Re: important help
Either way, you want to take a HARD look at what you're doing where this code explodes. Make sure it's doing what you want to do. This isn't either a Tomcat or even a JVM problem. It's a big alert that something is basically wrong here. If this is easily reproducible with a single request, then you have some serious architecture issues, I would think. Thinking about heap size, overhead, code size, etc, and with a 64MB heap, you still have a LOT of room left over, particularly for what 99% of people do with servlets. Now, perhaps your particular application is really different from everyone else, but if this is a problem easily reporduced by a single transaction (versus an issue related to system load), then playing with the heap is probably not going to help you. BTW, does it bother anyone else that this NROptions class is pushing 5000 lines long? I'm certainly not innocent of such horrors, as we have a couple as well (badly factored Utility classes, mostly), but that alone, to me, is red flag as well. Finally, it looks to me that this user is sucking in an enormous table from some data source. Good Luck! Regards, Will Hartung ([EMAIL PROTECTED]) - Original Message - From: "Shapira, Yoav" <[EMAIL PROTECTED]> Sent: Friday, August 02, 2002 10:30 AM Hi, Try java -X to see all the java pseudo-unsupported options ;) The default heap is 64M. You want to add -XmxNm where N is the maximum number of megabytes you need, e.g. -Xmx512m for 512MB. For tomcat, you will want to add this as a JAVA_OPTS setting. See the %CATALINA_HOME/bin/catalina.sh file. Yoav Shapira Millennium ChemInformatics >-Original Message- >From: Anil Garg [mailto:[EMAIL PROTECTED]] >Sent: Friday, August 02, 2002 1:19 PM >To: Tomcat Users List >Cc: [EMAIL PROTECTED] >Subject: Re: important help > >thanx for ur mail.. >could u plz tell me: > > >> If you are unable to re-architect your application to consume less memory >> or free memory up, you can try upgrading to JDK 1.4.x (which has a better >> garbage collector) >How to check which version of jdk is on my machine.(i hope you wont mind >questions too trivial for u) >>or check out the options to increase heap and thread >> stack size in the JVM ( run 'java -X' from the command line for the >> options) > >How can i check the current heap size set and how can i chage it *on unix >machine* > >thanx >anil >> >> Cheers, >> Michael >> >> - Original Message - >> From: "Anil Garg" <[EMAIL PROTECTED]> >> To: <[EMAIL PROTECTED]> >> Sent: Friday, August 02, 2002 12:26 PM >> Subject: important help >> >> >> please see the following error..and tell me on what lines should i start >> thinking. This error is coming on a particular users machine ..and doesnt >> come at other locations: >> >> >> Error: 500 >> >>Location: /servlet/NROptions >> >>Internal Servlet Error: >> >>java.lang.OutOfMemoryError: >> >> at >> java.lang.StringBuffer.expandCapacity(StringBuffer.java) >> >> at java.lang.StringBuffer.append(StringBuffer.java) >> >> at NRConfig.getMonths(NRConfig.java:4760) >> >> at NRConfig.printChartTimes(NRConfig.java:3732) >> >> at NRConfig.getDLTinfo(NRConfig.java:347) >> >> at NROptions.ListOptions(NROptions.java:426) >> >> at NROptions.doGet(NROptions.java:29) >> >> at >> javax.servlet.http.HttpServlet.service(HttpServlet.java:740) >> >> at >> javax.servlet.http.HttpServlet.service(HttpServlet.java:853) >> >> at >> org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:405) >> >> at >> org.apache.tomcat.core.Handler.service(Handler.java:287) >> >> at >> org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372) >> >> at >> org.apache.tomcat.core.ContextManager.internalService(ContextManager.jav >> a:812) >> at >> org.apache.tomcat.core.ContextManager.service(ContextManager.java:758) >> >> at >> org.apache.tomcat.service.connector.Ajp13ConnectionHandler.processConnec >> tion(Ajp13ConnectionHandler.java:160) >> at >> org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416 >> ) >> at >> org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:50 >> 1) >> at java.lang.Thread.
