Java.lang.ClassCastException in WebLogic 10.3.3 after recompile

Question

While editing some code a developer noticed this error after a recompile in Weblogic 10.3.3. And the underlying object is a DimensionLabel. And we tried this in Weblogic 9.2 and it works fine with no exception. The developer simply recompiled the class calling the DimensionLabel the SearchServiceProcessor and reran the application.
net.nrj.service.SearchServiceProcessor java.lang.ClassCastException: net.nrj.alf.DimensionLabel java.lang.ClassCastException: net.nrj.alf.DimensionLabel at net.nrj.service.SearchServiceProcessor.setRefinements(SearchServiceProcessor.java:911) at net.nrj.service.SearchServiceProcessor.process(SearchServiceProcessor.java:134) at net.nrj.service.ServiceController.processRequest(ServiceController.java:323) at net.nrj.service.ServiceController.doGet(ServiceController.java:307) at javax.servlet.http.HttpServlet.service(HttpServlet.java:707) at javax.servlet.http.HttpServlet.service(HttpServlet.java:821) at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227) at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125) at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:300) at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:184) at weblogic.servlet.internal.RequestDispatcherImpl.invokeServlet(RequestDispatcherImpl.java:529) at weblogic.servlet.internal.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:253) at weblogic.servlet.internal.ServletResponseImpl.sendError(ServletResponseImpl.java:719) at weblogic.servlet.internal.ServletResponseImpl.sendError(ServletResponseImpl.java:591) at weblogic.servlet.FileServlet.findSource(FileServlet.java:270) at weblogic.servlet.FileServlet.doGetHeadPost(FileServlet.java:191) at weblogic.servlet.FileServlet.service(FileServlet.java:173) at javax.servlet.http.HttpServlet.service(HttpServlet.java:821) at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227) at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125) at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:300) at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:184) at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.doIt(WebAppServletContext.java:3686) at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3650) at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321) at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121) at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2268) at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2174) at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1446) at weblogic.work.ExecuteThread.execute(ExecuteThread.java:201) at weblogic.work.ExecuteThread.run(ExecuteThread.java:173)
Thanks, Tom
PS
Here is my code :
DimensionLabel dimLabel = (DimensionLabel);
dimensionLabel.get(currentDimension.getName());
currentRefinementDimension = new Refinement(); // Exception here
currentRefinementDimension.setExpanded(true);
I debugged into the code and the hashtable dimensionLabel has a DimensionLabel in it.
Edited by: thenrick on Dec 10, 2010 3:15 PM

Answer 1

Hi,
Please make sure that there is no other version of *"net.nrj.alf.DimensionLabel"* class present in any other Class Loader
There are various kind of Class Loaders : PreMordial Class Loader, BootStrap ClassLoader, System Class Loader (WebLogic ClassLoader), Application ClassLoader, Module Class Loader....
net.nrj.service.SearchServiceProcessor java.lang.ClassCastException: net.nrj.alf.DimensionLabel java.lang.ClassCastException: net.nrj.alf.DimensionLabel If your code is working fine in WLS9.2 it means in WLS10.3.3 the same class is getting loaded from different Class Loaders...In order to find out which classLoader is being used to load that class please do the following:
<b><font color=maroon>
Class dimentionLevel=Class.forName("net.nrj.alf.DimensionLabel")
ClassLoader cl=dimentionLevel.getClassLoader();
System.out.println("\n\n\t DimentionLevel is loaded from ClassLoader: "+cl);
</font></b>
Above 3 Lines of code you need to write for "net.nrj.service.SearchServiceProcessor" class as well...Because i suspect that these two classes are getting loaded from two different class Loaders.
If the Application Code is 100% correct The Main reason of ClassCastException is Classes are getting Loaded from two Different Class Loaders. You can also look at the Filtering ClassLoader Feature of WebLogic to Tell WebLogic to Load some Classes from a Specific ClassLoaders...As described Here .*http://middlewaremagic.com/weblogic/?page_id=192*
Thanks
Jay SenSharma
http://middlewaremagic.com/weblogic/?page_id=2261  (Middleware magic Is Here)