Re: Fwd: frequent Class unloading/classnotfound problem
Hi Chris/All, Actually we are getting Exception-Servlet execution threw an exception Exception Cause-java.lang.NoClassDefFoundError: We are running tomcat in centos. Web app initially running fine, and in the high load time this error is happeningo some of the class files randomly. Is there any relation between max-open-files in linux and NoClassDefFoundError in runtime. Arvind S Many of lifes failure are people who did not realize how close they were to success when they gave up. -Thomas Edison On Mon, Apr 11, 2011 at 8:24 PM, Christopher Schultz ch...@christopherschultz.net wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Arvind, On 4/11/2011 2:04 AM, S Arvind wrote: Attached the screenshot of the stacktrace for additional details. This list strips most attachments, including screenshots. How about copy/paste the text? To my knowledge, Tomcat will not unload any classes other than possibly JSPs. If you are talking about a standard POJO, then Tomcat should not be interfering with them at all. Are you using RMI or some other process that involves object serialization? If you have mismatched object class versions, you can have weird things like this happen. - -chris -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.10 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAk2jFjQACgkQ9CaO5/Lv0PBQswCcCjygCcMGHa2icXbMuW/gPMrH W5IAnjaevcBw4w1dWJqJfch5kOcIJW6Y =3Ndh -END PGP SIGNATURE- - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Fwd: frequent Class unloading/classnotfound problem
Chris, The stack trace at the error moment requestURI-/TempContext/jsp/QuickLoginAction Exception-Servlet execution threw an exception Exception Cause-java.lang.NoClassDefFoundError: com/X/hcare/actions/QuickLoginModel javax.servlet.ServletException: Servlet execution threw an exception at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:313) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at com..hcare.design.RequestContextFilter.doFilter(RequestContextFilter.java:75) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:630) at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:436) at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:374) at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:302) at com..ForwardServlet.yForward.performAction(yForward.java:51) at com..ForwardServlet.yForward.doPost(yForward.java:32) at javax.servlet.http.HttpServlet.service(HttpServlet.java:637) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:568) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447) at java.lang.Thread.run(Thread.java:619) Caused by: java.lang.NoClassDefFoundError: com//hcare/actions/QuickLoginModel at com..hcare.actions.QuickLoginActionNew.performAction(QuickLoginActionNew.java:120) at com..hcare.actions.QuickLoginActionNew.doPost(QuickLoginActionNew.java:57) at javax.servlet.http.HttpServlet.service(HttpServlet.java:637) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) ... 25 more Arvind S Many of lifes failure are people who did not realize how close they were to success when they gave up. -Thomas Edison On Thu, Apr 14, 2011 at 4:11 PM, S Arvind arvindw...@gmail.com wrote: Hi Chris/All, Actually we are getting Exception-Servlet execution threw an exception Exception Cause-java.lang.NoClassDefFoundError: We are running tomcat in centos. Web app initially running fine, and in the high load time this error is happeningo some of the class files randomly. Is there any relation between max-open-files in linux and NoClassDefFoundError in runtime. Arvind S Many of lifes failure are people who did not realize how close they were to success when they gave up. -Thomas Edison On Mon, Apr 11, 2011 at 8:24 PM, Christopher Schultz ch...@christopherschultz.net wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Arvind, On 4/11/2011 2:04 AM, S Arvind wrote: Attached the screenshot of the stacktrace for additional details. This list strips most attachments, including screenshots. How about copy/paste the text? To my knowledge, Tomcat will not unload any classes other than possibly JSPs. If you are talking about a standard POJO, then Tomcat should not be interfering with them at all. Are you using RMI or some other process that involves object serialization? If you have mismatched object class versions, you can have weird things like this happen. - -chris -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.10 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAk2jFjQACgkQ9CaO5/Lv0PBQswCcCjygCcMGHa2icXbMuW/gPMrH W5IAnjaevcBw4w1dWJqJfch5kOcIJW6Y =3Ndh -END PGP SIGNATURE-
RE: Fwd: frequent Class unloading/classnotfound problem
From: S Arvind [mailto:arvindw...@gmail.com] Subject: Re: Fwd: frequent Class unloading/classnotfound problem Exception Cause-java.lang.NoClassDefFoundError: com/X/hcare/actions/QuickLoginModel The usual cause is either the class really doesn't exist, or that it exists in more than place. Make sure it's not in multiple locations of a given branch of the classloader tree. Also check for permissions on the one location it should be in. - 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