RE: important help
Hi, Try java -X to see all the java pseudo-unsupported options ;) The default heap is 64M. You want to add -XmxNm where N is the maximum number of megabytes you need, e.g. -Xmx512m for 512MB. For tomcat, you will want to add this as a JAVA_OPTS setting. See the %CATALINA_HOME/bin/catalina.sh file. Yoav Shapira Millennium ChemInformatics >-Original Message- >From: Anil Garg [mailto:[EMAIL PROTECTED]] >Sent: Friday, August 02, 2002 1:19 PM >To: Tomcat Users List >Cc: [EMAIL PROTECTED] >Subject: Re: important help > >thanx for ur mail.. >could u plz tell me: > > >> If you are unable to re-architect your application to consume less memory >> or free memory up, you can try upgrading to JDK 1.4.x (which has a better >> garbage collector) >How to check which version of jdk is on my machine.(i hope you wont mind >questions too trivial for u) >>or check out the options to increase heap and thread >> stack size in the JVM ( run 'java -X' from the command line for the >> options) > >How can i check the current heap size set and how can i chage it *on unix >machine* > >thanx >anil >> >> Cheers, >> Michael >> >> - Original Message - >> From: "Anil Garg" <[EMAIL PROTECTED]> >> To: <[EMAIL PROTECTED]> >> Sent: Friday, August 02, 2002 12:26 PM >> Subject: important help >> >> >> please see the following error..and tell me on what lines should i start >> thinking. This error is coming on a particular users machine ..and doesnt >> come at other locations: >> >> >> Error: 500 >> >>Location: /servlet/NROptions >> >>Internal Servlet Error: >> >>java.lang.OutOfMemoryError: >> >> at >> java.lang.StringBuffer.expandCapacity(StringBuffer.java) >> >> at java.lang.StringBuffer.append(StringBuffer.java) >> >> at NRConfig.getMonths(NRConfig.java:4760) >> >> at NRConfig.printChartTimes(NRConfig.java:3732) >> >> at NRConfig.getDLTinfo(NRConfig.java:347) >> >> at NROptions.ListOptions(NROptions.java:426) >> >> at NROptions.doGet(NROptions.java:29) >> >> at >> javax.servlet.http.HttpServlet.service(HttpServlet.java:740) >> >> at >> javax.servlet.http.HttpServlet.service(HttpServlet.java:853) >> >> at >> org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:405) >> >> at >> org.apache.tomcat.core.Handler.service(Handler.java:287) >> >> at >> org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372) >> >> at >> org.apache.tomcat.core.ContextManager.internalService(ContextManager.jav >> a:812) >> at >> org.apache.tomcat.core.ContextManager.service(ContextManager.java:758) >> >> at >> org.apache.tomcat.service.connector.Ajp13ConnectionHandler.processConnec >> tion(Ajp13ConnectionHandler.java:160) >> at >> org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416 >> ) >> at >> org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:50 >> 1) >> at java.lang.Thread.run(Thread.java) >> >> >> >> >> >> >> This is really important to me.. >> i hope to get some mails which will let me analyse the problem well. >> regards >> anil >> PS:i am newbie to java and tomcat >> >> >> >> >> -- >> To unsubscribe, e-mail: ><mailto:[EMAIL PROTECTED]> >> For additional commands, e-mail: ><mailto:[EMAIL PROTECTED]> >> > > >-- >To unsubscribe, e-mail: <mailto:tomcat-user- >[EMAIL PROTECTED]> >For additional commands, e-mail: <mailto:tomcat-user- >[EMAIL PROTECTED]> -- To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> For additional commands, e-mail: <mailto:[EMAIL PROTECTED]>
Re: important help
thanx for ur mail.. could u plz tell me: > If you are unable to re-architect your application to consume less memory > or free memory up, you can try upgrading to JDK 1.4.x (which has a better > garbage collector) How to check which version of jdk is on my machine.