"niclas.lindberg" wrote : The Entity EJB3 classes are in the shared-subsystems.jar and the persistence.xml is the accountsystem.jar's meta-inf directory. Yep - the error isn't due to classloading; it's to the container not recognizing your classes as entities. Throw persistence.xml into META-INF of shared-subsystems.jar, where your entities are, and give that a whirl. S, ALR View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3979418#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...