This class is in WEB-INF/classes. I am pretty sure it has to be loaded by the classloader because it is a super class some major classes in the app. If it was not loaded, the entire app would not load.
It is my understanding that there are multiple classloaders though, and one could be loading this class and another could be running the app. I do not have a large amount of knowledge in the multiple classloader area though. Is this true? If so, is there a way to only have one classloader? Sorry for the late response. I was pulled off this task for a few weeks for something with more priority. Thank you for your help once again. Daniel Stephens wrote: > > Where is this class com.formos.toolkit.data.IPersis located? Is it in the > WEB-INF/classes directory? or in a JAR? I guess I would want to first make > sure the webapp classloaded loaded it up first. > > > > On 3/1/07, ddigmann <[EMAIL PROTECTED]> wrote: >> >> >> A note before I start: I have found quite a few people out there asking >> about >> this same question but have not found my solution. This might mean I >> have >> trouble with finding the correct search terms or something entirely >> different. >> >> The ultimate issue is that from time to time Tomcat (we are using v >> 5.0.28 >> ) >> throws an exception while starting which we think causes sessions to be >> lost >> for our various users every time we research Tomcat. This is an issue >> since >> we would like the users to not loose data and be required to restart >> whenever we need to restart the system. The exception is as follows: >> >> INFO: Starting Servlet Engine: Apache Tomcat/5.0.28 >> Mar 1, 2007 4:35:23 PM org.apache.catalina.core.StandardHost start >> INFO: XML validation disabled >> Mar 1, 2007 4:35:24 PM org.apache.catalina.session.StandardManager doLoad >> SEVERE: ClassNotFoundException while loading persisted sessions: >> java.lang.ClassNotFoundException: com.formos.toolkit.data.IPersistentDO >> java.lang.ClassNotFoundException: com.formos.toolkit.data.IPersistentDO >> at >> org.apache.catalina.loader.StandardClassLoader.loadClass( >> StandardClassLoader.java:854) >> at >> org.apache.catalina.loader.StandardClassLoader.loadClass( >> StandardClassLoader.java:721) >> at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319) >> at java.lang.Class.forName0(Native Method) >> at java.lang.Class.forName(Class.java:242) >> at >> java.io.ObjectInputStream.resolveProxyClass(ObjectInputStream.java:646) >> at >> java.io.ObjectInputStream.readProxyDesc(ObjectInputStream.java:1494) >> at >> java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1457) >> at >> java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1693) >> at >> java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1299) >> at >> java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1912) >> at >> java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1836) >> at >> java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1713) >> at >> java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1299) >> at java.io.ObjectInputStream.readObject(ObjectInputStream.java >> :339) >> at >> org.apache.catalina.session.StandardSession.readObject( >> StandardSession.java:1342) >> at >> org.apache.catalina.session.StandardSession.readObjectData( >> StandardSession.java:885) >> at >> org.apache.catalina.session.StandardManager.doLoad(StandardManager.java >> :416) >> at >> org.apache.catalina.session.StandardManager.load(StandardManager.java:343) >> at >> org.apache.catalina.session.StandardManager.start(StandardManager.java >> :657) >> at >> org.apache.catalina.core.ContainerBase.setManager(ContainerBase.java:499) >> at >> org.apache.catalina.startup.ContextConfig.managerConfig(ContextConfig.java >> :315) >> at >> org.apache.catalina.startup.ContextConfig.start(ContextConfig.java:635) >> at >> org.apache.catalina.startup.ContextConfig.lifecycleEvent( >> ContextConfig.java:216) >> at >> org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent( >> LifecycleSupport.java:119) >> at >> org.apache.catalina.core.StandardContext.start(StandardContext.java:4290) >> at >> org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1083) >> at >> org.apache.catalina.core.StandardHost.start(StandardHost.java:789) >> at >> org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1083) >> 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 >> :39) >> at >> sun.reflect.DelegatingMethodAccessorImpl.invoke( >> DelegatingMethodAccessorImpl.java:25) >> at java.lang.reflect.Method.invoke(Method.java:585) >> at >> org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:287) >> at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:425) >> Mar 1, 2007 4:35:25 PM org.apache.catalina.session.StandardManager start >> SEVERE: Exception loading sessions from persistent storage >> java.lang.ClassNotFoundException: com.formos.toolkit.data.IPersistentDO >> at >> org.apache.catalina.loader.StandardClassLoader.loadClass( >> StandardClassLoader.java:854) >> at >> org.apache.catalina.loader.StandardClassLoader.loadClass( >> StandardClassLoader.java:721) >> at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319) >> at java.lang.Class.forName0(Native Method) >> at java.lang.Class.forName(Class.java:242) >> at >> java.io.ObjectInputStream.resolveProxyClass(ObjectInputStream.java:646) >> at >> java.io.ObjectInputStream.readProxyDesc(ObjectInputStream.java:1494) >> at >> java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1457) >> at >> java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1693) >> at >> java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1299) >> at >> java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1912) >> at >> java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1836) >> at >> java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1713) >> at >> java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1299) >> at java.io.ObjectInputStream.readObject(ObjectInputStream.java >> :339) >> at >> org.apache.catalina.session.StandardSession.readObject( >> StandardSession.java:1342) >> at >> org.apache.catalina.session.StandardSession.readObjectData( >> StandardSession.java:885) >> at >> org.apache.catalina.session.StandardManager.doLoad(StandardManager.java >> :416) >> at >> org.apache.catalina.session.StandardManager.load(StandardManager.java:343) >> at >> org.apache.catalina.session.StandardManager.start(StandardManager.java >> :657) >> at >> org.apache.catalina.core.ContainerBase.setManager(ContainerBase.java:499) >> at >> org.apache.catalina.startup.ContextConfig.managerConfig(ContextConfig.java >> :315) >> at >> org.apache.catalina.startup.ContextConfig.start(ContextConfig.java:635) >> at >> org.apache.catalina.startup.ContextConfig.lifecycleEvent( >> ContextConfig.java:216) >> at >> org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent( >> LifecycleSupport.java:119) >> at >> org.apache.catalina.core.StandardContext.start(StandardContext.java:4290) >> at >> org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1083) >> at >> org.apache.catalina.core.StandardHost.start(StandardHost.java:789) >> at >> org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1083) >> 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 >> :39) >> at >> sun.reflect.DelegatingMethodAccessorImpl.invoke( >> DelegatingMethodAccessorImpl.java:25) >> at java.lang.reflect.Method.invoke(Method.java:585) >> at >> org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:287) >> at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:425) >> >> I have been given the task to fix this and have come across the magical >> world of <Context> and <Manager> which is where I think the solution >> lies. >> >> Prior to any work on this task our <Context> in server.xml was as >> follows: >> >> <Context path="/thisPath" reloadable="true" >> docBase="C:\devel\java\thisPath\context"/> >> >> This method as I understand it will default to the Standard Manager >> Implementation as described here: >> http://tomcat.apache.org/tomcat-5.0-doc/config/manager.html >> >> This method saves sessions but not in a manner of saving them once Tomcat >> has been restarted. The Persistent Manager Implementation sounds more >> like >> what I need to partake in. So I updated my server.xml to handle such a >> method. It now looks like this in the <Context>: >> >> <Context path="/thisPath" reloadable="true" >> docBase="C:\devel\java\thisPath\context"> >> <Manager >> className="org.apache.catalina.session.PersistentManager" >> saveOnRestart="true"> >> <Store >> className="org.apache.catalina.session.FileStore"/> >> </Manager> >> </Context> >> >> This method should save the sessions in a manner of FileStore (to disk) >> after Tomcat has be restarted. Here is where my current problem is. I >> think the sessions are being written just fine when I stop Tomcat. When >> I >> restart it, the log seems just fine (no unusual messages). Then when I >> start reusing the app for a session that should be saved, I get this >> exception: >> >> INFO: Server startup in 6859 ms >> Mar 1, 2007 4:22:31 PM org.apache.catalina.session.PersistentManagerBase >> swapIn >> SEVERE: Error deserializing Session A9B8C8714E8DC421692B63CA531873AD: >> java.lang.ClassNotFoundException: com.formos.toolkit.data.IPersistentDO >> Mar 1, 2007 4:22:31 PM org.apache.coyote.tomcat5.CoyoteAdapter service >> SEVERE: An exception or error occurred in the container during the >> request >> processing >> java.lang.IllegalStateException: Error deserializing Session >> A9B8C8714E8DC421692B63CA531873AD: java.lang.ClassNotFoundException: >> com.formos.toolkit.data.IPersis >> tentDO >> at >> org.apache.catalina.session.PersistentManagerBase.swapIn( >> PersistentManagerBase.java:805) >> at >> org.apache.catalina.session.PersistentManagerBase.findSession( >> PersistentManagerBase.java:629) >> at >> org.apache.coyote.tomcat5.CoyoteRequest.doGetSession(CoyoteRequest.java >> :2252) >> at >> org.apache.coyote.tomcat5.CoyoteRequest.getSession(CoyoteRequest.java >> :2116) >> at >> org.apache.coyote.tomcat5.CoyoteRequestFacade.getSession( >> CoyoteRequestFacade.java:526) >> at >> org.apache.catalina.authenticator.AuthenticatorBase.getSession( >> AuthenticatorBase.java:692) >> at >> org.apache.catalina.authenticator.AuthenticatorBase.getSession( >> AuthenticatorBase.java:675) >> at >> org.apache.catalina.authenticator.AuthenticatorBase.invoke( >> AuthenticatorBase.java:423) >> at >> org.apache.catalina.core.StandardValveContext.invokeNext( >> StandardValveContext.java:102) >> at >> org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java >> :520) >> at >> org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java >> :137) >> at >> org.apache.catalina.core.StandardValveContext.invokeNext( >> StandardValveContext.java:104) >> at >> org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java >> :118) >> at >> org.apache.catalina.core.StandardValveContext.invokeNext( >> StandardValveContext.java:102) >> at >> org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java >> :520) >> at >> org.apache.catalina.core.StandardEngineValve.invoke( >> StandardEngineValve.java:109) >> at >> org.apache.catalina.core.StandardValveContext.invokeNext( >> StandardValveContext.java:104) >> at >> org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java >> :520) >> at >> org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929) >> at >> org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160) >> at >> org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799) >> at >> >> org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection >> (Http11Protocol.java:705) >> at >> org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577) >> at >> org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run( >> ThreadPool.java:683) >> at java.lang.Thread.run(Thread.java:595) >> >> I was wondering if I was on the right path or just way off. Either way, >> can >> anybody see what I am doing wrong here? I would really appreciate any >> feedback anybody could give me. >> >> Thank you for your time and energy. >> Dustin >> -- >> View this message in context: >> http://www.nabble.com/Tomcat-Persistent-Session-Issues-tf3330946.html#a9262012 >> 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] >> >> > > -- View this message in context: http://www.nabble.com/Tomcat-Persistent-Session-Issues-tf3330946.html#a9560553 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]