(i hope you wont mind questions too trivial for u) >or check out the options to increase heap and thread > stack size in the JVM ( run 'java -X' from the command line for the > options) How can i check the current heap size set and how can i chage it *on unix machine* thanx anil > > Cheers, > Michael > > - Original Message - > From: "Anil Garg" <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]> > Sent: Friday, August 02, 2002 12:26 PM > Subject: important help > > > please see the following error..and tell me on what lines should i start > thinking. This error is coming on a particular users machine ..and doesnt > come at other locations: > > > Error: 500 > >Location: /servlet/NROptions > >Internal Servlet Error: > >java.lang.OutOfMemoryError: > > at > java.lang.StringBuffer.expandCapacity(StringBuffer.java) > > at java.lang.StringBuffer.append(StringBuffer.java) > > at NRConfig.getMonths(NRConfig.java:4760) > > at NRConfig.printChartTimes(NRConfig.java:3732) > > at NRConfig.getDLTinfo(NRConfig.java:347) > > at NROptions.ListOptions(NROptions.java:426) > > at NROptions.doGet(NROptions.java:29) > > at > javax.servlet.http.HttpServlet.service(HttpServlet.java:740) > > at > javax.servlet.http.HttpServlet.service(HttpServlet.java:853) > > at > org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:405) > > at > org.apache.tomcat.core.Handler.service(Handler.java:287) > > at > org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372) > > at > org.apache.tomcat.core.ContextManager.internalService(ContextManager.jav > a:812) > at > org.apache.tomcat.core.ContextManager.service(ContextManager.java:758) > > at > org.apache.tomcat.service.connector.Ajp13ConnectionHandler.processConnec > tion(Ajp13ConnectionHandler.java:160) > at > org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416 > ) > at > org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:50 > 1) > at java.lang.Thread.run(Thread.java) > > > > > > > This is really important to me.. > i hope to get some mails which will let me analyse the problem well. > regards > anil > PS:i am newbie to java and tomcat > > > > > -- > 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: important help
This is more of a problem with the way your application is architected, rather than Tomcat. The java.lang.OutOfMemoryError occurs when the JVM cannot allocate any space for a new object, and the garbage collector cannot collect any unused heap space. That's is the low-level reason the StringBuffer is blowing up. In the file NRConfig, method getMonths(), line 4760, you are doing some string operation and that is causing the Error to be thrown. If you are unable to re-architect your application to consume less memory or free memory up, you can try upgrading to JDK 1.4.x (which has a better garbage collector) or check out the options to increase heap and thread stack size in the JVM ( run 'java -X' from the command line for the options) Cheers, Michael - Original Message - From: "Anil Garg" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Friday, August 02, 2002 12:26 PM Subject: important help please see the following error..and tell me on what lines should i start thinking. This error is coming on a particular users machine ..and doesnt come at other locations: Error: 500 Location: /servlet/NROptions Internal Servlet Error: java.lang.OutOfMemoryError: at java.lang.StringBuffer.expandCapacity(StringBuffer.java) at java.lang.StringBuffer.append(StringBuffer.java) at NRConfig.getMonths(NRConfig.java:4760) at NRConfig.printChartTimes(NRConfig.java:3732) at NRConfig.getDLTinfo(NRConfig.java:347) at NROptions.ListOptions(NROptions.java:426) at NROptions.doGet(NROptions.java:29) at javax.servlet.http.HttpServlet.service(HttpServlet.java:740) at javax.servlet.http.HttpServlet.service(HttpServlet.java:853) at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:405) at org.apache.tomcat.core.Handler.service(Handler.java:287) at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372) at org.apache.tomcat.core.ContextManager.internalService(ContextManager.jav a:812) at org.apache.tomcat.core.ContextManager.service(ContextManager.java:758) at org.apache.tomcat.service.connector.Ajp13ConnectionHandler.processConnec tion(Ajp13ConnectionHandler.java:160) at org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416 ) at org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:50 1) at java.lang.Thread.run(Thread.java) This is really important to me.. i hope to get some mails which will let me analyse the problem well. regards anil PS:i am newbie to java and tomcat -- To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> For additional commands, e-mail: <mailto:[EMAIL PROTECTED]>
