Re: Should one process continue to grow on Linux???
For my experience, the Sun jdk 1.3.x on linux tend to grow infinitely with tomcat. Try out the IBM JDK 1.3.1 or the newest Sun 1.4.1 (for servers i use the IBM, it's seems more reliable and stable in its memory consumption). Regards, Jens Stutte Brandon CruzTo: Tomcat Users List bcruz@norvax[EMAIL PROTECTED] .comcc: Subject: Should one process continue to grow on 24/09/2002 Linux??? 01.25 Please respond to Tomcat Users List We are running tomcat 3.2.4 connected to Apache on Linux RedHat 7.1. We are using jdk1.3.1_01. Recently, we have noticed that one process continues to grow in the memory consumption and cpu usage. If we do not restart tomcat, the time this process shows to be running keeps getting bigger. This is not the parent process created on startup, it is one of the child processes. Is this normal, or do we need to start checking our code? Below is a sample output of the process, showing that is has been running for 27:49 minutes. root 17825 7.8 15.5 818396 77144 ? S13:10 27:49 /usr/java/jdk1.3.1_01/bin/i386/native_threads/java -Dtomcat.home=/usr Brandon -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
Re: Running class finalize method when stopping/restarting a WebApp
There is no way to ensure, that a finalize method is called. It depends on the JVM's GC implementation and has nothing to do with tomcat. If it's a servlet, you can override the destroy() method of the servlet class to close your connections. Or you make a class that implements HttpSessionBindingListener and put it into the session (depends on your connection architecture). Regards, Jens Stutte Oakleaf Admin Admin@oakleafconsulTo: '[EMAIL PROTECTED]' tancy.com [EMAIL PROTECTED] cc: 27/09/2002 15.20Subject: Running class finalize method when Please respond to stopping/restarting a WebApp Tomcat Users List Hi, I have an application scope class that is managing an Oracle connection cache to my database. The finalize method of this class is written to terminate all connections and close the connection cache. However, when I stop the webapp or restart it (using the manager app) the finalize of this class is not run everytime (about1 in every 3 times it does run), furthermore it seems to me that Tomcat is keeping a reference to the class as the garbage collector never closes it and Oracle DCD cannot terminate the connection as it thinks it is still alive. Can anyone tell me how to ensure the finalize method is run everytime the webapp is stopped/restarted or if there is any other way of doing the same thing ? Thanks in advance, Eddie -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
Re: Does closing a Connection variable and setting it to null close all ofthe ResultSet and Statements?
Unfortunately there are databases and JDBC combinations, that do not free database resources, if you do not explicitely close all result sets and statements. If i remember right, SAP DB was one of them (BTW, only problem i had with it, and easy to resolve). You may then run out of connections, because the database did not free the connection until there were open result sets. I am quite sure, that this may apply to other databases, too, and i got used to explicitely close everything (i wrote my own wrapper classes for connections and statements, which ease these tasks). Regards, Jens Stutte Glenn Nielsen [EMAIL PROTECTED]To: Tomcat Users List [EMAIL PROTECTED] ore.net cc: Subject: Re: Does closing a Connection variable and 28/08/2002 setting it to null close all of the ResultSet and 02.03Statements? Please respond to Tomcat Users List Per the javax.sql javadocs... When a Connection is closed it closes any open Statements. When a Statement is closed, it closes any open ResultSets. If you just dereference a connection (non connection pool) when the Connection is GC'd it is closed. If you use DBCP 1.0 as your connection pool it tracks Statements and ResultSets used by a connection. When you close the connection it will ensure the Statements and ResultSets still open for that Connection are closed. Regards, Glenn Michael Nicholson wrote: Well, I guess the subject line says it all. I'm having memory issues, and having read the OOM error messages on the list, I've checked and found some open and not being closed connections, so I'm going back and closing them all. The question is do I need to explicitly close/dereference (set to null) all statements and recordsets too? Right now the system takes about 4% of my available memory just for the beans in question, so I'm trying to minimize what I store so that I could conceptually have more than one user. Thanks in advance, Mike Nicholson -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
