ...
} catch (SQLException e) {
e.printStackTrace();
} catch (NamingException e) {
e.printStackTrace();
} finally {
if (rs != null) {
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (stmt != null) {
try {
stmt.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (conn != null) {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (envContext != null) {
try {
envContext.close();
} catch (NamingException e) {
e.printStackTrace();
}
}
}
For me this looks fine but I'm still confused, why they complicated
things in the example of properly written code
http://tomcat.apache.org/tomcat-6.0-doc/jndi-datasource-examples-howto.html?
Hmm... frankly the code in the docs you refer to above seems odd to
me... why repeat in the 'finally' something you've done in the 'try'?
I can see that setting the variables to null would ensure that all
references were released and the objects were made candidates for garbage
collection but that could be done in the finally block anyway at some
convenient point.
Obviously in your code you might not want to obtain and release the
context for every JDBC operation - that would probably be done in some
kind of start-up/shutdown code for your app, and of course your
exception handling may need some more work depending upon the way you
want to present the error
to your users, but I assumed that the issue you are concerned with is
preventing resource leaks.
Any comments anyone else?
Regards
Alan
Do I miss some important point here?
Stefan
Alan Chaney schrieb:
Hi Stefan
You don't need to repeat the stmt.close();conn.close() etc in the
'try' body. The 'finally' by definition is ALWAYS called and that is
where you should do the tidy up...
Alan Chaney
Stefan Riegel wrote:
I guess I understood the point with the Random Connection Closed
Exceptions Problem.
See at the end of
http://tomcat.apache.org/tomcat-6.0-doc/jndi-datasource-examples-howto.html
As I understand, only the connection itself must be protected this
way. The statement and ResultSet must not. Is the following,
simplified code also correct?
Connection conn = null;
Statement stmt = null;
ResultSet rs = null;
try {
conn = ... get connection from connection pool ...
stmt = conn.createStatement(select ...);
rs = stmt.executeQuery();
... iterate through the result set ...
// SUPERFLUsOUS
rs.close();
stmt.close();
conn.close(); // Return to connection pool
conn = null; // Make sure we don't close it twice
//SUPERFLUOUS
} catch (SQLException e) {
... deal with errors ...
} finally {
try
Re: Tomcat Beginner - Step 2!
Toriacht Eclipse wst has a number of dfferent ways of working. It looks like you have selected the (default) way in which eclipse creates its own internal copy of the webapps directory - in your case in the folder E:\\ ..\tmp1\service_demo. What the error is saying is that as tomcat starts it can't find the doc base. This is most likely for the following two reasons: 1. the directory really isn't writeable 2. more likely, you've managed to get eclipse out of sync with your project. I suggest that you try the following: Find the 'Server' tab (normally in one of the bottom panes) Find the tomcat server - right click on in and select 'Clean' and then 'Refresh' This will rebuild the internal copy. Try starting it again. If this still doesn't work, then please provide the following: The FULL startup display from the 'console' pane Your web.xml Thanks Alan Toriacht wrote: Thanks guys... I'm not sure if the following is an Eclipse or Tomcat issue. I have a simple webservices demo written from tuorial. It appeared that teh server was started up thru server staus window of eclips..console o/p etc but it never appeared in task manager or the tomcat was not accessable thru a browser. On closer inspection I found the following error..this happens when i try to start the server thru eclipse.. SEVERE: Error starting static Resources java.lang.IllegalArgumentException: Document base C:\Documents and Settings\Brian\workspace\ganymede\.metadata\.plugins\org.eclipse.wst.server.core\tmp1\wtpwebapps\service_demo does not exist or is not a readable directory at org.apache.naming.resources.FileDirContext.setDocBase(FileDirContext.java:141) Any ideas? T p.s. I have another thread on web services that ended up asking the same qn as above. although it started out as a more generic question. I hope this not against policy. I'll delete other thread if required. Caldarale, Charles R wrote: From: g f [mailto:gfo...@gmail.com] Subject: Re: Tomcat Beginner - Step 2! Change your port forwarding(virtual server) to forward port 80 (on the outside) to port 8080 on the inside. If your router/modem doesn't support port forwarding, change the Connector port in conf/server.xml to use 80 rather than 8080. You must restart Tomcat whenever you make changes to the server.xml file. - Chuck THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY MATERIAL and is thus for use only by the intended recipient. If you received this in error, please contact the sender and delete the e-mail and its attachments from all computers. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: File upload fails
How big is the file? Connection reset is commonly caused by the the client dropping the connection. This could be because of connectivity problems - for example, issues with the clients ISP. I have had problems with specific browsers over this as well (our site has dozens of large mpeg and jpeg uploads each day). The worst culprit proved to be Safari 3 on a Mac. Is the upload done with SSL? I doubt that restarting the server makes any difference one way or the other. Why not get the client to test with a non-urgent file and a non-urgent time when you have a chance to fault-find? Also, you may want to watch the upload with something like wireshark to see exactly what is happening and when. Regards Alan Chaney javacle wrote: pWe have a customer who uploads a file on a daily basis. Usually it works, but about once every two weeks it fails with this error in the log : porg.apache.commons.fileupload.FileUploadException: Processing of multipart/form-data request failed. Connection reset pAfter restarting tomcat, sometimes three times, it eventually works. Whether the restarting is significant or just the passage of time that clears some other fault I dont know .. there is always a panic to get it working pThe customer is on the other side of the continent, but today she emailed the file to me and I had the same error trying to upload her file from the office the first time (i.e. same building as server). So that would seem to eliminate long-distance network latency/timeout as a factor. pNothing I am aware of has changed since the last time it worked, however something may have changed in the network, or on the server, without being noticed. Any advice would be appreciated tomcat 5.5, jre 1.4.2, Red Hat Enterprise Linux ES release 4 (Nahant) Kernel 2.6.9-5.ELsmp on an i686 - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: File upload fails
javacle wrote: The file is about 30Mbytes .. I get the same error uploading from the office on the same LAN as the server. Ok - not likely to be a problem with the remote connection, then. What do you see in your browser when the upload fails? Have you got any browser debugging - if you are using Firefox you can easily add the 'LiveHttpHeaders' plugin which I find very useful. What happens inside your application following the upload? Is there a significant period of processing in the same thread as the servlet doGet? If so, its possible that your connection is timing out. As you can simulate the problem in your office, what happens if you DON'T restart tomcat after you get the connection issue? If you just leave it for a little while can you then upload again? Browser is (I think) always MSIE 6 .. but maybe sometimes Mozilla .. that's something to check. I will look into wireshark. Having a monitor on the connection will be useful. You should be able to install wireshark from your distro. I assume that as you are using MSIE then your dev. system is a PC? I develop on linux and don't know of any particular network monitor to recommend. HTH Alan Alan Chaney wrote: How big is the file? Connection reset is commonly caused by the the client dropping the connection. This could be because of connectivity problems - for example, issues with the clients ISP. I have had problems with specific browsers over this as well (our site has dozens of large mpeg and jpeg uploads each day). The worst culprit proved to be Safari 3 on a Mac. Is the upload done with SSL? I doubt that restarting the server makes any difference one way or the other. Why not get the client to test with a non-urgent file and a non-urgent time when you have a chance to fault-find? Also, you may want to watch the upload with something like wireshark to see exactly what is happening and when. Regards Alan Chaney javacle wrote: pWe have a customer who uploads a file on a daily basis. Usually it works, but about once every two weeks it fails with this error in the log : porg.apache.commons.fileupload.FileUploadException: Processing of multipart/form-data request failed. Connection reset pAfter restarting tomcat, sometimes three times, it eventually works. Whether the restarting is significant or just the passage of time that clears some other fault I dont know .. there is always a panic to get it working pThe customer is on the other side of the continent, but today she emailed the file to me and I had the same error trying to upload her file from the office the first time (i.e. same building as server). So that would seem to eliminate long-distance network latency/timeout as a factor. pNothing I am aware of has changed since the last time it worked, however something may have changed in the network, or on the server, without being noticed. Any advice would be appreciated tomcat 5.5, jre 1.4.2, Red Hat Enterprise Linux ES release 4 (Nahant) Kernel 2.6.9-5.ELsmp on an i686 - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Retrieve User Role
Hi Ben
You can get it from the request. In JSP you can access the request
implict object to get the value of the
HttpServletRequest#getRemoteUser() method ...
Returns the login of the user making this request, if the user has been
authenticated, or null if the user has not been authenticated.
(quote from j2ee docs for HttpServletRequest)
The exact syntax to use depends upon whether or not you are using EL.
If you are using tags..
% String username = request.getRemoteUser() %
and in EL you can use the 'pageContext'. Try:
${pageContext.request.remoteUser} /// I think... you may need to check.
and use as you see fit...
Alan
Ben Tomlinson wrote:
I have set up login security for some of the pages in my website. I
have a JDBCRealm setup and working correctly. But now I want to
change the layout of my pages (all jsp pages) according to the user
that is logged in. How do I retrieve information about the user that
is actually logged in? Mainly I want the user role or the user name
but I can't seem to get it from the session. Any help would be
appreciated.
Ben
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Re: Single WAR to update multiple contexts
Sean Wouldn't it be easier to have ONE webapp and determine the database from, for example, the URL its invoked with? Its a little difficult to know exactly how you are doing things but instead of having /ctx1 /ctx2 /ctx3 and mapping each one to ctx1.war why not have a filter in your setup which determines that its invoked with /ctx1 and passes a parameter to the actual servlet which selects the database you require? You could have one web app as ROOT and do it that way. Maybe you could explain further why you need 200 separate versions where the only difference is the name of the database? Regards Alan Chaney Sean W wrote: Greetings! I have a single war packaged application that needs to have about 200 unique context paths running (200 copies of the application running - each uses a different database based on the context name). I know how to deploy 1 context at a time, but how can I do this so that if I want to update all these contexts to the next version, I can update them all at the same time easily? Any suggests are much appreciated. Thanks! -Sean W - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Hints on upgrading from 6.0.14 to 6.0.18 on production server
Hi
I have a 6.0.14 running with Apr 1.1.10 and I seem to be seeing
instances of CVE-2007-6286: Tomcat duplicate request processing
vulnerability
(64-Bit Server VM (build 1.6.0_03-b05, mixed mode)
(Centos 5.0 - Linux 2.6.18-8.el5 x86_64 )
The obvious thing to do is to upgrade from 6.0.14 to 6.0.18. Firstly,
are there any changes in server.xml and web.xml in 6.0.18 that mean I
can't just use the existing ones in the new installation.
My current installation has $TOMCAT_HOME pointing to /usr/local/tomcat
My intended upgrade sequence is:
1. opy down 6.0.18 and untar it int /usr/local/tomcat18 (after checking
signatures)
2. copy over the jars that I have placed in the old $TOMCAT_HOME/lib (eg
postgres jdbc jar) to /usr/local/tomcat18/lib
3. copy over my webapp wars from $TOMCAT_HOME/webapps to the new webapps
folder.
4. as I am using jsvc to control tomcat, copy over the 'tomcat' file
from the $TOMCAT_HOME ('tomcat' is actually a shell script which sets up
all the environment variables for jsvc.) jsvc is in
/usr/lib/tcnative/jsvc so it should be unaffected by the move. However
I do need to copy over the $TOMCAT_HOME/bin/commons-daemon.jar.
5. stop the old server and rename its directory to /usr/local/tomcat.old
6. rename the directory of the new server to that of the current the new
server.
7. restart the server.
Am I missing anything? What have I overlooked? I need this to go as
smoothly as possible as there is quite a lot of traffic on this site.
