anonymous wrote : We're migrating from the JBoss 4.0.2 to 5.2.3 I assume that's a typo. You are migrating to JBoss-4.2.3 GA, right? anonymous wrote : com.arjuna.ats.internal.jta.transaction.arjunacore.lastResource.disallow] Adding multiple last resources is disallowed. Current resource is org.jboss.resource.connectionmanager.TxConnectionManager$LocalXAResource@ff665a I think you are using multiple transactional resources in a single transaction. And the datasource that you are using is not XA. See this for details http://www.jboss.org/community/docs/DOC-11443 View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4185611#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...