It is difficuty to diagnose a problem without seeing the complete error message along with it's stack trace. The stack trace usually holds clues as to what was going on when the error was issued. My guess is that the Oracle JDBC driver you are using on the production system does not work with Oracle 11g, in which case you should get the proper driver. Also, where did you tell Hibernate that you are using Oracle 11? Post that config file. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4205288#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...