java.lang.ClassCastException: mypackage.DynWLGroup

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java.lang.ClassCastException: mypackage.DynWLGroup
at weblogic.security.acl.AclImpl.checkPermission(AclImpl.java:356)
at weblogic.security.acl.Security.hasPermission(Security.java:101)
at weblogic.servlet.internal.ServletContextImpl.checkA(ServletContextImpl.java:1963)
at weblogic.servlet.internal.ServletContextImpl.checkAccess(ServletContextImpl.java:1796)
at weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletContextImpl.java:938)
at weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletContextImpl.java:905)
at weblogic.socket.MuxableSocketHTTP.invokeServlet(MuxableSocketHTTP.java:391)
at weblogic.socket.MuxableSocketHTTP.execute(MuxableSocketHTTP.java:273)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:129)

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