There are several things you need to check: 1) copy oracle-ds.xml from jboss/docs/examples/jca to jboss/server/xxx/deploy (edit the client connection and user/pass fields). | 2) make sure your persistence.xml file specifies Oracle as the datasource. | 3) download ojdbc14.jar and put it in jboss/server/xxx/lib (has Oracle drivers). View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4054324#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...