In your application-context.xml file, how are you referencing the DataSource? Something is causing the DataSource to be treated a remotely enabled DataSource which is typically only possible by setting the <use-java-context> element in your *-ds.xml file to false. I am assuming that you have not modified the JBoss/Tomcat configuration and you are simply deploying your application as a normal J2EE web application (WAR file). View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3983116#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...