Thank you so much Wolfgang..this I did not know :-) So does this mean I do not need to call em.getTransaction.begin(), em.getTransaction.commit() and em.getTransaction.rollback() but it still means I need to call em.persist(myEntity) or em.delete(myEntity) from inside the bean, right ? (This is linked to my later question on where is the most suitable place to instantiate the EntityManagerFactory and EntityManager.) View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4200466#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...