Thanks in advance
Alan Chaney
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Re: Hints on upgrading from 6.0.14 to 6.0.18 on production server
Or stop using APR... but that in itself is quite a lot of work as I'll have to reconfigure my SSL. Hmm... Gregor Schneider wrote: If I'm not mistaken, the APR has caused the bug, and 6.0.16 contains a new version of the APR. Since this usually comes as a source, you'll have to re-compile the APR. Cheers Gregor - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Sudden and unexpected exception at Tomcat startup
Hi Andre Tomcat DOES in fact rewrite the tomcat-users.xml file during startup. This has been mentioned on this list several times as being insecure but the general opinion is that you should not be using the MemoryUserDatabaseRealm in production. Actually, I found that not only does it rewrite it, but it also uses the current umask so that it is quite likely that the file will become world-readable. You should probably do what the gurus suggest and switch to a more robust realm (eg JDBC etc) Here are some suggestions you have probably already tried: What are the permissions on the /svr/www/tomcat/base/conf folder? Are you sure that the user that tomcat runs as can write to that folder? Have you checked that tomcat is running as the user that you expect? Is it possible that there is a filing system error or even a disk error? Regards Alan Chaney André Warnier wrote: Hi. Does someone have an idea of what is going as per the logfile catalina.out below ? What is this IOException all about ? This is a Tomcat 5.0.x under Suse Enterprise Linux 10.1, which had been working fine until now and suddenly logs this at startup. This Tomcat runs under an IBM JVM 1.5. Tomcat is started, as per the listening ports and the ps display I can see, but apparently the access to Tomcat (through Apache and mod_jk) does not work anymore (tells me : The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later. ) Additional info : - the directory /srv/www/tomcat5/base/conf/ is writeable by the user tomcat under which Tomcat is started. - To my knowledge, the server.xml has not been changed since the previous succesful restart 2 days ago, and neither has tomcat-users.xml server.xml (excerpts) : ... !-- Editable user database that can also be used by UserDatabaseRealm to authenticate users -- Resource name=UserDatabase auth=Container type=org.apache.catalina.UserDatabase description=User database that can be updated and saved /Resource ResourceParams name=UserDatabase parameter namefactory/name valueorg.apache.catalina.users.MemoryUserDatabaseFactory/value /parameter parameter namepathname/name valueconf/tomcat-users.xml/value /parameter /ResourceParams ... (further under Engine and Host :) Realm className=org.apache.catalina.realm.UserDatabaseRealm debug=0 resourceName=UserDatabase/ ... catalina.out : 2008-12-28 13:21:58,543 [main] INFO org.apache.catalina.core.StandardService - Starting service Catalina 2008-12-28 13:21:58,545 [main] INFO org.apache.catalina.core.StandardEngine - Starting Servlet Engine: Apache Tomcat/5.0 2008-12-28 13:21:58,548 [main] WARN org.apache.naming.NamingContext - Unexpected exception resolving reference java.io.IOException: IOException writing to /srv/www/tomcat5/base/conf/tomcat-users.xml.new at org.apache.catalina.users.MemoryUserDatabase.save(MemoryUserDatabase.java:495) at org.apache.catalina.users.MemoryUserDatabaseFactory.getObjectInstance(MemoryUserDatabaseFactory.java:98) at org.apache.naming.factory.ResourceFactory.getObjectInstance(ResourceFactory.java:129) at javax.naming.spi.NamingManager.getObjectInstance(NamingManager.java:316) at org.apache.naming.NamingContext.lookup(NamingContext.java:791) at org.apache.naming.NamingContext.lookup(NamingContext.java:151) at org.apache.catalina.realm.UserDatabaseRealm.start(UserDatabaseRealm.java:252) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1075) at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:478) at org.apache.catalina.core.StandardService.start(StandardService.java:480) at org.apache.catalina.core.StandardServer.start(StandardServer.java:2313) at org.apache.catalina.startup.Catalina.start(Catalina.java:556) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:79) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:618) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:287) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:425) javax.naming.NamingException: IOException writing to /srv/www/tomcat5/base/conf/tomcat-users.xml.new at org.apache.naming.NamingContext.lookup(NamingContext.java:803) at org.apache.naming.NamingContext.lookup(NamingContext.java:151) at org.apache.catalina.realm.UserDatabaseRealm.start(UserDatabaseRealm.java:252) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1075) at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:478) at org.apache.catalina.core.StandardService.start
Re: Setting /WebContent as ROOT for an application
In Eclipse, assuming you have the WTP tools installed, you create a 'Dynamic Web Project.' This has a folder structure of which the essence is: MyApp src com mypackage Abc.java build com mypackage Abc.class WebContent index.html (or jsp or whatever) WEB-INF web.xml lib a.jar b.jar In the above com.mypackage.Abc.java is your web application, and a.jar and b.jar are any runtime libraries that application requires (NOT stuff already in $TOMCAT_HOME/lib) When you compile and run applications within eclipse it copies the WebContent structure to the webapps directory of its (internal) tomcat, and in WEB-INF creates a folder called classes and copies the contents of the 'build' folder their. This normally happens automatically every time you start the server inside eclipse. When you want to deploy the project to an external instance of tomcat (eg a production server) you right-click on the Export.. option in the project context menu and then select WAR (there's a suprise). The war file by default has the project name (in the above expample MyApp.war. This should be copied to the webapps folder of the tomcat instance and if you've stuck to the normal server.xml configuration it should deploy. It will be available at http://the.tomcat.instance:8080/MyApp/index.html (or jspt or whatever) This is an incredibly brief summary of what is undoubtedly an obscure and complex process for the new-comer (been there.. done that...) and which sadly is not especially well EXPLAINED anywhere that I have found. There are some 'cookbook' type recipes on the web, which are often inconsitent. Hope that helps Alan Chaney (a daily eclipse user, but hardly an eclipse guru...) Markus Schönhaber wrote: Tom Blank: The reason why I'm asking is, because I'm using eclipse and its 'dynamic web project' structure. I'm no Eclipse user either, but AFAIR the folder Webapps is part of an Eclipse Dynamic Web Project. And a project folder is not meant to be simply copied to Tomcat's appBase (judging from your OP, it seems to me that's what you've been doing). You could, for example, export your project to a WAR file and deploy this. Experienced Eclipse users may know of other/better ways of deployment. You might consider asking in the appropriate Eclipse mailinglist/newsgroup. Regards mks - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org !DSPAM:4943f4d3100632009820482! - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Session replication for JPetStore application in tomcat 6
Anupam I think this is probably your problem. You create and save information in one node and then look to see if it is in the other node. It will only be there if you are independently synchronizing the database state, because, as you said in your previous emails, they are independent. The database state is nothing to do with the http session, you must manage that separately. 2) Is it necessary to make the petstore database on each of nodes clustered for session replication to happen ? Regards Alan Chaney - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Tomcat threads
André André Warnier wrote: (and what is PermGen ?) No one else seemed to answer this. PermGen is the chunk of memory which is allocated to the JVM in which to hold the 'prototypes' of the class files used. For a large web app with lots of classes (NOT object) it is common to have to radically increase this over the default (which, from memory, is 64M, to 192M or even 256M to taste.) It is possible to write a Java web application in such a way that during application reload some of the PermGen is not released. This is what we call a 'bug' but it can be difficult and frustrating to locate. Try Googling -XX:MaxPermSize for more details. Regards Alan - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Tomcat Master for PHP Hosting?
Its called a 'web service'. Make your tomcat application a web service. Use a php application to invoke it. Distribute the php applications to the php servers. The php application has a user interface and generates the invocation request (probably as an xml file). Your 'MASTER' does the business logic and generates a reply, either as an xml file which you can use XSLT in php to render or some other form. If you really wanted to get sophisticated you could write a tomcat application that generated most/all of the php against some specification and style the displayed pages with css. There are, of course, numerous standards and implementations for web services. You could also make it an AJAX app if you wanted to. HTH Alan Johnny Kewl wrote: Does anyone know if there is anything like this already... What I need (want to do) is turn TC into a Virtual PHP hosting system... This is the idea... one can layout a html/PHP site in tomcat... Then point that at distributed servers out there, and use the remote links in JSP, servlets etc. And it just happens... ie those Virtual Sites are deployed to remote httpd servers and it all just works. Then there could be intelligent processing, like a form submitted to a remote PHP site is processed by tomcat... there will be bridges but I havnt got that all thought thru yet... Then the idea is that from the company you run TC... its the brain... but it now can take advantage of all the cheap hosting PHP sites out there... A kind of load sharing system... that can make use of dumbed down hosting sites... And one develops on tomcat as if it was all right there on your machine... The thing I'm after is making a kinda TC MASTER... I dont know what others find, but locally if I talk to hosting services and mention Tomcat... I get a Oh, that will cost more... like its rocket science or something... So I want to put tomcats brain into PHP without giving the brilliant admin dude a cranial embolism. I think intelligence can actually be made very light... and the plebs can do the heavy lifting... So in the end... the home site is the brain... running a whole worker population out there. ... Anyway thats the idea... does anyone know if there is anything like this already? ... TC as a PHP god... sort of thing. Thanks - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] !DSPAM:48db8629255436657853550! - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Server Maintenance Across Timezones (global)
Hi Bill Yes, we have the same problem and I've been working on ways to improve the situation. Unfortunately, I don't think there is an easy or simple solution - a lot will depend upon your application. As far as the database side of it goes it seems to me that much of it is a question of making the 'live-update' a design requirement for any upgrades. You have to make it possible for the changes to the database to 'co-exist' and then update the live database independently of the application. When the new tables are ready, deploy your new application and (hopefully) go home smiling. We tend to create DDL changes as SQL scripts - test them out on the development systems and then run them on the live site. Some examples make it easier to see what I mean. A 'simple' change might be just adding an extra field with a static default. Obviously easy - you just run the script, it adds the extra field, the old app. doesn't have any knowledge of it. You make sure the script correctly initializes the field. When the update app runs its there. A more complex change is where a new field is required that may need to be derived from existing data. Since this data may be changing on the fly, you have to ensure consistency. The best way I've found for this is to create an 'update' transaction in your ORM code (or whatever you are using) that detects that the DDL state has changed and then runs an ACID initialization of the new field. Once again, the testing of this update is a key part of your release testing strategy. As for tomcat itself its rather going to depend whether you run clustered or not. One method that I've used on unclustered systems is to configure the new system on a server instance on a different IP address on a system fronted by httpd, set up some redirects in httpd and just, as it were, 'hup' from the old instance to the new instance. This requires a DNS change, but any 'old' requests to the old server are redirected to the new server. After about 48 hours you should be able to shut down the old server. However, we were able to catch an 'idle' period - you may not be able to do that and you'd have to ensure that any sessions active on the old server were correctly propagated to the new server. I'd be interested to hear from people who have clustered solutions. Once again I suspect there may be problems with trying to sustain sessions across the upgrades. Regards Alan Chaney Bill Davidson wrote: My company's main webapp is used around the world (Europe, North America, Australia, etc.). We're using Tomcat as our app server and Oracle (10g) for our database. When we want to do an upgrade, that usually involves DDL changes to the database as well as corresponding changes to the webapp which means we have to make our users log out so we can shut down the app, update the DDL and restart the updated webapp. The changes are interdependent. It's all or nothing. This was not a big problem when we were just doing business in the U.S. We'd do upgrades late at night when nobody (or hardly anyone) was using the system. The problem now is that late at night here is middle of the day in other places and downtime in the middle of the day is a real problem. Our customers use our app to run parts of their business so downtime in the middle of the day is very very bad. They understandably don't like telling their customers: I'd like to help you but I need to wait for the Americans to upgrade their systems. I'm not sure how to deal with this. I've been trying to think of a way to use multiple servers and multiple databases but that seems like a synchronization nightmare. Losing data consistency is not an option. I'm sure that plenty of others on this list have had to deal with this problem. Any suggestions? How have others dealt with it? - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] !DSPAM:48d172ca19921381456296! - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Intgrate Tomcat and PHP in winxp
Radhakrishna The main issue here is that it is probably not worth doing. You would probably be better off investigating tuning apache and php. I assume that your existing installation uses mod_php? If so, the php and apache lists may be of help. httpd can be extensively tuned for memory footprint and performance. Tomcat is a java application server. The cgi access method is a convenience for working with other types of application (non-java). If you use the cgi approach you will: 1. create an entirely new process for each request (very time consuming in both memory and cpu cycles) 2. be open to more security vulnerabilities. See http://www.php.net/manual/en/security.cgi-bin.php Unless your server is serving predominantly java applications with a few PHP apps your proposed approach will be slower, not faster, and more difficult to maintain. As far as doing it 'step by step', IMHO this is an 'advanced' task and you should not be undertaking it until you fully understand all the implications for performance and security. As Tommy suggests, read and understand the documentation first. Regards Alan Chaney Radhakrishnavangara wrote: Hi Tommy, That was really informative. But let me explain you the actual scenario. I am using an application called phpESP ( a survey tool developed in PHP) and running on Apache httpd. The application is running fine, but it is consuming lot of memory space in the server. So we have decided to move the application and deploy on a lighter application server. That's the reason we have decided to deploy on Tomcat. So could you please let me know your opinion on the same. Also i am a beginner to PHP and Tomcat. Also i have spend lot of time on this and now i have to some how finish this task. Offline i will take your guidance on understanding this technology. For now could you please explain us with the step by step instruction on how to finish the same task. Regards, Radhakrishna Tommy Pham wrote: Hi Radhakrishna, --- On Sun, 8/17/08, Radhakrishnavangara [EMAIL PROTECTED] wrote: From: Radhakrishnavangara [EMAIL PROTECTED] Subject: Intgrate Tomcat and PHP in winxp To: users@tomcat.apache.org Date: Sunday, August 17, 2008, 3:24 PM Hi, Could you please let me know the step by step instructions for integrating Tomcat with PHP on Win XP. I have tried implementing various methodologies to integrate the same , but i could not achieve any breakthrough on the same. Below are some of the links to the articles which i have referred. Could you please go through the same and clarify me on this issue. http://www.windowscomputer.com/node/3814 http://www.theasolutions.com/tutorials/tomcatphp.jsp http://the-double-0-project.net/blog/?tag=tomcat http://209.85.175.104/search?q=cache:szlV41sb9qwJ:uranus.im.chu.edu.tw/~dtchang/phpexplorer/html/download.php%3Ffn%3D..%252F..%252Fpub%252F.%252Fdownload%252Fapache_tomcat%252FRunning%2Bphp%2B5.x%2Bon%2Bwindows%2Busing%2Btomcat%2B4.x%2Bor%2B5.x%2B-%2BSimple%2BThoughts%2B-%2BJava%2Band%2BWeb%2BSoftware.pdf+angusman+tomcathl=enct=clnkcd=7gl=in http://www.duminy.fr/blog/?p=22language=en Thanks and Regards, Radhakrishna -- View this message in context: http://www.nabble.com/Intgrate-Tomcat-and-PHP-in-winxp-tp19022523p19022523.html Sent from the Tomcat - User mailing list archive at Nabble.com. IMO if you want to use PHP with Tomcat, it's best you read the documentation for both products and their technology as it will help you secure the server/platform and troubleshoot any problems that may arise including application crashes and security breaches. For PHP5: http://www.php.net/manual/en/ For Tomcat6: http://tomcat.apache.org/tomcat-6.0-doc/index.html For Tomcat5.5: http://tomcat.apache.org/tomcat-5.5-doc/index.html You can just go through the installation steps w/o doing the actual installation to see what you have available. Though I haven't tried this method, I think you can run PHP as CGI in Tomcat. You'll just have to edit the web.xml in $CATALINA_HOME/conf folder and follow PHP's instruction of installing as CGI. The method I prefer and have tested to work (in Unix environment although on Windows should be similar) is running Apache HTTPD server with PHP as a mod and use the connector to connect to Tomcat. If this method is used, it's easier to implement other technologies later such Perl, Python and Mono (for .Net) inside Apache HTTPD as mod-*. But you may want to evaluate your needs and goals before choosing ;) Regards, Tommy - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Committing sendRedirect()
Tore
Your code below is written as though the 'out' was like writing data to
a console. The processing in a servlet is part of a request/response
cycle, where the 'request' tells it what to do and the response is the
reply.
Because of the nature of the request/response cycle you only get one
chance at the reply. The javadocs for HttpServletResponse.sendRedirect
make this clear.
If the response has already been committed, this method throws an
IllegalStateException. After using this method the response should be
considered to be committed and should not be written to.
In other words, in one servlet request/response cycle you get exactly
one chance to issue a 'sendRedirect'. If you think this through you'll
see that this is how it has to be:
Browser sends request to servlet
Servlet process request and sendsRedirect
Browser display response.
Your problem is that you are trying to generate a second response
without a correspondng request. The first response is for the 'top 25'
and the second is for 'all the rest', but by then you've already
committed the response.
To achieve what I think you are trying to achieve would require you to
create some mechanism where the lucene query results are processed in a
separate thread and your application makes TWO requests - one for the
first set of results and then one for the final set of results.
There are far too many different ways to do this to detail here - I hope
this helps
Regards
Alan Chaney
Tore Eriksson wrote:
Hi everybody,
I have a problem with redirects in Tomcat 5.5.25. I am doing a Lucene
search and would like to send a redirect after finding the top 25 hits,
commit this response, and then continue processing the remaining hits.
The relevant parts of the doPost() code are as below:
final int PARTIAL_HITS = 25;
for (int i = 0; i hits.length(); i++) {
Document doc = hits.doc(i);
String citation = doc.get(citation);
/** Insert into table */
try {
insertId.setInt(1, java.lang.Integer.parseInt(citation));
insertId.executeUpdate();
}
catch (SQLException e) {
out.sendError(500, Bad SQL insert: + e);
}
catch (Exception e) {}
if (i == PARTIAL_HITS) {
// Intermittant redirect
out.sendRedirect(resultUrl);
}
}
insertId.close();
if (!out.isCommitted()) {
// Final redirect
out.sendRedirect(resultUrl);
}
My problem is that the intermittant redirect is not committed until the
function returns, which will take quite some time for some queries. I
have tried HttpServletResponse.flushBuffer() and other possible
variations. Any pointers would be most appreciated.
Tore
___
Tore Eriksson [tore.eriksson ad po.rd.taisho.co.jp]
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Re: The type . . . is not visible
Er... shouldn't you be making K00, GenK00 and its constructor public?
They will only be visible to classes in .../test/k00
As to tc loading generic classes - works fine for me on Java 5 and Java 6
Regards
Alan
Albretch Mueller wrote:
Hi
I need to check if the tc classloaders are able to load/reload generic classes.
