Don't use Tomcat's flakey datasource. The one in JBoss MC is much more robust. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4050313#4050313 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4050313