we changed the ENC implementation for EJB3 to be ThreadLocal based instead of keyed by classloader. We can't change the implementation for java:comp for JBoss 4, so there is a new java:comp namespace for now: "java:comp.ejb3" You can get this as a constant via org.jboss.ejb3.Container.ENC_CTX_NAME we'll change the value of this constant back to java:comp for JBoss 5. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3968266#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...