I have more of a definitive question than a problem. When does Thread.setCurrentClassLoader() get called for messages being processed in an MDB? It seems this is somehow reset. JBoss AS /connector does not do this. Looking at the Hibernate sources, Hibernate does not make this call. So I assume it's part of JBoss Messaging (the JmsSession), and it must get reset before transaction commit. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4068315#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...