You want to know what it was? I changed from using EntityManagerFactory.createEntityManager() which is deprecated to using EntityManagerFactory.buildEntityManager. That bust the whole thing! I'm sticking with the deprecated method. What's going on? They've basically broken Hibernate, by adding a new method which doesn't work, and deprecated the working method! View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4056760#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...