I've changed the way EJB 3 submits the persistence root url to Hibernate. See http://viewvc.jboss.org/cgi-bin/viewvc.cgi/jbossas?view=rev&revision=.... It works (and should also work for Toplink), but I don't like it. I would rather see the spec bend to accept any jar url. So jar:mywar.war!/WEB-INF/classes/ becomes a valid input. (I think this works for Toplink, it does not work for Hibernate.) View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4109747#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...