Hi, this depends on your app. If it has support different servers, you should not use Hibernate. If you know that this app will never run on other servers than JBoss, you can use EJB3 and Hibernate (hoping that JBoss will never change the persistence provider). Probably bad things will happen, if you mix Hibernate and a JPA provider of another vendor ;-). Hope this helps Wolfgang View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4262651#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...