RE: Checking Tomcat's Memory
That's true, the adress space for each Win32 process is limited to 2GB (same on Linux? I would assume yes for the same processor architecture, but i do not know it). Another hint: If your applications are compatible with jdk 1.3, try out the IBM jdk. For me it works more stable and performant than the Sun jdks in a server environment both on Windows and Linux. For example the GC does not stop the whole JVM from time to time as with the Sun jdk. Regards, Jens Stutte Sexton, George To: Tomcat Users List gsexton@mhsof[EMAIL PROTECTED] tware.comcc: Subject: RE: Checking Tomcat's Memory 16/08/2002 01.01 Please respond to Tomcat Users List I really doubt it. I seem to recall that for Windows 32 bit applications the maximum address space of an application is 2GB. I would try reducing the second parameter to below 2GB and see what happens. I'm sure Sun has some boxes that could do this... -Original Message- From: Marinko, Jeff [mailto:[EMAIL PROTECTED]] Sent: 15 August, 2002 3:28 PM To: 'Tomcat Users List' Subject: RE: Checking Tomcat's Memory Ah, there it is! So I would add additional JVM Option Number X with the -server, -Xms, -Xmx parameters and change JVM Option Count to account for this. I've managed to change the VM heap size through editing the catalina.bat script, however I get the following: Error occurred during initialization of VM Could not reserve enough space for object heap when I try to set my parameters at -Xms1024m -Xmx3072m (currently running at 128m and 1024m). Are there any VMs out there that can handle this kind of memory (1+ gigs to start)? Thanks! -Original Message- From: Sexton, George [mailto:[EMAIL PROTECTED]] Sent: Thursday, August 15, 2002 1:20 PM To: Tomcat Users List Subject: RE: Checking Tomcat's Memory HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\ServiceName \Parameter s -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
RE: Login problem with reverse proxy
No, i have no concrete idea. My only doubt is, that the chain browser-proxy-tomcat must be involved, that is your redirect somehow gets executed over this chain, otherwise the problem would not exist. I think, there is an option to say, wether redirects should be executed via the browser or really internally, but i don't remember, where... Regards, Jens Stutte Barney Hamish Hamish.Barney@ect-teTo: 'Tomcat Users List' lecoms.de [EMAIL PROTECTED] cc: 09/08/2002 13.52 Subject: RE: Login problem with reverse proxy Please respond to Tomcat Users List Thanks Jens. I'm afraid that doesn't help with my specific problem. This is something to do with the forwarding of requests to the login page that Tomcat does internally. I'm not sure how I can avoid that in the way I design my application (if I want to use the built-in authentication method without modifying the way Tomcat handles realms). Do you know how I can deal with this specific problem? Thanks, Hamish -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] Sent: Friday, August 09, 2002 12:58 PM To: Tomcat Users List Subject: Re: Login problem with reverse proxy Sorry for the empty mail, i struggled with my Lotus client (who the heck creates a dialog box that defaults to Send when closing a modified mail without sending it ?)... I have a similar configuration here (slightly complicated due to the use of struts). You must follow some rules in your design, to be able to do this: - do not use browser redirects, but internal redirects. Or create dynamically JavaScript redirects on your pages (not very nice, i know). - use only relative URLs. Otherwise, especially if your application does not map to your proxys root directory but some subfolder, nothing will work. - if you use struts, be aware of some tags, that create absolut URL pathes (the form tag for example). I extended and overrided some of these tags in order to create relative pathes (the struts community has decided, to not treat this issue). Hence, the most existing J2EE applications, that are not designed and tested for a similar environment, most likely won't work without modifications. Regards, Jens Stutte JensStutte@qu idinfo.itTo: Tomcat Users List [EMAIL PROTECTED] 09/08/2002 cc: 11.46Subject: Re: Login problem with reverse proxy Please respond to Tomcat Users List Barney Hamish Hamish.Barney@ect-teTo: '[EMAIL PROTECTED]' lecoms.de [EMAIL PROTECTED] cc: 09/08/2002 11.32 Subject: Login problem with reverse proxy Please respond to Tomcat Users List Hi, I'm using tomcat 3.2 with form based login and an apache reverse proxy to filter requests to the webserver. When tomcat issues the redirect to the login page the users are sent directly to the webserver not the reverse proxy. As the webserver is not directly accessable they are unable