Just tried out with a simple application. I too see the same exception. Looks like a bug. If your persistence.xml is in the same jar as the beans, then as a workaround, change your injection code as follows: @SuppressWarnings("unused") | @PersistenceContext | private EntityManager em; Specifying a "name" attribute to the @PersistenceContext injection seems to be creating the issue. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4162789#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...