My guess would be that you are packaging Client.class in both ears and you should have it only in ejb3 package. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3961080#3961080 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3961080