Oh, and one other thing. The entity manager will only flush changes that you made to attached POJO entities. You can't just do "new MyEntity()" and expect the entity manager to do anything with it. You must do either em.persist() to attach it as a new entity, an em.find() to load an existing entity into the entity manager session or something similar to load an existing entity into session (like execute a query). em.merge() will, by definition, act as a em.persist() if the object you are merging isn't attached and is a new entity that does not yet exist in the DB. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4116594#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...