Thanks, it helped me a lot! Now, I kinda understood how it's working, but my very last problem is pretty tough: I can't retrieve the EntityManager in my Session Bean extending ResourceBundle. @Stateless | @Scope(SESSION) | @Name("dbResourceBundle") | public class DBResourceBundle extends ResourceBundle implements iDBResourceBundle{ | | @PersistenceContext | private EntityManager em; | | private List<CustomResourceBundle> availableResourceBundles; | | public DBResourceBundle(){ | System.out.println("EntityManager: "+em); //em is null :/ | try{ | availableResourceBundles = em.createQuery("select rb from CustomResourceBundle rb").getResultList(); | } | catch(Exception e){ | //null pointer exception cause em is null. | e.printStackTrace(); | | } | } | ... | CustomResourceBundle being an entity bean representing a 'bundle' for the given language. How to retrieve a workable EntityManager? My guess is that when this Session Bean is instanciated, the PersistenceContext isn't created yet. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4059868#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...