So I created two sample classes in /webapps/ROOT/WEB-INF/classes/test/k00:
package test.k00;
class K00{
public int i0;
public long l0;
}
and
package test.k00;
import java.util.*;
// __
class GenK00{
private String aS;
public ArrayListK00 ALK00;
// __
GenK00(String aS){
this.aS = aS;
ALK00 = new ArrayListK00();
}
}
which as you can see are in package test.k00
Then I simply rearrange the welcome-file-list so that index.jsp is
loaded first and included some test code right before theline If
you're seeing this page ...
p
Loading Generic classes:br/
[EMAIL PROTECTED] import=test.k00.*%
%
K00 k0 = new K00();
k0.i0 = 0;
k0.l0 = 0L;
%
/p
However I am getting The type K00 is not visible kinds of errors
How can I fix this error and make tc load the classes?
Once the classes are loaded, would tc reload them if K00 is changed to, say:
class K00{
public int i0;
public String aS0;
}
after you recompile it, or if a new class is dropped in this
directory, would tc load it?
Thanks
lbrtchx
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Re: The type . . . is not visible
Chris Actually if you look at the link the OP provided you can see where he was coming from/ going to... (sort of) http://groups.google.com/group/comp.lang.java.programmer/browse_thread/thread/d739a953735e0beb/62a82237e403ab76?lnk=raot He seems to be doing an experiment to try and do something that is much more easily done in many other ways. I think from reading the comments on the list he is a little confused as to what 'generics' actually are in Java. I think the tomcat aspect of it appears to be that he thinks that tomcat can't handle 'generic' classes. I don't know why. Albrecht Is your background in C++? You appear to be considering that generics are similar to templates in C++. They are not. They are simply a compile time convention in Java 5 and later to improve java's handling of typing when using classes in a polymorphic way. As mentioned in the thread as above, compiled bytecode has no knowledge of the original generics. For further information I suggest that you read the Java Language Specification and the Java Virtual Machine spec both available on the Sun website. The JSP compiler in tomcat 5.5 and later supports generic classes because it supports Java 5. Regards Alan Christopher Schultz wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Alan, Alan Chaney wrote: | Er... shouldn't you be making K00, GenK00 and its constructor public? ...and maybe also importing them into the JSP? JSPs are not in a package -- at least not a predictable one, so you need to import your classes using the @page import=... @ directive. - -chris -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.9 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAkg3IdgACgkQ9CaO5/Lv0PC6BgCfdoyd7YnCXxbTUdYbX6nZSB9P DCkAmwUrSFpt/gtrKeHUgD6DftRvATs5 =wkSp -END PGP SIGNATURE- - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] !DSPAM:483722cc60361572928584! - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: How to increase tomcat memory
You seem to be using linux. If you go: ps alx | grep java after you have started tomcat you should be able to find the invocation for tomcat. Please check to see whether or not the options you have specified below appear in that list and check very carefully that there is whitespace around the options. I would look for two things were I debugging this: 1. The option isn't being included in the tomcat java invocation 2. The option is corrupted (misspelt, incorrect spacing etc). HTH Alan Chaney Tomás Tormo wrote: Hi here it comes my question again... :D How to increase tomcat memory? I'm getting GC overhead limit exceeded. I tried putting export JAVA_OPTS=-Xms256m -Xmx512m in setclasspath.sh file as well as putting CATALINA_OPTS=-server -Xms256m -Xmx512m in /etc/init.d/tomcat5.5 script file, but when I go to tomcat administration webpage and list the server status I always get Max memory: 113.81 MB. Thank you very much - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Redirect request to another Tomcat server
Liang I don't understand what NIO has to do with it. The response.sendRedirect() is part of the servlet spec and what type connector you are using in Tomcat should have no effect on this. I'd appreciate it if someone would correct me here if I am wrong. As a matter of interest I use redirects extensively on tomcats with NIO, APR and the standard connector and they all work ok. As Johnny K correctly observed and as its name implies it sends a 'redirect' 302 response to the browser. As also observed the 'session' is a UNIQUE relationship between the server and the browser. I think it would be helpful if the you actually clarified exactly the purpose of redirecting from one tomcat instance to another. On another point from the your earlier message you talk of a 'refused session' being the reason for a redirect. AFAIKS a 'refused session' is no session at all. Maybe a better way of putting it is refusing to start a new session? Sending a redirect would allow a session to be created between the browser and the 2nd server. But it does sound suspiciously like load balancing to me... and of course there is the issue of making sessions sticky. So I would agree with Johnny and others as below, use something like mod_jk and a cluster. Regards Alan Chaney Johnny Kewl wrote: Liang, I think whats bothering all of us, is that sometimes the concept itself is going wrong, and that what I think the other guys are asking. As you can see, you now getting into cookie management and all that heavy stuff, and eventually maybe suicide ;) If its load sharing, maybe think about putting it behind Apache and using a JK connector. I'm not sure if there or NIO issues there, maybe the other guys can comment... but if something like that is possible, then your servlets are standard and JK is watching sessions and doing all that for you. Just a thought.. --- HARBOR: http://coolharbor.100free.com/index.htm The most powerful application server on earth. The only real POJO Application Server. Only appearing once now in emails ;) --- - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] !DSPAM:482c8ec0298441572928584! - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Streaming Video Media
My understanding is that you want your users to be able to *view* a streaming file but not download it to their file system? Unfortunately there is no way to absolutely prevent this happening, because the data of the file MUST be transferred from the server to the browser to allow the end user to watch it. There is no mechanism in tomcat or any other web server which can control what the user does with data when they have acutally got it in their browser. The best thing that you can do is to try and avoid having the download link actually appear in the web page. This can be done by for example having a Flash player to play the video and writing ActionScript to make a specific request to your server using some kind of obfuscated URL. Of course, this mechanism will not stop someone with any understanding of HTTP and HTML from discovering the correct URL to use, but it will stop people just casually right-clicking on a link and downloading it. The only other alternative is to employ some kind of DRM system, but I guess you don't want to go that way. HTH Alan Chaney bperquku wrote: thank you for your reply, Actually my webapp uses a db authentication, but even registered users will not have to download videos, only to see them. thnx. Александър Л. Димитров wrote: Hi, Quoth bperquku: Hi, I installed Tomcat 6.0. I have sample webapp that streams's video content. Is it possible somke how to protect video from downloading Simplest suggestion: why don't you just let the webapp authenticate the user against some user DB? If security isn't a concern there are even simpler methods (like, md5-hash the password and store it locally). Query for it with a JS input dialog or an http form. If it's supposed to be very secure, use SSL on top. Aleks - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Multiple Hits to same JSP
If you have an apache server fronting this there are IP address controlled rate-limiting plug-ins like: http://www.topology.org/src/bwshare/README.html and http://dominia.org/djao/limitipconn2.html I have no experience of either of these. HTH Sameer Naik wrote: We just had one more incident today, 3000 hits total in 5 minutes! User agent in MSIE 7.0. We have a load balancer and 3 apache servers behind it. Since Apache is logging the request in access, for sure, it is not generating flood itself. Then the culprit could be load balancer hardware, user's buggy browser or some proxy server in between. From the access logs, the request seems to be coming from genuine users. User's are either closing there browsers (no hits for some period) or logging out and trying again. The same page works fine when they do that. We are analyzing logs to come up with a pattern w.r.t. user agent. We cannot pat ourselves for serving so many requests, because every such time, tomcat thread count (set to 100) maxes out (we get a page), each thread borrows DB connection from pool, DB cache size goes to 100 and due to a bug/feature in Oracle connection (round robin feature for checking out connection), each one never gets cleaned up. so that increases sessions on oracle database server. had a similar experience when I run the FireBug extension in FireFox. but there was not as many as 500 requests more like 20 under some circumstances. /Per Jonsson Christopher Schultz skrev: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Alan, Alan Chaney wrote: | Have you checked to see whether or not they are real requests - that is, | coming from the web. If they are there's nothing anyone on this list can | do... Not entirely. It's possible to write a throttling filter that might be able to reject some of these requests... the only question is if it is even useful to do in the first place. The processing and memory requirements might outweigh the benefits of rejecting the requests in the first place. Since all responses are 200 (success), you might just smile, say hey, it's great that my web server can handle so many responses so fast with no errors and sit back and relax. - -chris - Original Message From: Sameer Naik [EMAIL PROTECTED] To: users@tomcat.apache.org Sent: Friday, May 9, 2008 2:07:30 PM Subject: Multiple Hits to same JSP Hi, We are using Apache 2.0.53 + mod_jk 1.2.21 + tomcat 5.0.28 combination and seeing multiple hits to a single JSP file in quick succession, like 500 hits in a minute from same user ID and same IP address. Response code is 200 for all the requests. It is happening randomly from various user agents. Did anyone encounter such scenario? Can we log something in Apache logs to debug the issue? (We are already logging referrer, UA, byte range request values etc). Thanks, Sameer Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ !DSPAM:4828b47c210943033718476! - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Multiple Hits to same JSP
Have you checked to see whether or not they are real requests - that is, coming from the web. If they are there's nothing anyone on this list can do... Try monitoring you network with something like wireshark. I have seen similar behavior - I think it may be from badly written spiders or feeble attempts to hack your site. If they are truly vindictive the only thing you can do is block them with a firewall. Regards Alan Chaney Sameer Naik wrote: Hi, We are using Apache 2.0.53 + mod_jk 1.2.21 + tomcat 5.0.28 combination and seeing multiple hits to a single JSP file in quick succession, like 500 hits in a minute from same user ID and same IP address. Response code is 200 for all the requests. It is happening randomly from various user agents. Did anyone encounter such scenario? Can we log something in Apache logs to debug the issue? (We are already logging referrer, UA, byte range request values etc). Thanks, Sameer Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ !DSPAM:4824bdee28727785049143! - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Tomcat problem on a multiple CPU system
Hi Antoine The thing to remember is that this is a system which has (at least) four main parts: 1. Tomcat 2. The operating system 3. A network connection 4. Your application (and potentially) 5. A database (but you didn't mention that) Here are some questions. 1. How do you make the connection to the servlet. Does the browser run on the same machine as the application? 2. Does you application create network traffic? If so, how many bytes are transferred to the browser? Each servlet thread will have to wait until the application has transferred all the data out. 3. What kind of disk activity does your application generate? Is it different when the app is running from the servlet? Probably somewhere your servlet threads are sleeping waiting for a resource. You could do a thread dump to see what is happening (I don't use Windows so I can't remember how you do that with the Win setup) In the end, you'll need to profile the system to work out where the bottlenecks are. You'll need to use network analysers and probably Java profilers to track down what's happening such as when packets are received, when the replies are generated and maybe profile what your app. is doing. HTH Alan Chaney Gilbert, Antoine wrote: Hi I have a 2x quad core (8 cpu units) server. If I start a java program and this one is launching (at the same time) 8 thread doing some CPU intensive jobs, all the CPU are used at 100%, and that's what I'm expecting.. But, if I am using tomcat, and I call a servlet 8 times to process these 8 jobs, it take longer to execute these same 8 jobs and all the CPU are not used at 100%, it's more like 30%... Any idea about this problem or behavior ? I'm using Tomcat 5.5.17, windows, JDK 1.6 Antoine !DSPAM:481e1bf27941527717022! - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: MaxThreads - max. users ?
