Thank you so much for your reply. I did not receive a email as I thought when somebody reply I will get email. I put the -ds.xml file inside the server\default\deploy dir. resource reference entry in web.xml: <resource-ref> <res-ref-name>TradeRTUDB</res-ref-name> <res-type>javax.sql.DataSource</res-type> <res-auth>Container</res-auth> </resource-ref> resource reference entry in jboss-web.xml: <resource-ref> <res-ref-name>TradeRTUDB</res-ref-name> <res-type>javax.sql.DataSource</res-type> <jndi-name>java:/TradeRTUDB</jndi-name> </resource-ref> Now, I take of the access datasource during servlet start up, it is OK for my application. But that is not ideal. Look forward to hearing from you soon. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4124539#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...