Hello, The change from JTA to RESOURCE_LOCAL. in the persistence.xml is because we wanted to use JPA transactions for the example - previously it was using JTA. Take a look at Chapter 8 of reference guide for some more info on the config. Do you have "<transaction:entity-transaction entity-manager="#{em}"/>" in your components.xml file? This is what will work together with JPA setting. Also so you have any openJPA properties set? It seems to be complaining about one that is set. -Jay View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4128116#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...