Re: tomcat incoming requests and thread usage
Its hard to say servlet threads return to pool, as soon as its done with the response. many things would go in between, as Caldarale said. u can try with few threads and really trace whats going with the service method. make sure, the last line of service method is reached -- at least u can be sure that the thread is done. --- Manivannan Palanichamy http://mani.gw.googlepages.com/index.html On 9/14/07, Caldarale, Charles R [EMAIL PROTECTED] wrote: From: Waseem Azhar [mailto:[EMAIL PROTECTED] Subject: tomcat incoming requests and thread usage Could sombody tell me how tomcat release/reclaim it threads after serving request. Threads return to the pool when the servlet/filter chain does its return. If threads are still busy, it's your webapps that are hanging on to them. Take a thread dump and find out where they're stuck. - 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] -- Manivannan.Palanichamy (@) Oracle.com http://mani.gw.googlepages.com/index.html
Threads in tomcat application.
Hi I need to design a web application that may use threads. Thats, the web application might have to read some 200 files from network. In order to speed up the process, I've decided to use threads/thread pooling. But, however I know it is not a good practice to use threads in a web/server application... Just want to know whether this will be a great impact in future.. Otherwise, do you suggest any alternative design for the above problem? Looking forward a quick reply :-) -- Manivannan Palanichamy http://mani.gw.googlepages.com/index.html
Re: Tomcat not starting properly.
which tomcat version are you using? can you also specify the value of PATH and CLASSPATH variables? -- Manivannan Palanichamy http://mani.gw.googlepages.com/index.html On 8/28/07, Potri Raaja [EMAIL PROTECTED] wrote: Hi, When I try to start my tomcat I am getting the following error, it is not getting started properly. HC-APACHE:~/jakarta-tomcat-5.0.28/bin # ./startup.sh Using CATALINA_BASE: /root/jakarta-tomcat-5.0.28 Using CATALINA_HOME: /root/jakarta-tomcat-5.0.28 Using CATALINA_TMPDIR: /root/jakarta-tomcat-5.0.28/temp Using JAVA_HOME: /root/j2sdk1.4.2 Exception in thread main java.lang.NoClassDefFoundError: HC-APACHE:~/jakarta-tomcat-5.0.28/bin # Can you please suggest me to overcome this error.Waiting for your favourable reply. Regards, Potri Raaja.M. -- View this message in context: http://www.nabble.com/Tomcat-not-starting-properly.-tf4341696.html#a12367812 Sent from the Tomcat - User mailing list archive at Nabble.com. - 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 (javac)compilation arguments
oh!
Then, let me put my question clear first..
My problem is: I am trying to install java tomcat on a server (redhat
linux, 64 bit), which runs on shared memory. I need to limit down java start
up memory, by passing arguments like $javac -J -Xmx118m $java -Xmx118m so
that the virtual machince starts, otherwise it is terminated.
So, I assume (yes, assumption only) I need to pass same arguments to tomcat,
so that it can start without any error (I also assume, tomcat uses javac and
java in an indirect way to compile run). So, can you tell me a way how i
pass those arguments to tomcat's javac java?
I am not able to start tomcat. it is throwing any exception/error but,
simply the prompt returns.
--
Manivannan Palanichamy
http://mani.gw.googlepages.com/index.html
On 8/26/07, Brian Munroe [EMAIL PROTECTED] wrote:
On 8/25/07, Manivannan Palanichamy [EMAIL PROTECTED]
wrote:
I need to pass javac (compilation) arguments to tomcat. Just as
JAVA_OPTS is
there for jvm arguments, is there any env var/ other ways to pass
arguments
to javac of tomcat?
Hum, 'javac of tomcat' - Do you mean the JSP Compiler, or do you
really mean javac, which is used when say, compiling Servlets?
I am not aware of an environment variable ala JAVA_OPTS. However, if
you are using Ant, you can add a compilearg as a nested element
within the javac element.
For example:
javac srcdir=${src.home}
destdir=${build.home}/WEB-INF/classes
debug=${compile.debug}
deprecation=${compile.deprecation}
optimize=${compile.optimize}
classpath refid=compile.classpath/
compilerarg value=-Xlint /
/javac
If this isn't what you were looking for, please advise.
