The standardjbosscmp-jdbc.xml file is used for EJB 2.x, does your app use EJB 2.x or 3?. mysq-persistence-service.xml - is this a typo? The existing file is hsqldb-persistence-service.xml. Are you trying to replace hsqldb with mysql for messaging? Are you using messaging in your app? Search the server.log file for the first reference to smsactjndi - the data source must have been defined earlier. If none of this helps, do this: 1) Install JBoss AS again (into a different location would be fine). Run it without making any changes. 2) If it runs OK, deploy the *-ds.xml file. 3) If that goes OK, stop JBoss AS, change the standardjbosscmp-jdbc.xml file and start JBoss AS again. 4) If that goes OK, deploy your app. If something goes wrong, state which step above had the problem and post the exception stack trace. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4217602#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...