to request the log-in page. Is anyone aware of a way I can configure tomcat and or the reverse proxy to make this set-up work? More info: -Internet-- | Reverse Proxy | Private Net | Webserver (with Tomcat) When a request for a secure resource is sent to the reverse proxy, it forwards that request to the webserver. If the user is not logged-in tomcat tries to redirect the user to the login form. In that redirect Tomcat apparently includes the IP address of the server upon which it is currently residing. The reverse proxy forwards the webserver's response to the client. When the client tries to request the log-in page from the directly from the webserver it is unable to reach the webserver. Hamish -- To unsubscribe, e-mail
Re: Login problem with reverse proxy
Barney Hamish Hamish.Barney@ect-teTo: '[EMAIL PROTECTED]' lecoms.de [EMAIL PROTECTED] cc: 09/08/2002 11.32 Subject: Login problem with reverse proxy Please respond to Tomcat Users List Hi, I'm using tomcat 3.2 with form based login and an apache reverse proxy to filter requests to the webserver. When tomcat issues the redirect to the login page the users are sent directly to the webserver not the reverse proxy. As the webserver is not directly accessable they are unable to request the log-in page. Is anyone aware of a way I can configure tomcat and or the reverse proxy to make this set-up work? More info: -Internet-- | Reverse Proxy | Private Net | Webserver (with Tomcat) When a request for a secure resource is sent to the reverse proxy, it forwards that request to the webserver. If the user is not logged-in tomcat tries to redirect the user to the login form. In that redirect Tomcat apparently includes the IP address of the server upon which it is currently residing. The reverse proxy forwards the webserver's response to the client. When the client tries to request the log-in page from the directly from the webserver it is unable to reach the webserver. Hamish -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
Re: Login problem with reverse proxy
Sorry for the empty mail, i struggled with my Lotus client (who the heck creates a dialog box that defaults to Send when closing a modified mail without sending it ?)... I have a similar configuration here (slightly complicated due to the use of struts). You must follow some rules in your design, to be able to do this: - do not use browser redirects, but internal redirects. Or create dynamically JavaScript redirects on your pages (not very nice, i know). - use only relative URLs. Otherwise, especially if your application does not map to your proxys root directory but some subfolder, nothing will work. - if you use struts, be aware of some tags, that create absolut URL pathes (the form tag for example). I extended and overrided some of these tags in order to create relative pathes (the struts community has decided, to not treat this issue). Hence, the most existing J2EE applications, that are not designed and tested for a similar environment, most likely won't work without modifications. Regards, Jens Stutte JensStutte@qu idinfo.itTo: Tomcat Users List [EMAIL PROTECTED] 09/08/2002 cc: 11.46Subject: Re: Login problem with reverse proxy Please respond to Tomcat Users List Barney Hamish Hamish.Barney@ect-teTo: '[EMAIL PROTECTED]' lecoms.de [EMAIL PROTECTED] cc: 09/08/2002 11.32 Subject: Login problem with reverse proxy Please respond to Tomcat Users List Hi, I'm using tomcat 3.2 with form based login and an apache reverse proxy to filter requests to the webserver. When tomcat issues the redirect to the login page the users are sent directly to the webserver not the reverse proxy. As the webserver is not directly accessable they are unable to request the log-in page. Is anyone aware of a way I can configure tomcat and or the reverse proxy to make this set-up work? More info: -Internet-- | Reverse Proxy | Private Net | Webserver (with Tomcat) When a request for a secure resource is sent to the reverse proxy, it forwards that request to the webserver. If the user is not logged-in tomcat tries to redirect the user to the login form. In that redirect Tomcat apparently includes the IP address of the server upon which it is currently residing. The reverse proxy forwards the webserver's response to the client. When the client tries to request the log-in page from the directly from the webserver it is unable to reach the webserver. Hamish -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
Re: memory usage (longish)
