It seems that the entityManager.getDelegate() returns either a SessionImpl or a EntityManagerImpl, depending on wether or not you have the following set up in your components.xml: <core:managed-persistence-context name="bookingDatabase" | auto-create="true" | persistence-unit-jndi-name="java:/EntityManagerFactories/bookingData"/> and persistence.xml: <property name="jboss.entity.manager.factory.jndi.name" | value="java:/EntityManagerFactories/bookingData"/> That is - if this is set up, SessionImpl is returned. Otherwise EntitiyManagerImpl is returned. I can't really find a logical explanation for this, but it's not a problem as long as I know about it. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4023362#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...