-- brian
-
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Re: java.lang.NoClassDefFoundError
just do, jar -tvf MyJar.jar and see whether it lists the class. -- Manivannan Palanichamy http://mani.gw.googlepages.com/index.html On 8/25/07, Dave Sailer [EMAIL PROTECTED] wrote: it does. And if it didn't jar uf is broken, I would think. On Fri, 2007-08-24 at 15:20 -0600, Filip Hanik - Dev Lists wrote: better check your Jar to make sure it has the MyServletException.class file still in it. Filip Dave Sailer wrote: I have a webapp that is working but I wanted to update a servlet jar so: jar uf MyJar.jar net/whohah/portal/servlet/MyServlet.class cp MyJar.jar $CATALINA_HOME/webapps/ROOT/WEB-INF/lib No I get the exception shown below. I have MyServlet stripped down so the only imports are: import java.io.*; import javax.servlet.*; import javax.servlet.http.*; I can't see how replacing one servlet that has few dependencies is causing an unrelated NoClassDefFoundError. javax.servlet.ServletException: net/whohah/portal/exceptions/MyServletException org.apache.jasper.servlet.JspServlet.service(JspServlet.java:273) javax.servlet.http.HttpServlet.service(HttpServlet.java:803) root cause java.lang.NoClassDefFoundError: net/whohah/portal/exceptions/MyServletException java.lang.Class.getDeclaredConstructors0(Native Method) java.lang.Class.privateGetDeclaredConstructors(Class.java:2357) java.lang.Class.getConstructor0(Class.java:2671) java.lang.Class.newInstance0(Class.java:321) java.lang.Class.newInstance(Class.java:303) org.apache.jasper.servlet.JspServletWrapper.getServlet( JspServletWrapper.java:142) org.apache.jasper.servlet.JspServletWrapper.service( JspServletWrapper.java:311) org.apache.jasper.servlet.JspServlet.serviceJspFile( JspServlet.java:315) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265) javax.servlet.http.HttpServlet.service(HttpServlet.java:803) - 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] -- Manivannan.Palanichamy (@) Oracle.com http://mani.gw.googlepages.com/index.html
Tomcat (javac)compilation arguments
Hi, I need to pass javac (compilation) arguments to tomcat. Just as JAVA_OPTS is there for jvm arguments, is there any env var/ other ways to pass arguments to javac of tomcat? -- Manivannan Palanichamy http://mani.gw.googlepages.com/index.html
Re: Tomcat freezes up
What solution been found out for this problem? I am really a sufferer of this problem? I am thinking of entering a bug. But, the problem is, as Sebastiaan said, reproducing the bug. Let me work on this, or guys you can also help/guide/work on reproducing the bug. -- Manivannan Palanichamy http://mani.gw.googlepages.com/index.html On 8/16/07, Sebastiaan van Erk [EMAIL PROTECTED] wrote: It seems very unlikely to me that the problem is in the Tomcat code. It is very widely deployed and any deadlocks would be found relatively quickly unless you use a very obscure setup. Did you do any standard deadlock debugging? E.g., thread dumps and deadlock analysis when the freeze occurs, debug in eclipse with the sysdeo plugin and examine the state of your application when the freeze occurs... etc. Note that reporting a bug is not very useful when there is no information on how to reproduce the bug, you'll just get a WORKSFORME or NEEDINFO status on the bug. Regards, Sebastiaan Manivannan Palanichamy wrote: I posted the same question week back. People advised me to handle the resource safely, like freeing up the database connections after use, releasing file handles etc. I am very sure that I am doing that perfectly, but still my tomcat freezes over long run. I've seen this case in many instances. Is it an issue with tomcat thread handling? Because, in user applications, these freezing problems happen most of the time, because of poor thread handling. Better we enter a bug/ discuss this issue in tomcat developers forum. -- Manivannan.Palanichamy (@) Oracle.com http://mani.gw.googlepages.com/index.html
how to strip tomcat?
My laptop is having very low memory. I need to run minimal version of tomcat. (stripped version of tomcat, to avoid memory hogging). Can you guys give some tips on this -- like removing unnecessary jars enabling dynamic class/jar loading? (My requirement is just to run few jsp pages, to enter/retrieve some values to/from database, nothing else other than that) -- Manivannan Palanichamy http://mani.gw.googlepages.com/index.html
Re: Tomcat freezes up
I posted the same question week back. People advised me to handle the resource safely, like freeing up the database connections after use, releasing file handles etc. I am very sure that I am doing that perfectly, but still my tomcat freezes over long run. I've seen this case in many instances. Is it an issue with tomcat thread handling? Because, in user applications, these freezing problems happen most of the time, because of poor thread handling. Better we enter a bug/ discuss this issue in tomcat developers forum. -- Manivannan Palanichamy http://mani.gw.googlepages.com/index.html On 8/16/07, Garg, Apoorv [EMAIL PROTECTED] wrote: Best Regards, Apoorv _ From: Garg, Apoorv Sent: Thursday, August 16, 2007 9:14 AM To: 'users@tomcat.apache.org' Subject: Tomcat freezes up Hi, I am using Tomcat 5.5.17. I have noticed that at times Tomcat freezes up and stops responding to requests. The only way to come out of this mode is to restart Tomcat. There is no definite pattern to this behaviour. I will appreciate all the help. Thanks! Apoorv Garg Dematic Corp. USA Software Products Engineering, RD-4 507 Plymouth Ave NE Grand Rapids, MI 49505 Phone: 616-9135044 Fax: 616-9135024 E-mail: [EMAIL PROTECTED] DEMATIC l Creating Logistics Results
