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ClassCastException

 
Panagiotis Varlagas
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Posts: 233
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I have developed a simple J2EE project, which contains a Web project
and an EJB project. The goal here is merely to invoke a method of one
of the session beans of the EJB project. This invocation is to be
performed by a scheduler (I use an open-source library named
Pulsar - http://sourceforge.net/projects/j2eescheduler/). The Web
project is dummy and is there merely for configuration purposes
of the scheduler. The method is supposed to get invoked upon
server start-up.

I have been available to run the application just fine from within
WSAD. In particular, the server starts just fine, and the method
begins executing at that time. However, the situation is problematic
when I deploy the application to an actual WAS instance. In particular
I get a ClassCastException, as shown in the stack traces below.

Any help as to how to further investigate this problem would be
greatly appreciated... Thanks in advance!

Panagiotis Varlagas

===========================================================================

[21/2/2005 16:31:17:657 EET] 5e8bcd4b ExceptionUtil E CNTR0019E:
Non-application exception occurred while processing method "create".
Exception data: com.ibm.ejs.container.CreateFailureException: ; nested exception is:
java.lang.ClassCastException: com.webage.scheduler.EJSRemoteStatelessCubeIqFilePoller_0c4f2a53
at com.webage.scheduler.EJSStatelessCubeIqFilePollerHomeBean_0c4f2a53.create(EJSStatelessCubeIqFilePollerHomeBean_0c4f2a53.java:32)
at com.webage.scheduler.EJSRemoteStatelessCubeIqFilePollerHome_0c4f2a53.create(EJSRemoteStatelessCubeIqFilePollerHome_0c4f2a53.java:35)
at com.webage.scheduler._EJBTaskHome_Stub.create(_EJBTaskHome_Stub.java:230)
at com.webage.scheduler.Engine.addTask(Engine.java:124)
at com.webage.scheduler.Engine.startElement(Engine.java:97)
at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown Source)
at org.apache.xerces.parsers.AbstractXMLDocumentParser.emptyElement(Unknown Source)
at org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.DTDConfiguration.parse(Unknown Source)
at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
at com.webage.scheduler.Engine.reloadConfig(Engine.java:41)
at com.webage.scheduler.Engine.<init>(Engine.java:26)
at com.webage.scheduler.SchedulerServlet.init(SchedulerServlet.java:15)
at com.ibm.ws.webcontainer.servlet.StrictServletInstance.doInit(StrictServletInstance.java:82)
at com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet._init(StrictLifecycleServlet.java:147)
at com.ibm.ws.webcontainer.servlet.PreInitializedServletState.init(StrictLifecycleServlet.java:270)
at com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet.init(StrictLifecycleServlet.java:113)
at com.ibm.ws.webcontainer.servlet.ServletInstance.init(ServletInstance.java:189)
at javax.servlet.GenericServlet.init(GenericServlet.java:258)
at com.ibm.ws.webcontainer.webapp.WebAppServletManager.addServlet(WebAppServletManager.java:870)
at com.ibm.ws.webcontainer.webapp.WebAppServletManager.loadServlet(WebAppServletManager.java:224)
at com.ibm.ws.webcontainer.webapp.WebAppServletManager.loadAutoLoadServlets(WebAppServletManager.java:542)
at com.ibm.ws.webcontainer.webapp.WebApp.loadServletManager(WebApp.java:1277)
at com.ibm.ws.webcontainer.webapp.WebApp.init(WebApp.java:283)
at com.ibm.ws.webcontainer.srt.WebGroup.loadWebApp(WebGroup.java:387)
at com.ibm.ws.webcontainer.srt.WebGroup.init(WebGroup.java:209)
at com.ibm.ws.webcontainer.WebContainer.addWebApplication(WebContainer.java:987)
at com.ibm.ws.runtime.component.WebContainerImpl.install(WebContainerImpl.java:136)
at com.ibm.ws.runtime.component.WebContainerImpl.start(WebContainerImpl.java:356)
at com.ibm.ws.runtime.component.ApplicationMgrImpl.start(ApplicationMgrImpl.java:418)
at com.ibm.ws.runtime.component.DeployedApplicationImpl.fireDeployedObjectStart(DeployedApplicationImpl.java:787)