RE: Fwd: frequent Class unloading/classnotfound problem
From: S Arvind [mailto:arvindw...@gmail.com] Subject: Re: Fwd: frequent Class unloading/classnotfound problem Is there any relation between max-open-files in linux and NoClassDefFoundError in runtime. There certainly can be. Are your webapps failing to close files (including sockets) when they're done with them? - 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
Fwd: frequent Class unloading/classnotfound problem
Chris, Attached the screenshot of the stacktrace for additional details. Arvind S Many of lifes failure are people who did not realize how close they were to success when they gave up. -Thomas Edison -- Forwarded message -- From: S Arvind arvindw...@gmail.com Date: Sun, Apr 10, 2011 at 12:12 PM Subject: Re: frequent Class unloading/classnotfound problem To: Tomcat Users List users@tomcat.apache.org Chris, So when the request comes it is sending 404 status or class-not-found exception. --Can you give some specifics? Assume we have a class called Sample.class, so when trying to create the object it is giving classnotfound exception. Then i have to again compile the java in the runtime itself then only it works, thou the class file are present in the classes folder packages. seems like these classes becoming invisible to tomcat by some means. So what we do is reload the context/application from the tomcat manager and then it will work fine. --Do those same requests then respond the way you expect? No until i reload the context/app in tomcat manager or compile the corresponding java file. (isreloadable=true) . Which is the main problem in the production time. --What version of Tomcat are you running? Does this happen only under certain circumstances (high load? no load? when re-deploying a JSP, etc.) or does it happen all the time? Please post a full stack trace of any exception you have encountered. tomcat 6.0.20 . Cant surely tell that its happening in high load, as we found that independent to load of the system. There are weeks this didnt happen and also in some week it will happen for 5days and in few days lot too.. so we cant able to find the meaning behind its randomness. And unfortunately i missed the stack trace which ws generated, if it occurred in this week i will mail it instantly. And till now it didnt happen in the JSP file, it only happened in servlet or plain java class. Arvind S Many of lifes failure are people who did not realize how close they were to success when they gave up. -Thomas Edison On Fri, Apr 8, 2011 at 12:41 AM, Christopher Schultz ch...@christopherschultz.net wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Arvind, On 4/7/2011 9:32 AM, S Arvind wrote: Recently in our web application deployed in tomcat, some weird problem is raising very frequently. Some of the servlet http://www.coderanch.com/forums/f-7/Servlets or class in that web app http://en.wikipedia.org/wiki/Web_app are getting unloaded. Most folks on the list have heard of servlets and web apps, but thanks for the references. So when the request comes it is sending 404 status or class-not-found exception. Can you give some specifics? So what we do is reload the context/application from the tomcat manager and then it will work fine. Do those same requests then respond the way you expect? Searched lot but cant able to find solution to this unloading or classnotfound problem. Can anyone suggest me why this is happening. What version of Tomcat are you running? Does this happen only under certain circumstances (high load? no load? when re-deploying a JSP, etc.) or does it happen all the time? Please post a full stack trace of any exception you have encountered. - -chris -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.10 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAk2eDE0ACgkQ9CaO5/Lv0PCXtgCfdbe3a0zEkpVch2FDDKoD6P0a zQ8AoL9OGteRqgDWY/sWbYz1I1IrSEKh =oev/ -END PGP SIGNATURE- - 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: Fwd: frequent Class unloading/classnotfound problem
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Arvind, On 4/11/2011 2:04 AM, S Arvind wrote: Attached the screenshot of the stacktrace for additional details. This list strips most attachments, including screenshots. How about copy/paste the text? To my knowledge, Tomcat will not unload any classes other than possibly JSPs. If you are talking about a standard POJO, then Tomcat should not be interfering with them at all. Are you using RMI or some other process that involves object serialization? If you have mismatched object class versions, you can have weird things like this happen. - -chris -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.10 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAk2jFjQACgkQ9CaO5/Lv0PBQswCcCjygCcMGHa2icXbMuW/gPMrH W5IAnjaevcBw4w1dWJqJfch5kOcIJW6Y =3Ndh -END PGP SIGNATURE- - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
