Hi I'm currently migrating a working JBoss 4.0.5.GA EAR to 5.0.0.GA. The ear is structured as this: | EAR | |- Servlet WAR | |- Utility JAR | |- MDB (jms) | |- EJB_3 (stateless/no entities, no persistence) | |- EJB_1 (stateless/entities) | |-1PU | |- EJB_2 (stateless/entities) | |-2PU | Each of the EJB3 with entities have their own persistence.xml The EJB_3 with no entities, uses the EJB_1 and EJB_2 by Local interfaces. When I deploy on JBoss 5, a "failed to resolve persistence unit 1PU" error is thrown. No for 2PU, only for 1PU. So, I copy the 1PU persistence.xml file into the troublesome bean EJB_3 and deployments goes fine. But now, I get "Cannot open connection" errors. Each of this beans are independent of each other. The workflow is something like | x-->servlet-->jms_queue-->MDB-->EJB_3-->EJB_1 | Any help? Thanks View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4197075#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...