Like most things in complex network apps there is no simple answer. MaxThreads refers to the number of simultaneous open HTTP network connections there can be. A connection is opened to enable the HTTP request response cycle (request from browser - server, response from server- browsers). This does not exactly translate into users because depending upon the page it is possible for the browser to make multiple simultaneous requests (images, text, javascript, css etc) for the same browser page. 'Sessions' in web server parlance refers to the ability whereby the server can track the state of a 'user conversation' which may spread across many pages. The identification of the user must be saved throughout this session if there are authentication issues involved - private pages, secure forms etc. There is no direct relationship between the number of sessions and the number of active, open connections. When estimating the capacity of a server you must work out the average page response time and then that will give you the number of users/hour. The only real way that you can really determine the performance of a server is to measure it - there are simply too many interacations at a system level to make sense of any simple calculations. A server set to handle 200 max connections with a response time of 200ms can probably handle around about 1000 connections a second. Factors to consider: 1. what kind of application? Simple file access or complex database? 2. the need for failover (clustering etc) 3. what kind of user interaction? (forms, simple page browsing?) It should be noted that client interactions using 'ajax' techniques where the browser reconnects mid-page can actually cause a significant increase in server traffic. Once again, the only way to know is to experiment. HTH Alan Chaney Stephanie Wullbieter wrote: Hello, on http://tomcat.apache.org/tomcat-5.5-doc/config/http.html is for parameter MaxThreads written: The maximum number of request processing threads to be created by this Connector, which therefore determines the maximum number of simultaneous requests that can be handled. If not specified, this attribute is set to 200. Could You please tell me what exact a request is? Does it mean that when I have e.g. MaxThreads=20, 100 users can use my webapp if only 20 of them at the same time request data from the webapp and the others drink coffee? Is it the same when i have session based sso login? Thank You kindly - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: R: How to close idle connections
David Smith wrote: No, I have at most 20 idle connections, that's goes right, but my boss want less idle connections to avoid to overload the database server. So there isn't way to close an idle connection to remove the relative process? If so, I will set maxIdle=2 and everyone will be happy (expecially me :) I'll bet money the added, idle postgres connections are just sleeping while they wait for work. Given idle connections contribute virtually no additional load, don't see his argument that idle connections contribute to a database overload. If the minor increase in overhead due to sleeping threads actually overloads the database, you need to let your boss know the server hardware is way too frail for production use and needs to be upgraded. --David Agreed. I use postgres and with ps alx | grep postgres each connection shows as idle (when its not being used!) and consumes about 140k bytes of memory. On a modern server that can hardly be considered as any use at all! Alan Chaney Enrico Sasdelli wrote: Thanks for reply, I see you have maxIdle=20. Do you have more that 20 connections sitting idle? Is this really that much of a concern? As long as the connections are released (closed) and returned to the pool, I don't see the problem. No, I have at most 20 idle connections, that's goes right, but my boss want less idle connections to avoid to overload the database server. So there isn't way to close an idle connection to remove the relative process? If so, I will set maxIdle=2 and everyone will be happy (expecially me :) Thank you, Enrico The entire idea of a connection pool is the system keeps around a set of idle connections for borrow. When you code get's a connection, it comes from the pool of idle connections and returned when you close the connection. This speeds up your application by elliminating the overhead of contacting the server and constructing a new connection whenever you call for one. The pool just grabs a pre-made one off the shelf for you. --David - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] !DSPAM:4815ddca16721381456296! - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: R: How to close idle connections
Christopher Schultz wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 David, David Smith wrote: | I'll bet money the added, idle postgres connections are just sleeping | while they wait for work. Given idle connections contribute virtually | no additional load, don't see his argument that idle connections | contribute to a database overload. If the minor increase in overhead | due to sleeping threads actually overloads the database, you need to let | your boss know the server hardware is way too frail for production use | and needs to be upgraded. It could be a memory issue, and perhaps with lots of connections from different machines (maybe a clustered application and a single database instance)... lots of connections == lots of memory allocated on the server, even when the connections are idle. - -chris Chris, but as in many resource allocation issues, its not the quiescent count that's important. If the OP has a *maximum* requirement for N x 100 connections then its unlikely that the system could be so constrained as to worry about the limited number of idle connections. In other words, if you've allocated enough resource for the maximum expected load, then any less load should be easily accomadated. If you haven't you've probably got a problem... Regards Alan -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.9 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAkgWGZcACgkQ9CaO5/Lv0PCVVgCgiQHs4I8xJfbupkGXUHEBLgci qmQAn3yNwIsnO4jzF/GobTZyzXp8fe17 =ma/c -END PGP SIGNATURE- - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] !DSPAM:48161a6671411738514357! - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Response time
One a similar vein, exactly how do you connect firefox to the server? Directly, or via some kind of network connection. If its a network, what's the bandwidth? Alan Chaney Christopher Schultz wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Bruno, Bruno Matos wrote: | I'm getting documents from lucene and creating a string with all the | results with string buffer. The string creation takes 2 seconds and the | | outResponse.print(out.toString()); | | takes 1 second. Closing the writer take no time at all, although I have | to wait 2 minutes until the result shows in firefox. The same happens | with solr, that should make something like that. The xml file, only has | 300KB. Why I need to wait for so long? Have you tried saving the 300kb XML file and then loading it off the disk just to see how long the browser takes to render it? Perhaps it's all on the client side... - -chris -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.9 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAkgPX7YACgkQ9CaO5/Lv0PCBgACgjQG0lVaGNCWWNSXcmSXXxXUF AS8AoLSBsz6vGtH6zfALFvI5W3GGgtwR =2WzS -END PGP SIGNATURE- - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] !DSPAM:480f6080289839080218370! - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Response time
I do a lot of downloads of large files (several 10's of MB). Firefox seems to limit its transfer rate to about 100 kbps (that is, kilobits per sec). If you are using linux, try doing a 'wget' on the file instead of using a browser. 300,000 bytes is 2,400,000 bits (approx) so to take 2 minutes = 120 secs implies a bit rate of 10,000 bits per sec. I don't for a moment believe that is a limitation of tomcat (I regularly stream continuously 40 MBitsPerSec with hardly any CPU) Here are various random thoughts: 1. Some kind of timeout (maybe DNS?) 2. Swapping (you say CPU = 100% what about memory usage?) 3. Some kind of lock contention. HTH Bruno Matos wrote: Hello, Tank you every one. I connect to localhost and my CPU stays in 100% all the time. Open directly the xml file take no time at all. Alan Chaney wrote: One a similar vein, exactly how do you connect firefox to the server? Directly, or via some kind of network connection. If its a network, what's the bandwidth? Alan Chaney Christopher Schultz wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Bruno, Bruno Matos wrote: | I'm getting documents from lucene and creating a string with all the | results with string buffer. The string creation takes 2 seconds and the | | outResponse.print(out.toString()); | | takes 1 second. Closing the writer take no time at all, although I have | to wait 2 minutes until the result shows in firefox. The same happens | with solr, that should make something like that. The xml file, only has | 300KB. Why I need to wait for so long? Have you tried saving the 300kb XML file and then loading it off the disk just to see how long the browser takes to render it? Perhaps it's all on the client side... - -chris -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.9 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAkgPX7YACgkQ9CaO5/Lv0PCBgACgjQG0lVaGNCWWNSXcmSXXxXUF AS8AoLSBsz6vGtH6zfALFvI5W3GGgtwR =2WzS -END PGP SIGNATURE- - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Tomcat is not rendering JSP content on Port 80
BeasC wrote: My intent is to have an Apache + JK + Tomcat server that uses apache only to service static web content and and sends all dynamic content to Tomcat (so that it handles all the JSP). I downloaded and installed Apache 2.2, Tomcat 6.0, and J2SE 1.5 (Becuase j2se 1.6 was buggy and giving problems). When initially configuring the server, I included the following lines in the Apache HTTPD.conf file: LoadModule jk_module modules/mod_jk-1.2.26-httpd-2.2.4.so Apache 2.2 comes with mod_proxy as default. Either way, you must also configure apache to use either mod_jk or mod_proxy. You are trying to do this by using the 'auto config' mechanism in tomcat. and in Tomcat I included: Listener className=org.apache.jk.config.ApacheConfig modJK=c:/apache/modules/mod_jk-1.2.26-httpd-2.2.4.so / and Listener className=org.apache.jk.config.ApacheConfig append=true forwardAll=false modJK=c:/apache/modules/mod_jk-1.2.26-httpd-2.2.4.so / I personally have never used this and in the installations which I have with Apache 2.2. I use mod_proxy so others may be able to help you more here, but I still think that your problem is that your attempt to service static documents with apache is overlapping with your attempts to serve dynamic information from tomcat. Have you checked that the workers.properties file is being created correctly? What does it have in it? You have explicitly set forwardAll to false, which is OK, but it also means that you must configure apache NOT to look at the same folders that you are using for tomcat. See the comment about noRoot and forwardAll in the javadocs. Warning: When false, some configuration in the web.xml may not be duplicated in Apache. Review the mod_jk conf file to see what configuration is actually being set in Apache. It would help if you could give us your folder layout and how you expect that to map to your url structure. Basing most of the tutorials I have read about setting up this type of servers, I thought this steps were sufficient to enable the server to work in the above descirbed way. It appears, however, that I am missing something... Trouble with tutorials is that they are mainly created by people in their spare time and they can't possibly cover every variation and condition in a world where individual components of a project are released on their own timescales and to meet their own objectives. I always seem to find something doesn't quite work right when I try to do it by rote from a tutorial and I end up debugging it myself, just using the tutorial as a guide. -Carl Alan Chaney wrote: The effect you are observing is because you have configured your setup to have the jsp files in the path of the document root for apache. Apache knows nothing about jsp files so it is just returning the source to you. You have not specified O/S, JVM or Apache or Tomcat version. You might like to read the tomcat documentation before going any further: http://tomcat.apache.org/connectors-doc/ajp/ajpv13a.html would be a good place to start if you intend to use apache + tomcat, together with http://tomcat.apache.org/tomcat-6.0-doc/connectors.html if you want to configure your version of tomcat to directly serve port 80 and not use apache at all. A 'tomcat only' installation working with port 80 can easily be configured in Windows using the control panel (or so I believe as I don't use Windows myself). For a linux setup there are some additional complications - see: http://commons.apache.org/daemon/index.html to avoid running tomcat as root. Also you may find looking at archives of this list helpful. If you can't find the answers in the above and generally, http://tomcat.apache.org/connectors-doc/index.html then maybe you could specify your system more clearly and I'm sure people will be able to give you more specific help. Alan Chaney BeasC wrote: I can get Tomcat to render JSP content if I try to (for example) access the JSP installation examples using http://localhost:8080/examples/jsp But when I try to try http://localhost/examples/jsp I get nothing but the raw html code of the page (of a specific example). I have an Apache - Tomcat server, and Apache is listening on port 80 (Which is the default port used when accessing the server using its IP address. Tomcat has the following code lines in its server.xml file, that I think might serve as reference point to what I'm talking about: Server port=8005 shutdown=SHUTDOWN and Connector port=8080 protocol=HTTP/1.1 connectionTimeout=2 redirectPort=8443 / Any help would be greatly appreciated. -Carl - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To start
Re: Bending Jasper to My Will
Andy I've followed this thread with a some interest because it ties up with some things I've done in the past. I think you are trying to use a technology in an inappropriate way to solve the wrong problem. Correct me if I am wrong but you want to have a level of configuration which is more than just appearance. You want to: 1. be able to add/remove features from a particular page 2. be able to reorder features Is that correct? The next thing which isn't clear to me is at who will choose the feature set. Is this going to be a runtime thing or a startup configuration thing? Will your end-users be able to configure things or will it be the result of specific programming work? Alan Chaney Andy Clark wrote: Lucas wrote: To answer the original question, there is a mechanism that Tomcat provides to handle the specific thing you want to achieve. The solution is very Tomcat specific, so I do not really recommend it, anyhow, if you really _need_to_have _this_ then the way to achieve it is the following: [...] Thanks for the suggestion but I think I am out of luck because we're using a different web container. Even though there's a ton of different web containers, they all seem to use Jasper so that's where I was attempting to tackle the problem. But, referring to your specific suggestion, I wonder if there would be a problem. When I was browsing the Jasper source, I noticed that it caches the resolved JSP/tag files. Which means that if I only change the resolution mechanism, it won't work. Because unless I am also able to modify the cache ID, then whichever source file is resolved first for a specific JSP/tag, then that one will be cached and be returned the next time it's referenced, even if the user's skin is different. (If that makes any sense.) PS: This will make yous web app not 100% standard, and if you have to migrate this behavior to other web containers, it might get trickier, so be sure that you really need this. Understood. Which is also why I'm hoping that the Jasper developers would be open to patches that allow it to be extended in this way. Ahh, just one more thing, do not even try to modify Jasper itself unless you know what you are doing; Most people experimenting with Jasper end up in nothing. That way leads madness. Got it. :) -AndyC - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] !DSPAM:480e21ea50971721312192! - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Tomcat is not rendering JSP content on Port 80
The effect you are observing is because you have configured your setup to have the jsp files in the path of the document root for apache. Apache knows nothing about jsp files so it is just returning the source to you. You have not specified O/S, JVM or Apache or Tomcat version. You might like to read the tomcat documentation before going any further: http://tomcat.apache.org/connectors-doc/ajp/ajpv13a.html would be a good place to start if you intend to use apache + tomcat, together with http://tomcat.apache.org/tomcat-6.0-doc/connectors.html if you want to configure your version of tomcat to directly serve port 80 and not use apache at all. A 'tomcat only' installation working with port 80 can easily be configured in Windows using the control panel (or so I believe as I don't use Windows myself). For a linux setup there are some additional complications - see: http://commons.apache.org/daemon/index.html to avoid running tomcat as root. Also you may find looking at archives of this list helpful. If you can't find the answers in the above and generally, http://tomcat.apache.org/connectors-doc/index.html then maybe you could specify your system more clearly and I'm sure people will be able to give you more specific help. Alan Chaney BeasC wrote: I can get Tomcat to render JSP content if I try to (for example) access the JSP installation examples using http://localhost:8080/examples/jsp But when I try to try http://localhost/examples/jsp I get nothing but the raw html code of the page (of a specific example). I have an Apache - Tomcat server, and Apache is listening on port 80 (Which is the default port used when accessing the server using its IP address. Tomcat has the following code lines in its server.xml file, that I think might serve as reference point to what I'm talking about: Server port=8005 shutdown=SHUTDOWN and Connector port=8080 protocol=HTTP/1.1 connectionTimeout=2 redirectPort=8443 / Any help would be greatly appreciated. -Carl - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Permissions of File Created by Tomcat
This is really a linux permissions issue. How are you starting tomcat? with the $TOMCAT_HOME/bin/startup.sh or with jsvc or are you using an ubuntu startup script? You don't say anything about the user who will run the java application. Generally, the way to control the access permissions with which files are created in linux is to call 'umask' with the correct parameters. As mentioned before on this list umask is a shell command, so you must do it at the correct point or severely weaken the overall security of your installation. You need to do the following: 1. decide which user or users will be executing tomcat and the java application. 2. If you decide that you need to have two separate users, then make them both in the same group. 3. Use umask in the tomcat startup script and/or the shell in which you run your application to set appropriate access permissions - GIYF As an aside, if you are going to have two different processes writing these shared files you may also have to consider locking issues - maybe you have already done this. Regards Alan Chaney Daniel J Hulme wrote: Hi, I'm running a WebService using Tomcat 5.5 on Ubuntu 7.10 with Axis2. Files (and directories) are created by this service on a local directory: /myfiles/ The permission of the new directories and files in this directory are: Directories:'drwxr-xr-x 2 tomcat55 nogroup 4096' Files: '-rw-r--r-- 1 tomcat55 nogroup 10041' The problem is, is I want to access (write) these files using, say, a java application, it give me: java.io.FileNotFoundException: /myfiles/aDir/aFile.txt (Permission denied) How can I either: 1.Gain write access to these files (without having to constantly change the permissions in the command prompt, and without running my java application with 'root' access). 2.Create the files/dirs from tomcat with 'write access' 3.Other Thanking you in advance. Daniel - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Permissions of File Created by Tomcat