Re: important help
i would like to add more... i am not able to reproduce the errorhow can i reproduce it.. if i dint provide the sufficinet information u need plz tell me. regards anil - Original Message - From: "Anil Garg" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Friday, August 02, 2002 12:26 PM Subject: important help please see the following error..and tell me on what lines should i start thinking. This error is coming on a particular users machine ..and doesnt come at other locations: Error: 500 Location: /servlet/NROptions Internal Servlet Error: java.lang.OutOfMemoryError: at java.lang.StringBuffer.expandCapacity(StringBuffer.java) at java.lang.StringBuffer.append(StringBuffer.java) at NRConfig.getMonths(NRConfig.java:4760) at NRConfig.printChartTimes(NRConfig.java:3732) at NRConfig.getDLTinfo(NRConfig.java:347) at NROptions.ListOptions(NROptions.java:426) at NROptions.doGet(NROptions.java:29) at javax.servlet.http.HttpServlet.service(HttpServlet.java:740) at javax.servlet.http.HttpServlet.service(HttpServlet.java:853) at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:405) at org.apache.tomcat.core.Handler.service(Handler.java:287) at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372) at org.apache.tomcat.core.ContextManager.internalService(ContextManager.jav a:812) at org.apache.tomcat.core.ContextManager.service(ContextManager.java:758) at org.apache.tomcat.service.connector.Ajp13ConnectionHandler.processConnec tion(Ajp13ConnectionHandler.java:160) at org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416 ) at org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:50 1) at java.lang.Thread.run(Thread.java) This is really important to me.. i hope to get some mails which will let me analyse the problem well. regards anil PS:i am newbie to java and tomcat -- To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> For additional commands, e-mail: <mailto:[EMAIL PROTECTED]>
important help
please see the following error..and tell me on what lines should i start thinking. This error is coming on a particular users machine ..and doesnt come at other locations: Error: 500 Location: /servlet/NROptions Internal Servlet Error: java.lang.OutOfMemoryError: at java.lang.StringBuffer.expandCapacity(StringBuffer.java) at java.lang.StringBuffer.append(StringBuffer.java) at NRConfig.getMonths(NRConfig.java:4760) at NRConfig.printChartTimes(NRConfig.java:3732) at NRConfig.getDLTinfo(NRConfig.java:347) at NROptions.ListOptions(NROptions.java:426) at NROptions.doGet(NROptions.java:29) at javax.servlet.http.HttpServlet.service(HttpServlet.java:740) at javax.servlet.http.HttpServlet.service(HttpServlet.java:853) at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:405) at org.apache.tomcat.core.Handler.service(Handler.java:287) at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372) at org.apache.tomcat.core.ContextManager.internalService(ContextManager.jav a:812) at org.apache.tomcat.core.ContextManager.service(ContextManager.java:758) at org.apache.tomcat.service.connector.Ajp13ConnectionHandler.processConnec tion(Ajp13ConnectionHandler.java:160) at org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416 ) at org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:50 1) at java.lang.Thread.run(Thread.java) This is really important to me.. i hope to get some mails which will let me analyse the problem well. regards anil PS:i am newbie to java and tomcat
important: help needed with servlets path
(apache 1.3.12 tomcat 3.3) As seen in the doc, an url path can be sliced in context path + servlet path + path info what's not said is that once the context path is matched, the servlet path must contain "/servlet/" for the servlet path to be interpreted as a servlet! Actually I use jserv and I have the following directive ApJServMount /script /java and any url matching http://host/script/* is a servlet I *have to* do the same thing with mod_jk I have ~160 virtual hosts and 6500 servlets, so I can't name them all in a web.xml file This could be done with Tomcat3.2 in which one could change the /servlet/ prefix with anything (prefix="/" for me) in the help -- mathieu perrenoud [iis]
