First of all for any NullPointerException which doesn't give any message a Jira can be opened. Preferably with some test code attached that reproduces the problem. This NPE is caused by improper specification of the properties in persistence.xml. You must use the forum code tag if you want to show us the persistence.xml. Please do so. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4177979#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...