Hi Daniel Really the issues are to do with the JVM and linux rather more than tomcat directly. I can't claim to be a linux guru but you should look at it in the following way Any application which runs on linux is 'owned' by a user. There two classifications - 'system' users and 'normal' users. System users have UIDs which are less than 1024 and can invoke privileged services. 'root' is a system (privileged) user. One issue which often seems to confuse people is that the JVM is a program not an operating system. When you 'run tomcat' you are actually invoking java on the tomcat bootstrap.jar. See the javadocs http://tomcat.apache.org/tomcat-6.0-doc/api/index.html for more details. My point here is that java is 'just another program' to linux, and all the permissions rules apply to the user invoking an application. You say that tomcat is now running as root (which is a BAD THING) which implies that you are: a. logging in as root and starting tomcat OR b. letting tomcat be started by a sys init process. One decision you must make is whether or not tomcat should be allowed to access privileged ports (eg port 80) If so, then you should start tomcat using something like jsvc (see http://commons.apache.org/daemon/index.html) which when properly configured will allow you to start an app as root, bind tomcat to port 80 and then switch to a 'tomcat' user. You can set umask permissions as appropriate in the startup script. If you intend to run tomcat with its default port of 8080 (or any non-privileged port) things are a bit simpler. Create a user on your system (maybe 'mytomcat') and then simply start the tomcat ./bin/startup.sh as this user by something like: su mytomcat -c $JAVA_HOME/bin/startup.sh from within the init script. You can, of course, su to the user you are running the other java program as, then tomcat and your app will have the same user privileges - or you can create a tomcat group, make this the main group for your tomcat user, add it as another group to your 'application' user and set the appropriate umask (002) to allow group read/write (you must also set the directory permissions accordingly - set the 's' bit) Please note that these are only pointers not a rigorous set of instructions. The reality is that if you want to do anything serious in linux you must learn ins and outs of 'bash' and this list is not really the place to do that. HTH Alan Daniel J Hulme wrote: Alan, this is very useful, thank you. After a bit of Googling I decided to upgrade to Tomcat6 (apparently is has less security ussies with Ubuntu). This means that the files/dirs are now created (from the tomcat app) by 'root:root' (with the same permissions described in my first post). However, I still have the same problem. I'm running a java progam (not as 'root'), and need write access to these files. And I'm not allowed to run my java app as 'root'. I'm pretty new to linux, so your help (i.e. command examples) is much appreciated. Daniel Alan Chaney wrote: This is really a linux permissions issue. How are you starting tomcat? with the $TOMCAT_HOME/bin/startup.sh or with jsvc or are you using an ubuntu startup script? You don't say anything about the user who will run the java application. Generally, the way to control the access permissions with which files are created in linux is to call 'umask' with the correct parameters. As mentioned before on this list umask is a shell command, so you must do it at the correct point or severely weaken the overall security of your installation. You need to do the following: 1. decide which user or users will be executing tomcat and the java application. 2. If you decide that you need to have two separate users, then make them both in the same group. 3. Use umask in the tomcat startup script and/or the shell in which you run your application to set appropriate access permissions - GIYF As an aside, if you are going to have two different processes writing these shared files you may also have to consider locking issues - maybe you have already done this. Regards Alan Chaney Daniel J Hulme wrote: Hi, I'm running a WebService using Tomcat 5.5 on Ubuntu 7.10 with Axis2. Files (and directories) are created by this service on a local directory: /myfiles/ The permission of the new directories and files in this directory are: Directories:'drwxr-xr-x 2 tomcat55 nogroup 4096' Files: '-rw-r--r-- 1 tomcat55 nogroup 10041' The problem is, is I want to access (write) these files using, say, a java application, it give me: java.io.FileNotFoundException: /myfiles/aDir/aFile.txt (Permission denied) How can I either: 1.Gain write access to these files (without having to constantly change the permissions in the command prompt, and without running my java application with 'root' access). 2.Create the files/dirs from tomcat with 'write access' 3.Other Thanking you in advance
Re: jsvc creates pid file owned by root
Hi Chris Christopher Schultz wrote: Are you sure you are changing the umask for the jsvc process? I wonder if the umask is being re-set to something else when jsvc elevates itself to root. You should ask the commons folks about how to do this with jsvc, as this is really off-topic, here (but we'd love to hear the I posted an answer to this a couple of days ago. I don't think the OP quite understands that 'umask' is a *shell* command. Consequently if you have a shell script like 'tomcat' for jsvc or startup.sh you must set the umask in the shell script because a new shell is created each time. As I posted in my example, I set umask to 027 in my jsvc startup script and it works just fine. tomcat starts as root, binds to the ports and then switches to the 'tomcat' user. The pid file is owned by root (as it should be) and files created by tomcat are '640' which is what I wanted. Another point that I think the OP was confused about was that you *must* have root permission to bind to system ports in linux - so you must either start tomcat as root or with a script invoked by 'sudo' You can also set umask in /etc/profile which will apply to all users - but probably not a good thing to do. HTH Alan answer for the future). Good luck, - -chris -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.9 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAkgA6g4ACgkQ9CaO5/Lv0PBGTwCeM+4lBoXTnwzHkeirmROqWfuC co8AoJIEHbsD5gzfQxM8XNpwOeqrSdKf =euMt -END PGP SIGNATURE- - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] !DSPAM:4800eac534083966023671! - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: jsvc creates pid file owned by root
You shouldn't be messing about with the ownership of the PID file. It is created by jsvc at startup. If you use jsvc properly it will start as root, create the pid file, startup tomcat, allow tomcat to bind to ports 80 and 443 and then switch to the user specified with -user switch. When you install jsvc from the version which is part of the tomcat distribution it comes with a shell script called 'tomcat' Here's an (edited) extract from my version. . # Set umask to avoid tomcat making tomcat-users.xml public readable umask 027 # == 640 PID_FILE=/var/run/jsvc.pid . /usr/lib/tcnative/jsvc \ -user $TOMCAT_USER \ -home $JAVA_HOME \ -Dcatalina.home=$CATALINA_HOME \ -Dcatalina.base=$CATALINA_BASE \ -Djava.io.tmpdir=$TMP_DIR \ -Xmx512m \ -XX:MaxPermSize=128m \ -wait 10 \ -pidfile $PID_FILE \ -outfile $CATALINA_HOME/logs/catalina.out \ -errfile '1' \ $CATALINA_OPTS \ -cp $CLASSPATH \ org.apache.catalina.startup.Bootstrap I set a lot of options in CATALINA_OPTS which are passed to the vm - for example my JMX switches, various application configuration properties. I set the umask to 027 because that makes files read/write for tomcat and read-only for the tomcat group and read protected for the rest. This was because tomcat re-writes the tomcat-users.xml (which I happen to be using for the moment) at start up. Gunnar Boström wrote: Hi, Answers to all of you who has responded. I would be fine with 644 but I don't know how to set that. see umask above The file is owned by root so I'm not allowed to change it. My umask is by default 0022 which should be okay. I tried to set the mask to but no change. read about linux umask - you need to set it at the right point I created a pid file with the correct permissions but as expected jsvc ignored it. You SPECIFY the pid file as a parameter to the startup of jsvc. -pidfile as above. So this is what you do - assuming you are using a startup script like the provided 'tomcat': 1. Set an appropriate umask in the startup script 2. Set a pidfile location wherever you need it 3. start up tomcat EITHER as root by going ./tomcat start OR sudo ./tomcat start if you want to stay as a normal logged in user. You need to have your sudo permissions set of course - but that's another longer story. The whole point of using jsvc is that it allows you to change user from a privileged user to a normal user because no-one should run a web server as root. HTH I was hoping that there were some undocumented switches in jsvc that I could use. Regards Gunnar - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Connection pooling again
Hmm. I think the answer here is one of resource starvation - the resource in this case being the CPU. It seems that core of your test is 'Select * from table1' Where is the database? Is it another application on the same box? What mechanism do you use to connect between the database and the app? (a pipe? tcp?) How big is 'table1'? How long does that select statement take? Why should anything else happen in the system until that select has finished? Here's a guess. Look at a resource monitor and you will see that when you start your test the CPU goes to 100% and stays there. I suspect that this is a case that you are queuing on processing the select statement in the database. From a systems point of view the Java JVM on windows and linux is a *cooperative* multithreaded system. Connection pooling has nothing to do with concurrency. Its as someone said earlier a performance optimization to avoid the overhead of recreating the datasource each time you need it. It you want to write a test which shows the connection pool being used CONCURRENTLY then you must write a concurrent test! For example, open the connection, sleep for a while, do something, sleep again and do something else and then close the connection. Turn on logging for the pool and watch concurrent requests being processed. Alan Chaney [EMAIL PROTECTED] wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Daad, [EMAIL PROTECTED] wrote: | No, my test is done with threads that connect using sockets. Server | listen with ServerSocket and 30 Threads are started connecting to it. Er... did you write your own server, or are you using Tomcat? I'm using tomcat. I'm sorry... all the evidence you have presented does not support your conclusions. There are other ways to get a log file looking like the one you posted. - -chris -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.9 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAkf9PnsACgkQ9CaO5/Lv0PBAPACfR8qL7tD33mFTWCdY99D6p8ic shoAn3v0C49JvF2muOefUF5Q+QbBhVdD =kLLa -END PGP SIGNATURE- - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] !DSPAM:47fddbcd240221497319589! - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: stop apache web server for tomcat 6
something like: sudo apt-get remove apache2 - if you have problems see the ubuntu users list HTH Angelo Chen wrote: Hi, I have a ubuntu server which has apache web server 2 pre - configured, it is port 80, now I install tomcat 6 and I'd like to use port 80 as well, how can i stop apache2 in this machine? i don't need apache 2. thanks. - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Newbie: Question about first Servlet
Actually
ISO-8851-1 according to Google is a standard determining the moisture
content of butter.
http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=35218
However, ISO-8859-1 is the Latin character set definition.
Probably ISO-8859-1 is more relevant. Anyway, you fixed it! Hope you
have hours of fun learning servlet programming just like the rest of us...
Regards
Alan Chaney
Kurt L Harless wrote:
OK, figured it out.
I changed the Character Set to
?xml version=1.0 encoding=ISO-8859-1?
Instead of
?xml version=1.0 encoding=ISO-8851-1 ?
I figured this out by using the tomcat.exe to start the service and saw the
dump message when it was trying to parse my xml file.
Is this not the valid way of coding this encoding?
-Original Message-
From: Kurt L Harless [mailto:[EMAIL PROTECTED]
Sent: Saturday, April 05, 2008 10:14 PM
To: users@tomcat.apache.org
Subject: Newbie: Question about first Servlet
Greetings,
Specifics:
Window XP
TomCat 5.5
Java 1.6
Created webapp dirs under;
C:\Program Files\Apache Software Foundation\Tomcat 5.5\webapps\
Called ch1\WEB-INF\classes
In WEB-INF at created a web.xml file with the following contents;
?xml version=1.0 encoding=ISO-8851-1 ?
web-app xmlns=http://java.sun.com/xml/ns/j2ee;
xmlns:xsi=http://www.w3.org/2001/XMLSchema-instance;
xsi:schemaLocation=http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd;
version=2.4
servlet
servlet-nameChapter1 Servlet/servlet-name
servlet-classCh1Servlet/servlet-class
/servlet
servlet-mapping
servlet-nameChapter1 Servlet/servlet-name
url-pattern/Serv1/url-pattern
/servlet-mapping
/web-app
In the classes subdir to WEB-INF I compile the following java src
successfully
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
public class Ch1Servlet extends HttpServlet
{
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws IOException
{
PrintWriter out = response.getWriter();
java.util.Date today = new java.util.Date();
out.println(html +
body +
h1 align=centerHF\'s Chapter1
Server/h1 +
br + today +
/body +
/html);
}
}
I installed TomCat 5.5 as a windows server and can successfully launch
http://localhost:8080 http://localhost:8080/ and get the TomCat initial
page
Under this page I can select the link for TomCat manager and see under
applications an entry for /ch1
However, when I try to run http://localhost:8080/ch1/Serv1
http://localhost:8080/ch1/Serv1 I get HTTP Status 404 - /ch1/Serv1
Anyone want to help a newbie?
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Re: How can I refresh tomcat in the java code?
.
Hi Guilherme
I can see that English isn't your first language and I have a lot of
respect for anyone who is trying to work on technical things in a
foreign language - I could never do it!
To help our communication I have tried to explain below what I think it
is that you are trying to do. I may have misunderstood what it is that
you are doing so I apologize if what I am saying is wrong.
I've joined this thread a bit late, but looking at the previous emails
it seems to me that your need is that a user should be able to download
a pdf file which has been generated by your server?
This is 'dynamic content'. The server responds to the request for a file
by creating an OutputStream of pdf data
Your use case is that the user clicks on a link in a web page and the
PDF file appears in their browser?
Here's what I would expect the sequence of events to be:
1. The user clicks on the link in the browser. The link has as its href
for example www.mycompany/xyz.pdf
2. The browser generates an http GET request with the url
www,mycompany/xzy.pdf and sends it out over the net.
3. Your container detects this request, looks up the appropriate servlet
in its web.xml and calls the HttpServlet 'doGet' method.
4. Your servlet responds to this request and generates the pdf in a
temporary file.
5. You set any response headers that you need to set.
6. You read the temporary file as a byte InputStream and write this to
the servlet OutputStream.
7. The container takes the data from the output stream and transmits
across the wire back to the browser. It inserts any headers you have
specified (and a few others) at the beginning.
8. You return from the doGet.
That's it. Done!
So the stream of data which is returned as the response to .../xyz.pdf
IS the data you want displayed. You don't need to send a redirect to
xyz.pdf because you have already responded to the request.
The exact point at which the container (Tomcat) starts to transmit data
is up to the container. You can force it to send data by issuing a
'flush'. However, once it has started to respond to the specific request
you cannot issue things like a redirect. I'm simplifying a bit here.
Looking at your code there doesn't appear to be the doGet method - I
assumed initially that you were calling your class from within the doGet
of a servlet. Is this the case?
Have you checked the tomcat logs? I would have expected the server to
have thrown an exception when you attempted to send a redirect after you
have already written data.
Guilherme Orioli wrote:
Didn't get it... it just doesn't work... what do I need to use instead of
the response.redirect ?
2008/4/2, Alan Chaney [EMAIL PROTECTED]:
You don't need the redirect. The response to the request IS the pdf file.
HTH
Guilherme Orioli wrote:
It just doesn't show the Download dialog on the screen when i click the
button...
2008/4/2, Guilherme Orioli [EMAIL PROTECTED]:
ok... here's what i'm doing... in system out, something like a pdf
file is
printed... itś probably there... just don't know how to show it from
the
button i'm clicking on:
public String geraReportBois(){
try{
//Generating the report
String caminho_arquivo = new File().getAbsolutePath() +
/workspace/safeTrace/WebContent/reports/cliente/frigorifico/;
String nome_arquivo = reportBois.jasper;
JasperReport jasperReport =
(JasperReport)JRLoader.loadObject(caminho_arquivo + nome_arquivo);
Map parameters = new HashMap();
parameters.put(Caminho, caminho_arquivo);
JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport,
parameters, this.getRelatorioBois());
//--
//Exporting to File (outputStream)
ByteArrayOutputStream pdfStream = new ByteArrayOutputStream();
JasperExportManager.exportReportToPdfStream(jasperPrint, pdfStream);
HttpServletResponse response = (HttpServletResponse)
FacesContext.getCurrentInstance().getExternalContext().getResponse();
response.setContentType(application/pdf);
response.setHeader(Content-Disposition, inline;
filename=myPDF.pdf);
response.setContentLength(pdfStream.size());
try{
ServletOutputStream sos = response.getOutputStream();
pdfStream.writeTo(sos);
System.out.println(pdsStream - +pdfStream);
response.sendRedirect(myPDF.pdf);
sos.flush();
sos.close();
pdfStream.close();
pdfStream = null;
}catch(IOException e){
e.printStackTrace();
}
return ;
}catch(JRException e){
System.out.println(entrou no catch geraReportBois);
e.printStackTrace();
}
return null;
}
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Re: How can I refresh tomcat in the java code?
Chris
Very nicely put. The only thing that I'm not clear on is your comment
about sending the data as a String. The OP is trying to return a pdf
file, which is a byte stream. I'd worry about trying to wrap that in a
String because of encoding issues.
You make a good point about two simultaneous requests breaking the app.
The other issue is of course that Jasper isn't necessarily that quick at
creating a report and the report generation is in line with the servlet
request and response.
A more sophisticated solution would probably follow a pattern of:
1. Respond to request.
2. Schedule a process (thread) to create report.
3. Return from the request saying something like Your report is being
prepared...
4. When the process in 2. is complete send an email saying please go to
... to pick up your report.
You can then make a design decision as to whether or not you want the
report generating process to allow multiple instances to run or not
(probably not in most cases).
Another tweak is to cache the generated reports if they are unlikely to
change frequently etc etc...
I've written systems that work this way. It may be that the OP was
trying to do something like this.
Alan
Christopher Schultz wrote:
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1
Guilherme,
Guilherme Orioli wrote:
| Didn't get it... it just doesn't work... what do I need to use instead of
| the response.redirect ?
These good folks are telling you to do something differently than you
are currently doing it.
Right now you are trying to:
1. generate your content
2. write the content to a file on the disk
3. redirect the user to the newly-generated file on disk
Everyone is telling you to:
1. generate your content
2. write the content out to the ServletOutputStream directly
~ (not to System.out, nor to a FileOutputStream)
No disk file; no redirect. Each request re-generates the content and
sends it back to the client (browser) as the response to the original
request.
