I changed to: | <persistence:managed-hibernate-session name="genie_db" auto-create="true" session-factory-jndi-name="java:/genie_db"/> and still got the same error. Where in jboss do I define the TransactionManager? is com.arjuna.ats.jbossatx.jta.TransactionManagerDelegate the correct transaction manager for hibernate and postgres? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4123908#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...