Working with EAR file & (Servlet/JSP) Clustering - Please Help

Question

          Hi,
          In my project we pack our application using EAR file. We read BEA's article, which
          discussed the class loaders hierarchy and it looks like this problem should not occur:
          When the garbage collection is being invoked - it somehow fails to resolve the class
          weblogic.jndi.WLInitialContextFactory.
          We have encountered the following error (stack trace):
          Message: severity="ERROR" sessionId="9IUUN4xoQf1wOkfEN8m62SFjEpNC1e4lLHSzyc2s01GPk5Up25cJ!-1680906364!182460375!7559!7002!1728341859!182464192!7559!7002!1023972500766"
          date="Jun 13, 2002" time="3:49:05 PM" threadId="Finalizer"
          Description:
          Throw:     amdocs.jspInfra.exceptions.FailedToRemoveEjbException: [an error occurred
          while trying to remove an ejb.]
          null- caused by: amdocs.jspInfra.exceptions.InitialContextCreationFailureException:
          [an error occurred while trying to create a new initial context.]
          null- caused by: javax.naming.NoInitialContextException: Cannot instantiate class:
          weblogic.jndi.WLInitialContextFactory [Root exception is java.lang.ClassNotFoundException:
          weblogic/jndi/WLInitialContextFactory]
          amdocs.jspInfra.exceptions.InitialContextCreationFailureException: [an error occurred
          while trying to create a new initial context.]
          null- caused by: javax.naming.NoInitialContextException: Cannot instantiate class:
          weblogic.jndi.WLInitialContextFactory [Root exception is java.lang.ClassNotFoundException:
          weblogic/jndi/WLInitialContextFactory]
          javax.naming.NoInitialContextException: Cannot instantiate class: weblogic.jndi.WLInitialContextFactory.
          Root exception is java.lang.ClassNotFoundException: weblogic/jndi/WLInitialContextFactory
               at java.lang.Class.forName0(Native Method)
               at java.lang.Class.forName(Class.java:195)
               at com.sun.naming.internal.VersionHelper12.loadClass(VersionHelper12.java:45)
               at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:652)
               at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:246)
               at javax.naming.InitialContext.init(InitialContext.java:222)
               at javax.naming.InitialContext.<init>(InitialContext.java:198)
               at amdocs.jspInfra.userManagement.RequestContext._createContext(RequestContext.java:550)
               at amdocs.jspInfra.userManagement.RequestContext.createContext(RequestContext.java:391)
               at amdocs.jspInfra.userManagement.RequestContext.createContext(RequestContext.java:415)
               at amdocs.jspInfra.beans.GenericJspBean._removeConversation(GenericJspBean.java:466)
               at amdocs.jspInfra.beans.GenericJspBean._cleanUp_(GenericJspBean.java:413)
               at amdocs.jspInfra.beans.GenericJspBean.cleanUp_(GenericJspBean.java:117)
               at amdocs.jspInfra.beans.GenericJspBean.finalize(GenericJspBean.java:593)
               at java.lang.ref.Finalizer.invokeFinalizeMethod(Native Method)
               at java.lang.ref.Finalizer.runFinalizer(Finalizer.java:86)
               at java.lang.ref.Finalizer.access$100(Finalizer.java:17)
               at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:163)
          

Answer 1

The context classloader needs to be set so that the thread can load the
          Weblogic context factory class inside the finalizer thread.
          Simply save the context classloader when running inside the ejb code and set
          that inside finalize method so that the class can get loaded correctly.
          1) keep a member variable
          ClassLoader myccl;
          2) Instantiate it in the regular application thread as
          myccl = Thread.currentThread().getContextClassLoader();
          3) In the finalize() method keep this as the first line.
          Thread.currentThread().setContextClassLoader(myccl);
          -Sabha
          "Yossi Cohen" <[email protected]> wrote in message
          news:[email protected]...
          >
          > Hi,
          >
          > In my project we pack our application using EAR file. We read BEA's
          article, which
          > discussed the class loaders hierarchy and it looks like this problem
          should not occur:
          > When the garbage collection is being invoked - it somehow fails to resolve
          the class
          > weblogic.jndi.WLInitialContextFactory.
          > We have encountered the following error (stack trace):
          >
          > Message: severity="ERROR"
          sessionId="9IUUN4xoQf1wOkfEN8m62SFjEpNC1e4lLHSzyc2s01GPk5Up25cJ!-1680906364!
          182460375!7559!7002!1728341859!182464192!7559!7002!1023972500766"
          > date="Jun 13, 2002" time="3:49:05 PM" threadId="Finalizer"
          > Description:
          > Throw: amdocs.jspInfra.exceptions.FailedToRemoveEjbException: [an error
          occurred
          > while trying to remove an ejb.]
          > null- caused by:
          amdocs.jspInfra.exceptions.InitialContextCreationFailureException:
          > [an error occurred while trying to create a new initial context.]
          > null- caused by: javax.naming.NoInitialContextException: Cannot
          instantiate class:
          > weblogic.jndi.WLInitialContextFactory [Root exception is
          java.lang.ClassNotFoundException:
          > weblogic/jndi/WLInitialContextFactory]
          > amdocs.jspInfra.exceptions.InitialContextCreationFailureException: [an
          error occurred
          > while trying to create a new initial context.]
          > null- caused by: javax.naming.NoInitialContextException: Cannot
          instantiate class:
          > weblogic.jndi.WLInitialContextFactory [Root exception is
          java.lang.ClassNotFoundException:
          > weblogic/jndi/WLInitialContextFactory]
          > javax.naming.NoInitialContextException: Cannot instantiate class:
          weblogic.jndi.WLInitialContextFactory.
          > Root exception is java.lang.ClassNotFoundException:
          weblogic/jndi/WLInitialContextFactory
          > at java.lang.Class.forName0(Native Method)
          > at java.lang.Class.forName(Class.java:195)
          > at
          com.sun.naming.internal.VersionHelper12.loadClass(VersionHelper12.java:45)
          > at
          javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:652)
          > at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:246)
          > at javax.naming.InitialContext.init(InitialContext.java:222)
          > at javax.naming.InitialContext.<init>(InitialContext.java:198)
          > at
          amdocs.jspInfra.userManagement.RequestContext._createContext(RequestContext.
          java:550)
          > at
          amdocs.jspInfra.userManagement.RequestContext.createContext(RequestContext.j
          ava:391)
          > at
          amdocs.jspInfra.userManagement.RequestContext.createContext(RequestContext.j
          ava:415)
          > at
          amdocs.jspInfra.beans.GenericJspBean._removeConversation(GenericJspBean.java
          :466)
          > at amdocs.jspInfra.beans.GenericJspBean._cleanUp_(GenericJspBean.java:413)
          > at amdocs.jspInfra.beans.GenericJspBean.cleanUp_(GenericJspBean.java:117)
          > at amdocs.jspInfra.beans.GenericJspBean.finalize(GenericJspBean.java:593)
          > at java.lang.ref.Finalizer.invokeFinalizeMethod(Native Method)
          > at java.lang.ref.Finalizer.runFinalizer(Finalizer.java:86)
          > at java.lang.ref.Finalizer.access$100(Finalizer.java:17)
          > at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:163)
          >