Let me lay it out for you. You currently have this code:
| try{
| ServletOutputStream sos = response.getOutputStream();
| pdfStream.writeTo(sos);
| System.out.println(pdsStream - +pdfStream);
| response.sendRedirect(myPDF.pdf);
| sos.flush();
| sos.close();
| pdfStream.close();
| pdfStream = null;
| }catch(IOException e){
| e.printStackTrace();
| }
| return ;
You should change it to:
try{
~ServletOutputStream sos = response.getOutputStream();
~pdfStream.writeTo(sos);
~sos.flush();
~sos.close();
~pdfStream.close();
} catch(IOException e) {
~e.printStackTrace();
~response.sendError(HttpServletResponse.INTERNAL_SERVER_ERROR,
~ e.getMessage());
}
return ;
/// ^^^ What is this?
I'm not sure why your method returns a String. There's no reason for it
to do so. Is this in a servlet? If it is, then you are going to run in
to trouble with the request and response objects being members of
the class. Two simultaneous requests will completely break your
application.
You can simplify the code somewhat, as well as reducing the amount of
memory required to operate by eliminating your use of a
ByteArrayOutputStream. The only downside is that your servlet will not
be returning a Content-Length with the response (which isn't that big of
a deal).
- -chris
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Tomcat podcast server
Hi everybody We've just put into service a set of web applications running under tomcat which works as a sophisticated podcast server. We deliver several thousand podcasts a day of about 20MB to 70MB in size. Originally when we started we used an Apache server (because it worked... just...) However it was clear to me that this was a poor solution for large volumes of traffic -- and I was right! So I have written a specialized http server which has the following features: 1. Adaptive rate-control algorithm which balances the load on a per-request basis to optimize the number of simultaneous requests to be serviced. The algorithm is 'pluggable' 2. Easy clustering of servers (no session state) to make it scalable. 3. Sophisticated logging to allow the easy generation of detailed reports on download activity. 4. JMX management. 5. A black-list scheme to mitigate badly written mulitmedia bots which can easily swamp a server. 6. A simple content management system to manage the import of media files. Although it is originally designed for use with mp3 files, it should work with any large media files or data downloads. The next stage of this project is to add a database controlled ad insertion facility which would insert sponsorship messages into the outgoing stream on a pre request basis. We are considering making this an open source project. If people think that this would be of interest to them to use, or if they might like to join the project, then please email me off-list at the following (substitutions obvious) alan A + T writingshow dot com So far I have only deployed this on Tomcat, but it is just a set of standard servlet 2.5 wars and should work on other containers. Currently it is running on a dual core opteron. Even at heavy loads the CPU utilization is low and it only needs about 100MB of heap to support 100 simultaneous connections. (which could represent 7GB of download) It is written using Spring and Hibernate (and a lot of other wonderful open source projects) Regards Alan Chaney - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Threads
Actually another question is what is it in your application that NEEDS 2500 threads? What does the application do? Is it 3rd party or in house? Normally the creation of a thread is considered an expensive operation and typically one tries to avoid creating new threads all over the place. Hence thread pools as used by tomcat. Peter Crowther wrote: From: Stephen Caine [mailto:[EMAIL PROTECTED] I have a process that generates hundreds of threads. Running on Mac OS X 10.5.2 Server, the thread count tops out at approximately 2500. After which, the process is terminated. The heap size is set to 1 gigabyte. My question is how to increase the capacity of the JVM to handle more threads. Is the value of 2500 an absolute limit, or can it be modified by setting the thread allocation, increasing heap size or the use of another java option? I'm not a Mac person, but... does the Mac JVM use native threads? In which case, the 2500 (plus other threads) could be an OS limit that has changed in 10.5. If you have time, what causes a process to generate threads? Calls to the API that generates a thread. Next? - Peter - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] !DSPAM:47f507bc127041839419991! - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: How can I refresh tomcat in the java code?
You don't need the redirect. The response to the request IS the pdf file.
HTH
Guilherme Orioli wrote:
It just doesn't show the Download dialog on the screen when i click the
button...
2008/4/2, Guilherme Orioli [EMAIL PROTECTED]:
ok... here's what i'm doing... in system out, something like a pdf file is
printed... itś probably there... just don't know how to show it from the
button i'm clicking on:
public String geraReportBois(){
try{
//Generating the report
String caminho_arquivo = new File().getAbsolutePath() +
/workspace/safeTrace/WebContent/reports/cliente/frigorifico/;
String nome_arquivo = reportBois.jasper;
JasperReport jasperReport =
(JasperReport)JRLoader.loadObject(caminho_arquivo + nome_arquivo);
Map parameters = new HashMap();
parameters.put(Caminho, caminho_arquivo);
JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport,
parameters, this.getRelatorioBois());
//--
//Exporting to File (outputStream)
ByteArrayOutputStream pdfStream = new ByteArrayOutputStream();
JasperExportManager.exportReportToPdfStream(jasperPrint, pdfStream);
HttpServletResponse response = (HttpServletResponse)
FacesContext.getCurrentInstance().getExternalContext().getResponse();
response.setContentType(application/pdf);
response.setHeader(Content-Disposition, inline; filename=myPDF.pdf);
response.setContentLength(pdfStream.size());
try{
ServletOutputStream sos = response.getOutputStream();
pdfStream.writeTo(sos);
System.out.println(pdsStream - +pdfStream);
response.sendRedirect(myPDF.pdf);
sos.flush();
sos.close();
pdfStream.close();
pdfStream = null;
}catch(IOException e){
e.printStackTrace();
}
return ;
}catch(JRException e){
System.out.println(entrou no catch geraReportBois);
e.printStackTrace();
}
return null;
}
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Re: Top mail servers
Steffen Heil wrote: It's very fast, relyable and flexible. Agreed. The configuration language is even turing complete... Be aware, that it's initial configuration may be a huge step. On debian/ubuntu you get a multi-file configuration by default, which is good, if the package is updated. However I found it more easy to do administration using a single-file config. (you may start copying the auto-generated config from the multi-file system to /etc/exim4/exim4.conf.) Heartily agreed! I messed around with the multi-file administration scheme for 2 or 3 days and then decided that what I really needed was to understand how exim worked. Having done that, it was easier just to edit one file. Phil Hazel's book is very useful. After all, he wrote exim. HTH - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Top mail servers
Have you looked at exim? (www.exim.org). sendmail is rather dated. I have no experience of postfix. I have set up two mailservers with exim. The documentation is thorough, but setting up a public production mailserver is not for the faint-hearted. Exim is supposed to be significantly easier to configure than sendmail. You will also probably need a POP or IMAP server. I found dovecot to be very good. I also implemented a dspam spam filter. Not for beginners, but once you get it going properly it absolutely wipes all the noddy PC spam filters off the map. Ubuntu has a 'distribution' of exim, dovecot, postfix etc. However, you will still need to understand how they work which is a far more time-consuming task than the actual physical installation. HTH Srivastava, Abhay wrote: Folks, I am in the process of hosting a site on Tomcat on Ubuntu. I will be also running a mail server. As per your experience which are the top mail servers? While googling I came to know these names : Sendmail Postfix I would appreciate if you can give your inputs. Thanks, abhay !DSPAM:47ed0b5181291562881678! - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Checking tomcat metrics in a non-intrusive way
In the real world what network connections will exist between you and your real clients? How many ports do you have on your server? How fast are they? How big are the pages being requested? Including images, css files etc? If you have 500 concurrent users will you have 500 times the traffic on the wire? or will you have some intermediate caching? You talk of a db so it is unlikely that caching can be used to much effect. If have (say) 100kbytes total per transfer x 500 = 50 MBytes for 500 people each making one request. Unless you can guarantee a GB connection to them all the thing that's going to take the most time is the time to transfer that data over the wire. 50 Megbytes (I spell it out to be clear what I am talking about) is 400 megabits If you have a 100 megabit connection to your clients then about 5 s will of delay (latency) will have to be shared between your clients. Some will get less, some will get more latency In the real world very few end users have even a 100 Mbit point to point connection to the server. If you factor in the 'down the wire' time for someone with a dodgy cable connection then a response time of 250 ms would be good for a given individual. I have spent a lot of time recently tuning and examining the peformance of tomcat and I came to the conclusions: 1. On a modern machine it takes very little time indeed for tomcat to process an incoming request. 2. As the number of requests goes up the probability of issues with I/O outside of the 'control' of tomcat become prevalent. 3. In the real world with real applications its things like database access which dominate performance. 4. Users' network connections are probably a major peformance issue unless you have extremely good connections between the server and the clients. You suggested earlier that you might have to use an alternative. Out of interest what alternatives are you considering? wicket0123 wrote: It matters to us because we are talking about response time of under 10ms for 500 concurrent users. Our internal application metrics are in the nano-seconds. If the container adds a lot of overhead, we may want to switch to other containers. For scalability testing, our testing is done in a closed network. All machines are on same subnet, so we eliminate network being the bottleneck here. If anything, it will be either: client machine, server machine, app code, DB. No firewall or anything in between for initial test. Basically, I used JMeter to run 500 concurrent users against our app. The response time shown by JMeter is the total response time. total response time = network round trip + time spend on server network round trip = time spend sending request + time spend receiving response time spend on server = time spend running container code + time spend running app code + time spend talking to DB (include db round trip) Let's take an example using my results, JMeter reports that for 500 concurrent users making request to our application, the average response time was 1 second. That already broke our SLA which is 15 milliseconds. My questions that needs to be answered: 1) out of that 1 second, how much was due to network? 2) out of that 1 second, how much was spend running our application code? I got this, we have internal metrics 3) out of that 1 second, how much was spend running tomcat code? this maybe a bit off track to the initial question, but those are the things Im trying to answer. I've been looking at tools like Manage Engine which shows you average response time which they claim is time spend in tomcat. However, they only show down to the millisecond level. And, if they're able to show that, it means that they're calling some tomcat APIs. I want to know which APIs, so that I can write my own program to query them. Christopher Schultz-2 wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Wicket, wicket0123 wrote: | Hi Charles, | Thanks for the reply. JMeter doesn't help me here because the response | time includes network time. The reason I'm looking into the tomcat API is | because i want a way to query tomcat for the numbers. So, the metrics I am | after are: | | 1) How much time was spend in tomcat? no network You can't get this information without a real profiler, which will, of course, interfere with performance. | 2) How much time was spend on the servlet? The best you can do, here, is to write yourself a Filter (or Valve, I suppose) and simply take timestamps. As with all instrumentation, taking samples takes time. Rest assured that reading the system clock is /very/ fast. ;) I suppose if you know the total response time and the servlet time, you could simply subtract the servlet time to see how much Tomcat overhead is in there. Does it really matter? | 3) What is the overall average response time for a request when there are X | number of users active? To me, this all comes down to /useful/ metrics. For instance:
Tomcat 6 and placing jars in $CATALINA_HOME/lib
We are using tomcat 6.0.16 with a jdk 1.6. I have a number of web applications which use, for example, spring and hibernate. Is there any reason why these jars (and their dependencies) should not be placed in $CATALINA_HOME/lib? It would save a lot of time uploading new releases of my own applications to my servers. From my reading of the docs there could be a potential problem if there is a conflict between existing classes in the TC distribution and the jars I would put in the 'lib'. What's the recommended practice? Thanks in advance. Regards Alan Chaney - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Tomcat 6 and placing jars in $CATALINA_HOME/lib
You're right. I debated whether or not there was an argument that I should always use the same jars for each project so it didn't matter, but then I decided that there was bound to be some case where that wouldn't work for some unforeseen reason. Its best to keep each webapp independent. There are other solutions to the time of uploads. Thanks Caldarale, Charles R wrote: From: Alan Chaney [mailto:[EMAIL PROTECTED] Subject: Tomcat 6 and placing jars in $CATALINA_HOME/lib Is there any reason why these jars (and their dependencies) should not be placed in $CATALINA_HOME/lib? The primary reason not to lump everything in one basket is webapp independence, which the servlet spec encourages. If you do put commonly used jars in the lib directory, you're tying all your webapps to one instance of those particular classes. This can create problems with versioning, should some of your apps migrate to newer levels of the common libraries, and with reloading webapps, since those libraries may retain references somewhere to objects of the webapp. Given the price of disk and memory these days, along with automated scripts to build your .war files, the only thing you'd really save on is time to transfer an updated webapp. Is that really a dominant factor, given the drawbacks? - Chuck THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY MATERIAL and is thus for use only by the intended recipient. If you received this in error, please contact the sender and delete the e-mail and its attachments from all computers. - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] !DSPAM:47eab1f3292727785049143! - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: RESIDENTIAL MEMORY 100%
