The issue is that once you place a resource-ref into web.xml, then the app expects to find the resource in the local naming context (java:/comp/env/portalDS). But you need to tell JBoss AS to map the name back to the java: namespace. To do that, place an entry for the datasource in WEB-INF/jboss-web.xml: <jboss-web> | <resource-ref> | <res-ref-name>portalDS</res-ref-name> | <jndi-name>java:portalDS</jndi-name> | </resource-ref> | </jboss-web> Also, please use 'code' tags around your XML text - select the text and click the Code button above the editor window. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4243838#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...