The only way I can see that the StubClass would become a jacorb reference is if something is invoking the constructor HandleImplIIOP(org.omg.CORBA.Object obj) with the reference without doing some narrow() code like the handle does. Add some debug code to the constructor to see what is passing a corba Object that does not implement EJBObject. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4091633#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...