I still have no clue why your packaging should result in that error. Why not try this package structure: - q.ear/lib/utils.jar | - q.ear/META-INF/application.xml (module/ejb=beans.jar) | - q.ear/beans.jar | - q.ear/beans.jar/META-INF/persistence.xml And dont specify the jar-file element in the persistence.xml. See if this works. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4106797#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...