I cannot help you on the real problem, but i think both kinds of error are the same. The missing memory in your free output seems to be gone into linux' file system buffers and cache (cache: 1082072, nearly 1GB). So almost every file on your hard drive most likely has been cached ;-). If any other real process needs memory, linux automatically reduces its cache. So don't worry too much about low memory, until the cache usage is high in the output of free. I don't think, that this is a tomcat issue, but a jvm problem. On our servers we usually use the IBM jdk 1.3, which for my experience is more stable in a server environment (while for client applications with swing i always use a sun jdk) and does not produce these annoying server stops on garbage collection, if your application uses many little objects. It uses more memory on startup of the server, but then usually grows slower. Jens Stutte Simon Juden Simon.Juden@ProQuestATo: '[EMAIL PROTECTED]' lison.com[EMAIL PROTECTED] cc: 08/07/2002 12.04 Subject: memory usage (longish) Please respond to Tomcat Users List Got a funny problem with memory usage. Initially assumed likely to be a linux issue. Had the problem on RedHat 6.2, upgraded to RedHat 7.3, still have the problem. Not sure now if it's a linux or tomcat issue. Set-up/environment: Red Hat (now 7.3, with ext3), 1xi686 processor, 1.5Gb memory, Apache 1.3.26, Tomcat 3.2.4, JVM 1.3.1_01 (for the curious there are plans to upgrade these latter three elements but not yet). There are four of these in a webserver farm (hardware-accelerated SSL and loadbalancing happens before traffic gets near the farm). The problem happens on two of the four boxes occasionally, on one fairly often and on the fourth almost every other day. There are two ways the problem manifests itself. The most usual is as follows. Run webapp in tomcat (max heap size set to 500Mb). After some time Tomcat falls over with a an OutOfMemoryError. When it does this it is only using about 150Mb total (so in particular heap well under 500mb max) reported under ps, top etc. However the box reports all but a few megs of the 1.5Gb in use. It reports all this as still in use when every single java process (and every process my clients wrote) is shut down. There's about 60 Mb-worth of usage from the CPU processes and that's all I can account for. There is virtually no swap space usage though there's plenty available. The output of free (after tomcat and all non-canonical processes shut down) is: [root@prodfarm3 logs]# free total used free sharedbuffers cached Mem: 15480841351560 196524 0 1069001082072 -/+ buffers/cache: 1625881385496 Swap: 538136 0 538136 Load averages are not high throughout any of this (1.6-1.7 or so). I know the DMA can take memory (but surely not this much and not for so long). I can't for the life of me think what could be using all the rest. The other way the problem manifests itself is that Tomcat falls over with an OutOfMemoryError but there are still several hundred megs still available on the linux box. The webapp does not allocate huge objects - I can fully load it on the test box with a bunch of (robot) users and it uses about 200 megs or so. So how it finds itself out of memory in this instance I don't know. I'm not sure if this is the same problem or a different one. I've written a few robots and bombarded a test box (identical configuration, except less physical memory, only 250Mb) with a bunch of concurrent user sessions. Different phenomena totally: load average soars (to about 8-9) but java correctly handles its memory and the thing doesn't die. However after an extended run turning tomcat off again leaves 248 of 250Mb reported in use (but this doesn't seem to be a problem when rerunning stuff). But my point is this isn't happening because
Re: Property file for a WAR
I don't think, you can change a property file at runtime, because the java class loaders usually cache classes and other resources during runtime. Without at least an application reload the changes won't be active. Application specific configurations i usually put into a properties file situated in WEB-INF/classes, in that way at least i can modify it after the war has been unpacked and restart the application. Jens Stutte Søren Neigaard s.neigaard@mobilTo: [EMAIL PROTECTED] ethink.dk cc: Subject: Property file for a WAR 03/07/2002 13.51 Please respond to Tomcat Users List Hi If I want to have a property file for my application, and I must be able to edit this file at runtime, where should I place it, and how do I now on runtime where it is placed (as I have no idea where the WAR file will be placed)? How do you guys do it, it must be common problem :) Med venlig hilsen/Best regards Søren Neigaard System Architect Mobilethink A/S Arosgaarden Åboulevarden 23, 5.sal DK - 8000 Århus C Telefon: +45 86207800 Direct: +45 86207810 Fax: +45 86207801 Email: [EMAIL PROTECTED] Web: www.mobilethink.dk -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
