You can mix ejb2.1 and ejb3 in your application. But they need to be deployed via separate jars. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4043253#4043253 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4043253