Have you packaged the AddressFacade bean's interfaces in more than one archive? Maybe in the fooejb.jar and fooweb.war? If so, then remove those interfaces from the war and maintain them in only one place, the fooejb.jar. For more details, have a look at: http://wiki.jboss.org/wiki/Wiki.jsp?page=ClassCastExceptions Specifically, the jmx-console method mentioned over there. See if that helps. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4029175#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...