Caldarale, Charles R wrote: From: karthikn [mailto:[EMAIL PROTECTED] Subject: Re: RESIDENTIAL MEMORY 100% 2) In Remote TOMCAT5523 /infinet/karthik/TOMCAT5523/bin i inserted a new argument in catalina.sh as follows export JAVA_OPTS=-Dcom.sun.management.jmxremote.port=8999 I think you also need this: -Dcom.sun.management.jmxremote.ssl=false You do - at least, it works for me! However, there are two other issues which I ran into. 1. A lot of linux installations have the 'localhost' setting something like this in /etc/hosts 127.0.0.1 localhost my.machine.com Sun doesn't like this. You must explicitly set the 'outside' IP address so you end up with something like: 127.0.0.1 localhost 123.456.123.456 my.machine.com That confused me for about a day until a lot of googling came up with the above answer. I could connect from linux to linux but not windows to linux. Also see http://blogs.sun.com/jmxetc/entry/troubleshooting_connection_problems_in_jconsole and http://java.sun.com/j2se/1.5.0/docs/guide/management/faq.html which has a lot of useful stuff for debugging jmx remote problems. And don't forget to check the firewall! Regards Alan Chaney - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: RESIDENTIAL MEMORY 100%
Firstly, you are only making 350M of your memory available to the application. xmx=350m means 350 megabtyes is reserved for the heap. Secondly, that's probably not the issue! You are correct in that you are running a 32 bit JVM. That's probably not the issue either but it means that most of the 6GB of RAM you said you had is not actually relevant. Next. you keep saying that you are using netstat to look at your system. but the display below is that of 'top'. I'm not familiar with your Unix version so maybe netstat is different on your system. Neither netstat nor top are that much use for delving into linux memory issues, never mind about java issues. It is extremely difficult to correlate the way that linux uses memory to what is actually happening inside the JVM. The next issue is that thousands of people all over the world use tomcat and don't suffer from the problem that you are seeing, so it is most likely that the problem is with your application. I notice that you have 535 process listed - that's an awful lot. You need to investigate what is actually happening inside the application - the best way of doing that is to use either jconsole or a profiling tool. You are using java 6 which means that you can easily set up a jconsole session to display what is happening. If you use jconsole you will be able to check the real JVM memory usage over time and force a GC to see how much of that memory is actually held by a strong reference. And of course what do the log files show? Are you getting out of memory errors? Are you getting RTEs? Another thing to check is that is the system swapping? I notice that in the statistics below you don't show the swap usage. This is often a trap for the unwary. HTH karthikn wrote: Hi is running a 64bit JVM. JDK used is 32 bit probably by running java -version on this Unix 11 server bash-3.2# ./java -version java version 1.6.0.00 Java(TM) SE Runtime Environment (build 1.6.0.00-jinteg_12_nov_2007_21_58-b00) Java HotSpot(TM) Server VM (build 1.6.0.00 jinteg:11.12.07-21:02 PA2.0 (aCC_AP), mixed mode) This version is avaliable from HP Unix site http://h18012.www1.hp.com/java/ As per HP site 64 bit is the version HP is distributing I also have some more netstats report for last 4 hrs before we did the restart of the web container ( TOMCAT 5523) Tue Mar 25 15:52:06 2008 System: voise1 Load averages: 1.45, 2.23, 2.28 535 processes: 509 sleeping, 25 running, 1 zombie Cpu states: CPU LOAD USER NICESYS IDLE BLOCK SWAIT INTR SSYS 01.23 2.0% 0.0% 6.9% 91.2% 0.0% 0.0% 0.0% 0.0% 11.66 6.8% 0.0% 3.9% 89.3% 0.0% 0.0% 0.0% 0.0% --- - - - - - - - - avg 1.45 4.9% 0.0% 4.9% 90.3% 0.0% 0.0% 0.0% 0.0% Memory: 3894732K (1548140K) real, 7334992K (3049776K) virtual, 829420K free Page# 1/36 CPU TTYPID USERNAME PRI NISIZE RES STATETIME % WCPU% CPU COMMAND 0pts/3 16406 root 152 20 2412M1218M run 103:21 31.77 31.72 java 1 ?12779 root 152 24 282M 163M run 2:27 9.90 9.88 xas 1 pts/4 8251 root 178 20 11608K 9628K run 0:02 1.12 1.12 top 1 ?12733 root 152 24 79064K 29540K run 3:28 1.06 1.05 voiseBLG 0 ?37root 152 20 8832K8832K run 3:44 0.55 0.55 vxfsd Over a period of 12 hrs the RES STAT reaches 2000M when CPU for java is 100% The web application refuses to display the main page,even though we have the GC configured as JAVA_OPTS=-server -Xms350m -Xmx350m -XX:+UseParallelGC -verbose:gc with regards Karthik sterling wrote: I am sorry, if this is the wrong list, for submitting questions about apache on linux and router issues. This problem generated from alcatel to zoom x6 router change. Traceroute to webpage reports router address, but webserver is at machine address on the same routed network. Cannot see webpages on browser from outside or inside. Thanks. s. list, On Mon, 24 Mar 2008, Alan Chaney wrote: | yes We have used -Xms or -Xmx Configuration , since the system RAM is | 6 GB | as | | JAVA_OPTS=-server -Xms350m -Xmx350m -XX:+UseParallelGC -verbose:gc So you have a 3.5GB heap. What are you filling it with? It's probably not a memory issue if... Actually the OP's heap appears to be 350M not 3.5G . I'm still wondering what he does with the other 5 gigs. Also its not clear whether or not he is running a 64bit JVM. Alan - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED
Re: RESIDENTIAL MEMORY 100%
sterling wrote: I am sorry, if this is the wrong list, for submitting questions about apache on linux and router issues. This problem generated from alcatel to zoom x6 router change. 'Fraid so. What's more you appear to be thread hijacking! This list is for tomcat, the apache java servlet container. If you have an issue with the Apache web server I suggest that you try http://httpd.apache.org/userslist.html for more information, and maybe read http://www.catb.org/~esr/faqs/smart-questions.html Traceroute to webpage reports router address, but webserver is at machine address on the same routed network. Cannot see webpages on browser from outside or inside. Thanks. s. list, On Mon, 24 Mar 2008, Alan Chaney wrote: | yes We have used -Xms or -Xmx Configuration , since the system RAM is | 6 GB | as | | JAVA_OPTS=-server -Xms350m -Xmx350m -XX:+UseParallelGC -verbose:gc So you have a 3.5GB heap. What are you filling it with? It's probably not a memory issue if... Actually the OP's heap appears to be 350M not 3.5G . I'm still wondering what he does with the other 5 gigs. Also its not clear whether or not he is running a 64bit JVM. Alan - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: RESIDENTIAL MEMORY 100%
karthikn wrote: Hi Sorry for the dely, thx for the prompt reply I was just looking into using Jconsole as u said,but since the UNIX 11 server,does not have GUI,I probably would have to do some remote Jconsole for the same. Can u please tell me or provide me URL on how do i set up mbeans-descriptor.xml so the jconsole can be usaed for monitering remote JMX. Tomcat documents do not say any thing about how to achieve the same. If you are using tomcat 5.5 or 6 you don't need to worry about the 'mbeans-descriptor' stuff as tomcat already has JMX support built-in. I wasted a few hours before I realized that its all there for you. To set up jconsole to remotely access a server is fiddly and depends a lot upon your local server configuration. I suggest that you google for: jmx remote The Sun site has all the information on jmx that you will need. Also, study the comments in the $JAVA_HOME/jre/lib/management/*.properties files - its all there. Once you have connnected by jmx you will be able to get lots of useful information about cpu usage and memory usage of the tomcat components. If you want to add jmx support to your application then 'google is your friend'. HTH Spec Os = Unix 11 jsdk = 1.6 Tomcat =5.5.23 version thx in advance with regards karthik Alan Chaney wrote: Firstly, you are only making 350M of your memory available to the application. xmx=350m means 350 megabtyes is reserved for the heap. Secondly, that's probably not the issue! You are correct in that you are running a 32 bit JVM. That's probably not the issue either but it means that most of the 6GB of RAM you said you had is not actually relevant. Next. you keep saying that you are using netstat to look at your system. but the display below is that of 'top'. I'm not familiar with your Unix version so maybe netstat is different on your system. Neither netstat nor top are that much use for delving into linux memory issues, never mind about java issues. It is extremely difficult to correlate the way that linux uses memory to what is actually happening inside the JVM. The next issue is that thousands of people all over the world use tomcat and don't suffer from the problem that you are seeing, so it is most likely that the problem is with your application. I notice that you have 535 process listed - that's an awful lot. You need to investigate what is actually happening inside the application - the best way of doing that is to use either jconsole or a profiling tool. You are using java 6 which means that you can easily set up a jconsole session to display what is happening. If you use jconsole you will be able to check the real JVM memory usage over time and force a GC to see how much of that memory is actually held by a strong reference. And of course what do the log files show? Are you getting out of memory errors? Are you getting RTEs? Another thing to check is that is the system swapping? I notice that in the statistics below you don't show the swap usage. This is often a trap for the unwary. HTH karthikn wrote: Hi is running a 64bit JVM. JDK used is 32 bit probably by running java -version on this Unix 11 server bash-3.2# ./java -version java version 1.6.0.00 Java(TM) SE Runtime Environment (build 1.6.0.00-jinteg_12_nov_2007_21_58-b00) Java HotSpot(TM) Server VM (build 1.6.0.00 jinteg:11.12.07-21:02 PA2.0 (aCC_AP), mixed mode) This version is avaliable from HP Unix site http://h18012.www1.hp.com/java/ As per HP site 64 bit is the version HP is distributing I also have some more netstats report for last 4 hrs before we did the restart of the web container ( TOMCAT 5523) Tue Mar 25 15:52:06 2008 System: voise1 Load averages: 1.45, 2.23, 2.28 535 processes: 509 sleeping, 25 running, 1 zombie Cpu states: CPU LOAD USER NICESYS IDLE BLOCK SWAIT INTR SSYS 01.23 2.0% 0.0% 6.9% 91.2% 0.0% 0.0% 0.0% 0.0% 11.66 6.8% 0.0% 3.9% 89.3% 0.0% 0.0% 0.0% 0.0% --- - - - - - - - - avg 1.45 4.9% 0.0% 4.9% 90.3% 0.0% 0.0% 0.0% 0.0% Memory: 3894732K (1548140K) real, 7334992K (3049776K) virtual, 829420K free Page# 1/36 CPU TTYPID USERNAME PRI NISIZE RES STATETIME % WCPU% CPU COMMAND 0pts/3 16406 root 152 20 2412M1218M run 103:21 31.77 31.72 java 1 ?12779 root 152 24 282M 163M run 2:27 9.90 9.88 xas 1 pts/4 8251 root 178 20 11608K 9628K run 0:02 1.12 1.12 top 1 ?12733 root 152 24 79064K 29540K run 3:28 1.06 1.05 voiseBLG 0 ?37root 152 20 8832K8832K run 3:44 0.55 0.55 vxfsd Over a period of 12 hrs the RES STAT reaches 2000M when CPU for java is 100% The web application refuses to display the main page,even though we
Re: RESIDENTIAL MEMORY 100%
| yes We have used -Xms or -Xmx Configuration , since the system RAM is | 6 GB | as | | JAVA_OPTS=-server -Xms350m -Xmx350m -XX:+UseParallelGC -verbose:gc So you have a 3.5GB heap. What are you filling it with? It's probably not a memory issue if... Actually the OP's heap appears to be 350M not 3.5G . I'm still wondering what he does with the other 5 gigs. Also its not clear whether or not he is running a 64bit JVM. Alan - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Tomcat on Leopard
I'd guess that you copied the text in the tutorial using an editor which
converted it to an RTF
(Rich Text Format). The text you show in your email is rtf markup.
The startup_tomcat file is a shell script which is setting the following
environment variables
JAVA_HOME - where you have installed our java sdk
JRE_HOME - the java runtime
CATALINA_HOME - the location of your tomcat files
You can set these 'by hand' by typing the lines in at the command line.
Its better to set them in the .bashrc file.
Hope that helps
maxchoc wrote:
I'm trying to install Tomcat 6.0.16 on Leopard. I'm following a tutorial on
http://swetnam.wordpress.com/2007/12/15/installing-apache-tomcat-6-on-os-x/
I've gotten to the point of trying to start tomcat on my mac but when in the
Terminal, I get the following
sh-3.2# ./start_tomcat
./start_tomcat: line 1: {rtf1ansiansicpg1252cocoartf949cocoasubrtf270:
command not found
./start_tomcat: line 2: syntax error near unexpected token `}'
./start_tomcat: line 2: `{\fonttbl\f0\fswiss\fcharset0 Helvetica;}'
What am I missing?
Thanks
marlene
-
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Re: Does tomcat support multicores
XP Home only supports one core - however, that would hardly be an OS for a production web server (grin) XP Professional is limited to 2 cpus I would suspect that the OPs factors were related to IO Bandwidth or running out of threads as suggested earlier. I've found that a modern multicore machine doesn't actually spend very much time processing the Tomcat stuff at all. Caldarale, Charles R wrote: From: Christopher Schultz [mailto:[EMAIL PROTECTED] Subject: Re: Does tomcat support multicores | Doesn't XP limit itself to two cores? I don't think so. I'm sure some versions of XP are limited to two CPUs, since that was a concern when HyperThreading was all the rage. It may be just the Home edition, rather than Pro. I know the Windows Server versions (different license than XP) all support at least four CPUs. - Chuck THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY MATERIAL and is thus for use only by the intended recipient. If you received this in error, please contact the sender and delete the e-mail and its attachments from all computers. - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] !DSPAM:47c72002262671410093335! - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: How to make Tomcat do not use /dev/random?
Problems with /dev/random relate to waiting to generate enough entropy after restart of the OS. Does this slow start up happen only after the machine has been restarted or does it happen every time Tomcat is started? If the latter, then it is unlikely to be associated with /dev/random and much more likely to be something like an unresolved IP address causing a network timeout. As Juha suggests, get a thread dump and work out exactly what the problem is. Mohamed Mohamedin wrote: Dear All, I am facing a problem with tomcat which make it start very slowly. I found while searching that Tomcat reading from /dev/random to get random numbers may be the cause. So I am asking How to prevent that? Or if there is another cause please tell me. Thanks a lot !DSPAM:47b837c3258241839419991! - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: OT: java memory question -Xmx2048m
For some reason Linux always calls 64 bit OSes 'AMD' - in fact, the sun 64 bit AMD version works fine on modern 64 bit Intel CPUs. The confusion comes because there was an older 64 bit design from Intel called the 'Itanium' which was intended for servers and had a completely different instruction set. The Xeon family and the E64 family are all compatible with the 'AMD' 64 bit JVM You say DELL 2590 - do you mean DELL 2950? The 2950 is takes Intel Xeon processors which will work with the so-called 'AMD' JVM. Hope that helps Regards Alan Chaney Dave wrote: I installed Linux FC6 64-bit on the machine DELL 2590(I think it is INTEL type CPU). But JVM 64-bit is only available for AMD and SPARC. Is the SUN not support INTEL? Thanks, Dave David Delbecq [EMAIL PROTECTED] wrote: En l'instant précis du 25/02/08 13:51, Dave s'exprimait en ces termes: Our Linux(FC) machine has 8G physical memory and 12G swap size. I am using JDK 1.5. I tried to set the Java option -Xmx to set max heap size for best performance, the allowed max heap size is 2048M . Does that mean that the JVM can not use all the physical memory (8G) ? Thanks. Dave - Never miss a thing. Make Yahoo your homepage. The maximum memory the JVM can use depends on the maximum size of continuous memory segment the OS you run on allows you to reserve. On 32 bits linux, it's about 2G (that is 4G minus memory area reserved for kernel, minus memory area used by libraries minus other thingies jvm might use). To get more you will need a 64bits JVM + a 64 bits OS. Note it's a limitation of hardware architecture and OS more than a limitation of JVM. PS: if you plan to swap-out 12G of datas, i hope your disks are fast :) - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: NIO connector under heavy load drops incoming requests?
