Problem solved by patching file IORFactory (in jboss-ejb3.jar) Method createProxy make return CORBA.Object, don't narrow to EJBObject View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4034881#4034881 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4034881