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java.lang.ClassCastException: mypackage.DynWLGroup	at	at	at weblogic.servlet.internal.ServletContextImpl.checkA(	at weblogic.servlet.internal.ServletContextImpl.checkAccess(	at weblogic.servlet.internal.ServletContextImpl.invokeServlet(	at weblogic.servlet.internal.ServletContextImpl.invokeServlet(	at weblogic.servlet.internal.ServletContextManager.invokeServlet(	at weblogic.socket.MuxableSocketHTTP.invokeServlet(	at weblogic.socket.MuxableSocketHTTP.execute(	at