Actually I've seen something like this. I'm under a lot of pressure to get something out so I haven't investigated it further, but what seemed to be happening is that if the client slowed down the NIO connector was throwing a SocketTimeout. I tried messing about with the timeout settings but couldn't get the problem to go away, so I just switched back to the blocking I/O for the moment which works OK. This is 6.0.16. My usage is quite different - I am delivering a small number of some very large files and the requests per minute is limited by the available network bandwidth. Its on my list to characterize the problem more fully. Regards Alan Emile Litvak wrote: Hello everyone, We have a high load environment where we are running tomcat 5.5.15 successfully. We are interesting in reducing the system CPU load and switching to Tomcat 6 with NIO, but so far have run into a few issues. After trying out the patch Filip recommended (http://svn.apache.org/viewvc?view=revrevision=618420) we did get further (our CPUs were not pegged any more and exceptions went away), but it appears that about 2/3rds of the requests are being dropped. I was going to file a bug, but I thought I'd post it first to see if anyone has any ideas. We have many tomcat servers running 5.5.15. I took one of the machines, and put 6.0.16 on it, patched it. Each server gets around 3K requests a minute during the time window when I saw doing my experiments. Using 6.0.16 regular HTTP connections, I do get around 3K requests per minute that we process. With NIO, we only see around 1.2K per minute. Here are the two connector configurations. Regular config Connector port=8000 maxThreads=500 minSpareThreads=25 maxSpareThreads=75 enableLookups=false redirectPort=443 acceptCount=100 compression=on compressionMinSize=2048 noCompressionUserAgents=gozilla, traviata compressableMimeType=text/html,text/xml connectionTimeout=0 disableUploadTimeout=true maxHttpHeaderSize=8192 / NIO config Connector port=8000 protocol=org.apache.coyote.http11.Http11NioProtocol acceptorThreadCount=4 maxThreads=500 minSpareThreads=25 maxSpareThreads=75 enableLookups=false redirectPort=443 acceptCount=100 compression=on compressionMinSize=2048 noCompressionUserAgents=gozilla, traviata compressableMimeType=text/html,text/xml connectionTimeout=0 disableUploadTimeout=true maxHttpHeaderSize=8192 / I tried to tune various NIO parameters and had no luck. I can only assume that acceptors turn away some requests for some reason without passing them down to the worker threads. Or that I have mis-configured something. Here are some interesting threads A worker thread http-8000-exec-20 52 TIMED_WAITING 2000 .omited javax.servlet.http.HttpServlet.service(690) javax.servlet.http.HttpServlet.service(803) org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(290) org.apache.catalina.core.ApplicationFilterChain.doFilter(206) org.apache.catalina.core.StandardWrapperValve.invoke(233) org.apache.catalina.core.StandardContextValve.invoke(175) org.apache.catalina.authenticator.AuthenticatorBase.invoke(433) org.apache.catalina.core.StandardHostValve.invoke(128) org.apache.catalina.valves.ErrorReportValve.invoke(102) org.apache.catalina.valves.AccessLogValve.invoke(568) org.apache.catalina.core.StandardEngineValve.invoke(109) org.apache.catalina.connector.CoyoteAdapter.service(286) org.apache.coyote.http11.Http11NioProcessor.process(879) org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.proce ss(719) org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(2080) java.util.concurrent.ThreadPoolExecutor$Worker.runTask(885) java.util.concurrent.ThreadPoolExecutor$Worker.run(907) java.lang.Thread.run(619) Idle worker thread http-8000-exec-1 21 TIMED_WAITING 5000 [EMAIL PROTECTED] aa65fe -1 41-1 17 -1 sun.misc.Unsafe.park(-2) java.util.concurrent.locks.LockSupport.parkNanos(198) java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.aw aitNanos(1963) java.util.concurrent.LinkedBlockingQueue.poll(395) java.util.concurrent.ThreadPoolExecutor.getTask(944) java.util.concurrent.ThreadPoolExecutor$Worker.run(906) java.lang.Thread.run(619) NIO endpoint http-8000-ClientPoller 20 RUNNABLE 37000 -1 285 -1 8-1 sun.nio.ch.EPollArrayWrapper.epollWait(-2) sun.nio.ch.EPollArrayWrapper.poll(215) sun.nio.ch.EPollSelectorImpl.doSelect(65) sun.nio.ch.SelectorImpl.lockAndDoSelect(69) sun.nio.ch.SelectorImpl.select(80)
Re: Help getting MySQL connected to Tomcat
[EMAIL PROTECTED] wrote: Thanks for the help. I still don't have this working completely, but tomcat is now working. I tested mysql and it is using tcp/ip. mysql -h 127.0.0.1 -u javauser -p works fine. Also the MSQLAdmin program shows it is connecting to the correct port 3306 Context init = new InitialContext(); Context ctx = (Context) init.lookup(java:comp/env); DataSource ds = (DataSource) ctx.lookup(jdbc/CurrencyDB); In the previous posts, you have used jdbc/TestDB in your resource defintion. I presume you have changed id? Resource name=jdbc/TestDB auth=Container type=javax.sql.DataSource maxActive=100 maxIdle=30 maxWait=1 username=javauser password=javadude driverClassName=com.mysql.jdbc.Driver url=jdbc:mysql://localhost:3306/javatest/ /Context - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Apache2 adn/or Tomcat6?
Or as I mentioned in a recent email, you can run something like jsvc and set the user to 'tomcat' which allows you to bind to the port and then changes the user. Regards Alan Mark H. Wood wrote: I must've missed the place in the documentation where it explains how to get Tomcat to start as root, then drop privileges after opening listening sockets on low-numbered ports that are only accessible by root, like Apache HTTPD does. On most Unix-alikes, you have to choose: o tell people to use port 8080 or whatever nonprivileged port you configured; o use a packet-mangling firewall rule to remap port 80 to port 8080 or whatever; o place a proxy (such as Apache HTTPD) in front of Tomcat to forward port 80 traffic; o run Tomcat as root, allowing buggy app.s to make arbitrary changes anywhere on your server. If I ever have time to do something about that, I'll be sure to submit a patch. !DSPAM:47bf361642361264652389! - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Apache2 and tomcat5.5
If you are running on Linux you may have problems using a 'plain' tomcat installation pointing at port 80. This is a system port and reserved for privileged access. You must 1. use some kind of redirection such as iptables and leave the tomcat mapping at 8080 OR 2 you must run tomcat as root THIS IS VERY BAD DON'T DO THIS OR 3. use something like jsvc and set the 'user' to tomcat after starting up as root. jsvc will start as root and bind to the port and then switch to the non-privileged tomcat user for normal operation. Regards Alan Chaney Hassan Schroeder wrote: On Wed, Feb 20, 2008 at 12:57 PM, elvberg [EMAIL PROTECTED] wrote: I've added to D-Link router Virtual Server List Name Private IP Protocol Schedule 87.227.4.194 192.168.0.135 TCP 80/80 always 87.227.4.194 192.168.0.135 TCP 8084/8084 always Why did you feel the need to change this, if you were able to connect to the instance of httpd before? And what's the 8084 for? But as already suggested, make sure that Tomcat's actually running and can be accessed locally; if not, check your startup logs. - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: deploy/undeploy probs with 6.0.14
I've seen the following causes: 1. Application not shutting down properly because threads still running. 2. Application holding on to system resources (files, database) (really another version of 1.) Try stopping the app using the manager and checking that the log says that the app is undeployed properly. Then do a kill -3 (if on linux) to view the stack trace. Or you can use JConsole to look at what threads are running with JMX. Regards Alan Holger Burde wrote: Hi; I have some problems to deploy/undeploy a jsf 1.2 application to tomcat 6.0.15. The usual way does not work. To undelpoy i have to 1 from tomcat manager stop the app 2 undeploy (if i use list apps after that step the app is still listed - the myapp dir in webapps is still there) 3 restart tomcat (now the app is gone from webapps) Sometimes i even have to repeat step 2-3 two times. deploying the app without restarting tomcat never worked but has to (required for this project). Deploying is similar hard - mostly i need a tomcat restart because if i drop it or deploy via tomcat manager the app does not start correctly (state false / deployment error). The application is about 21MB - the tomcat conf is pretty normal (almost unchanged). Two simple hello world testapps i wrote work as expceted. they deploy / undeply as expected. The application itself works ok if one gets beyound this hurdle. Any hints or tips were to look for to solve that problem are welcome ! PS The webapp was build with netbeans6 / jsf 1.2 and tomcat 6.0.14 used for development hb - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] !DSPAM:47b83e3c260821041662902! - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: managing user uploads best practices
Totally agree with everything brien says below. I also run a web site with a large number of media objects. I've been involved in filing system and media projects for many years both in research and production capacity. The slight increase in complexity of the solution to maintain the media objects outside the database is completely offset by the huge improvement in performance of the database. Also it is particularly worth stressing the backup advantages. If you have 10,000 users (not a large number these days) each with 5 images and/or one podcast you are going to have very, very large monolithic database backups which are either going to be in a binary form and thus very opaque or simply huge as sql dumps unless you separate the binary data. Another advantage is that it allows you to have a very scalable media server. The media server does not have to participate in the session. You can have a number of independent media servers who simply download files identified by an ID. The media server(s) don't have to be on the same box, platform or even in the same building. The issues of clustering simply go away (a media download is a single operation and thus does not benefit from clustering.) If you are running a large number of concurrent downloads, you only need a trivial load balancing front end server to direct requests at the media servers. If you require authentication to restrict access to the media then you may have a bit more work to do but it is not too difficult. So if you have a site with a lot of media, you can tune the application component to be small and responsive and the media delivery components to be simple and fast and optimizied for continuous download. brien colwell wrote: On the topic of DB versus filesystem for media, I prefer storing media in a filesystem and meta data in a DB. The advantages of storing large binary files outside of the DB are * Reduce contention in the DB -- it's doing so much * You have more control with a filesystem where your data goes -- e.g. you can have a disk for one type of data, and another disk for a different type * Filesystems are optimized to stream out data ... which I think makes sense That first point is really key. If you're serving data to a UI from the same database you're storing large files into, the whole experience is going to suffer. The best article I've read on this topic is http://mysqldatabaseadministration.blogspot.com/2008/01/i-will-not-blob.html The main scale issue I'm careful of is how many files I put per directory. For large amounts of files, I sometimes link directories into trees. I might be a little paranoid about this, but it seems to scale well. In terms of backup and security, I think a FS is easier to manage -- e.g. chmod and rsync on a cron job -- though you'll have to write more code and scripts. You also have to be careful of things like shell injection if you're running shell commands from your webserver. Anyway, hope that gives some help. I was also confused with this when I started writing DB backed apps. On Feb 9, 2008 4:58 PM, [EMAIL PROTECTED] wrote: Thanks for the suggestions! I like using the database for storage for it's easy maintenance and security, but marshalling a lot of binary data (like a large image library) adds a bit of overhead to the application. I'll look into pursuing a storage directory external to the webapp. -- Original message -- From: Johnny Kewl [EMAIL PROTECTED] --- HARBOR: http://coolharbor.100free.com/index.htm The most powerful application server on earth. The only real POJO Application Server. Making the Java dream come true. --- - Original Message - From: [EMAIL PROTECTED] To: users@tomcat.apache.org Sent: Friday, February 08, 2008 11:13 PM Subject: managing user uploads best practices Yes... outside. Its been a long long time now, vaguely remember struggling with Apache uploader then eventually getting all to work... Anyway... what I did is store the files in an Apache httpD folder, so I could spy on the uploads, and they available for viewing again. And whats cool is because Apache is also the load balancer in my case... can have lots of TC's doing their thing. I was making a kind of wiki thing for an estate agency... thats how I did it way back when... What's the current wisdom on managing user uploaded files to a web app that's deployed via a WAR? In other words, when the WAR is updated, the directory containing uploaded files would be wiped out. Do people save uploaded files outside of the web app root directory? Security issues with this? Do people not use auto-expanding WAR files and manage the deployment by hand? Do you not include the directory for uploaded files in the WAR (but create it at runtime) and then trust that the
Re: Application Realm in Tomcat
If you purpose is to find the roles in the database wouldn't it be better just to query the database? What kind of realm are you using? If its something like the 'memory' realm then you can just read the file. If its a RDBM then a few lines of JDBC code or the use of a persistence manager would work. Regards Alan Tim Funk wrote: Via the spec - you can't query all the roles a user has. But you can say request.isUserInRole(rolename) If you *need* access to the realm, things start to get ugly. You need to start coding against Tomcat internal specific classes. -Tim maux wrote: Hi, I am doing a Java code. This code have to access to the realm that an application in Tomcat is using, after that the code have to access to that realm and look for the roles that exist in that database. - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] !DSPAM:47ab5f13234141497319589! - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
mbeans-descriptor.dtd
Hi Where can I find the mbeans-descriptor.dtd? The documentation mentions a 'fulldocs' download but I can't seem to find that. Thanks in advance Alan Chaney - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: mbeans-descriptor.dtd
Bill Barker wrote: Got it, thanks very much! For Tomcat 6, you can get it at http://svn.apache.org/viewvc/tomcat/tc6.0.x/trunk/java/org/apache/tomcat/util/modeler/ For earlier Tomcat versions, you can get from common-modeler at http://commons.apache.org/downloads/download_modeler.cgi. - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Tomcat Performance
Unfortunately I think it is way more complicated than this. I think that Mladen Turk's article has a lot of very useful information about configuring Tomcat and I congratulate him on putting it together. However, I've spent some time recently working on some performance issues and I think that for any given installation you must consider a number of factors. These include: 1. The time it takes to prepare the data for delivery. 2. The way available resources are combined in the delivery of this data. 1. The database Where a database or some other persistence mechanism is involved the performance of the database can easily overwhelm almost all other considerations. Is the database local or remote? If local, the time taken transferring results from the database to the business layer may not be that significant but the cpu time and disk I/O spent running the query will immediately reduce the resources available and thus increase the response time of web requests. If remote then it is easy for the database to become a bottleneck for requests. Also the time transferring the data over the network becomes more significant and it is arithmetically added to the AART unless the data can be 'preread' and cached. How well designed are the queries? Are they subject to issues such as badly designed indexes which mean that as the data set grows query processing time responds exponentially? Has the object design been tested for performance - an ORM solution can save a lot of time in development but add significant 'hidden' costs. [Please note, I think ORMs are a great idea and always use them where possible but like all technology they have their drawbacks!] 2. The mix of the need for resources by the application. Issues to consider here include: Are sessions required, and the size of the session. This can also significantly impact clustered performance. It may be better to keep keys for information in the session and re-read the data rather than read data once at the beginning of the session. What processing is required in the business/web layer to structure the information? Is there significant XML processing (which can be very time intensive?) Is there significant EL processing on a page (which can be much slower than 'raw' java') My experience is that the only way to really assess the overall performance of a system is to instrument the system extensively and then monitor it in action. Doing this will sometimes reveal bottlenecks which you just didn't consider. Of course even then you must be careful of 'the Heisenberg effect'. One final point. In Mladen Turk's example he assumes that the full bitrate bandwidth of an Ethernet connection is available for useful data. From previous experience I have seen that the overhead of the protocol and framing information reduce the 100 Mbps to more like 70 Mbps which would change his max of 625 concurrent requests to about 440. Another network related issue is that actually most client 'last hop' connections are considerably slower than 100 Mbps. Where TCP/IP is involved the thread which is actually writing to the network interface will block until the *client* has read all the data and indicated that the transmission is successfully completed. In conclusion I think that if you apply two simple formulae to the design of a Tomcat based web application you may be shocked and surprised at the actual results unless you have very carefully analysed your design and investigated the factors which affect performance. Regards Alan Andrew Hole wrote: Hello I read an interesting document from Mladen Turk (with whom I want to speak directly, but I don't know direct contact) that there is a formula to calculate the number of concurrent request: http://people.apache.org/~mturk/docs/article/ftwai.html Calculating Load When determining the number of Tomcat servers that you will need to satisfy the client load, the first and major task is determining the Average Application Response Time (hereafter AART). As said before, to satisfy the user experience the application has to respond within half of second. The content received by the client browser usually triggers couple of physical requests to the Web server (e.g. images). The web page usually consists of html and image data, so client issues a series of requests, and the time that all this gets processed and delivered is called AART. To get most out of Tomcat you should limit the number of concurrent requests to 200 per CPU. So we can come with the simple formula to calculate the maximum number of concurrent connections a physical box can handle: 500 Concurrent requests = ( -- max 200 ) * Number of CPU's AART (ms) The other thing that you must care is the Network throughput between the Web server and Tomcat instances. This introduces a new variable called Average Application Response Size
