In Seam 2.0 you need to change the namespace from core to persistence for the managed-persistence-context element. <persistence:managed-persistence-context name="entityManager" | auto-create="true" persistence-unit-jndi-name="java:/EntityManagerFactories/LaboraemPersistenceFactory/> and add necessary namespace declarations if necessary View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4071820#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...