at com.ibm.ws.runtime.component.DeployedModuleImpl.start(DeployedModuleImpl.java:354)
at com.ibm.ws.runtime.component.DeployedApplicationImpl.start(DeployedApplicationImpl.java:575)
at com.ibm.ws.runtime.component.ApplicationMgrImpl.startApplication(ApplicationMgrImpl.java:271)
at com.ibm.ws.runtime.component.ApplicationMgrImpl.startApplication(ApplicationMgrImpl.java:488)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java(Compiled Code))
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java(Compiled Code))
at java.lang.reflect.Method.invoke(Method.java(Compiled Code))
at com.tivoli.jmx.modelmbean.MMBInvoker.invoke(MMBInvoker.java:46)
at com.tivoli.jmx.modelmbean.MMBInvoker.invokeOperation(MMBInvoker.java:115)
at com.tivoli.jmx.modelmbean.DynamicModelMBeanSupport.invoke(DynamicModelMBeanSupport.java:409)
at javax.management.modelmbean.RequiredModelMBean.invoke(RequiredModelMBean.java:323)
at com.tivoli.jmx.GenericMBeanSupport.invoke(GenericMBeanSupport.java:178)
at com.tivoli.jmx.MBeanAccess.invoke(MBeanAccess.java:113)
at com.tivoli.jmx.MBeanServerImpl.invoke(MBeanServerImpl.java:290)
at com.ibm.ws.management.AdminServiceImpl.invoke(AdminServiceImpl.java:659)
at com.ibm.ws.console.core.mbean.MBeanHelper.invoke(MBeanHelper.java:141)
at com.ibm.ws.console.appdeployment.ApplicationDeploymentCollectionAction.perform(ApplicationDeploymentCollectionAction.java:315)
at org.apache.struts.action.ActionServlet.processActionPerform(ActionServlet.java:1791)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1586)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:510)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
at javax.servlet.http.HttpServlet.service(HttpServlet.java(Compiled Code))
at com.ibm.ws.webcontainer.servlet.StrictServletInstance.doService(StrictServletInstance.java(Compiled Code))
at com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet._service(StrictLifecycleServlet.java(Compiled Code))
at com.ibm.ws.webcontainer.servlet.IdleServletState.service(StrictLifecycleServlet.java:313)
at com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet.service(StrictLifecycleServlet.java(Inlined Compiled Code))
at com.ibm.ws.webcontainer.servlet.ServletInstance.service(ServletInstance.java(Compiled Code))
at com.ibm.ws.webcontainer.servlet.ValidServletReferenceState.dispatch(ValidServletReferenceState.java(Compiled Code))
at com.ibm.ws.webcontainer.servlet.ServletInstanceReference.dispatch(ServletInstanceReference.java(Inlined Compiled Code))
at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.handleWebAppDispatch(WebAppRequestDispatcher.java(Compiled Code))
at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.dispatch(WebAppRequestDispatcher.java(Compiled Code))
at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.forward(WebAppRequestDispatcher.java:200)
at com.ibm.ws.webcontainer.srt.WebAppInvoker.doForward(WebAppInvoker.java:119)
at com.ibm.ws.webcontainer.srt.WebAppInvoker.handleInvocationHook(WebAppInvoker.java:276)
at com.ibm.ws.webcontainer.cache.invocation.CachedInvocation.handleInvocation(CachedInvocation.java:71)
at com.ibm.ws.webcontainer.cache.invocation.CacheableInvocationContext.invoke(CacheableInvocationContext.java:114)
at com.ibm.ws.webcontainer.srp.ServletRequestProcessor.dispatchByURI(ServletRequestProcessor.java:186)
at com.ibm.ws.webcontainer.oselistener.OSEListenerDispatcher.service(OSEListener.java:334)
at com.ibm.ws.webcontainer.http.HttpConnection.handleRequest(HttpConnection.java:56)
at com.ibm.ws.http.HttpConnection.readAndHandleRequest(HttpConnection.java:618)
at com.ibm.ws.http.HttpConnection.run(HttpConnection.java:443)
at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java(Compiled Code))
Caused by: java.lang.ClassCastException: com.webage.scheduler.EJSRemoteStatelessCubeIqFilePoller_0c4f2a53
at com.webage.scheduler.EJSStatelessCubeIqFilePollerHomeBean_0c4f2a53.create(EJSStatelessCubeIqFilePollerHomeBean_0c4f2a53.java:22)
... 77 more
 
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