Re: java.net.BindException: Address already in use
On 8/11/07, Susan Richards [EMAIL PROTECTED] wrote: First, I just want to say that I sure appreciate all the help I am getting on this list and I don't deserve to even associate with highly intelligent beings such as yourselves. We shutdown and restart our tomcat 5.5.23 server nightly. Initially, a maintenance page for system backup gets copied and then it gets bounced with the shutdown.sh and startup.sh scripts. Since we upgraded last Friday, it's not always starting up. I see this message in the log: SEVERE: Error initializing endpoint java.net.BindException: Address already in use (errno:226):80 I've checked server.xml and I only have one connector using this port. Perhaps all the connections are not getting terminated when it shuts down? How do I fix this problem? How do I figure out what is the cause? Sometimes, I too faced this prob. I did a work around. Just grep for the tomcat process id. some thing like, ps -ax | grep 'endorsed' //an ugly grep to fetch tomcat process as you have got the process id now, kill the tomcat as, kill -9 [pid] Now start the tomcat. [also, make sure, you are not running a webserver already on port 80. if you are running any oracle server, probably it might be starting a apache webserver on 80, pl check] -- Manivannan.Palanichamy (@) Oracle.com http://mani.gw.googlepages.com/index.html
Re: Tomcat startup error
Proabably, you have wronly edited server.xml or tomcat-users.xml. Revert the changes or get fresh files then try again. On 8/8/07, R Y [EMAIL PROTECTED] wrote: I install tomcat 5.5 package on Ubuntu, it run server on port 8180 by default. I start Tomcat 5.5 by running /etc/init.d/tomcat script, it responses: * Starting Tomcat servlet engine tomcat5.5 [ OK ] but when check its running status, it is: * Tomcat servlet engine is not running. I have read all tomcat document , still can't find the reason why tomcat can't boot successfully, could anyone kindly give me a hint about that. thanks my server.xml http://pastebin.com/m411d5f59 [EMAIL PROTECTED] Here is my tomcat log: http://pastebin.com/m4177eae4 -- Manivannan.Palanichamy (@) Oracle.com http://mani.gw.googlepages.com/index.html
Re: Datasource Error
Set the connection url in database configuration xml file. Some thing like, parameter nameurl/name valuejdbc:mysql://localhost:3306/javatest?autoReconnect=true/value /parameter Refer to this page: http://tomcat.apache.org/tomcat-5.0-doc/jndi-datasource-examples-howto.html -- Manivannan.Palanichamy (@) Oracle.com http://mani.gw.googlepages.com/index.html On 8/7/07, Will Holmes [EMAIL PROTECTED] wrote: I am using Tomcat 5.5.9 on Windows XP I have created a resouce in the Tomcat server.xml file. I have configured the resource ref in the web.xml file. When my application access the datasource I get the following error: org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot create JDBC driver of class '' for connect URL 'null' Anyone have any ideas? Thanks in advance!! Will Holmes Programmer Analyst Fremont Insurance Company Ph: 231-924-0302 Ext. 145 E-Mail: [EMAIL PROTECTED] -- Manivannan.Palanichamy (@) Oracle.com http://mani.gw.googlepages.com/index.html
Re: Read and write inside WEB-INF
I too do the same thing; I am reading properties from a property file, thats under WEB-INF/classes directory. code is: InputStream in = getClass().getClassLoader().getResourceAsStream( sample.properties); Code is working fine. -- Manivannan.Palanichamy (@) Oracle.com http://mani.gw.googlepages.com/index.html On 7/14/07, Jacob Rhoden [EMAIL PROTECTED] wrote: Hi, I have seen a few apps do this now and I would like to do it, to have a configure page that read and writes a properties file somewhere inside the WEB-INF directory. That said, I have been researching and cant find out where, what is the correct way to find the location of your WEB-INF directory (or your apps directory for that matter). Best Regards, Jacob - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -- Manivannan.Palanichamy (@) Oracle.com http://mani.gw.googlepages.com/index.html
Re: How to replace jar which was already loaded?
Try manager url, http://localhost:8080/manager/reload?path=/app_name (app_name is your web application name. ). it will reload the specific application alone. You will be prompted for manager login, which you have already configured in tomcat/conf/tomcat-users.xml -- Manivannan.Palanichamy (@) Oracle.com http://mani.gw.googlepages.com/index.html On 7/10/07, santa T [EMAIL PROTECTED] wrote: Hi I have a worker.jar in my webapp. User could upload a new worker.jar replacing it. And I don't want to restart the tomcat. How can I implement this? Thanks. -- Manivannan.Palanichamy (@) Oracle.com http://mani.gw.googlepages.com/index.html
