"all of a sudden" EJB3 CMP entity beans are failing with: "javax.ejb.EJBException: java.lang.IllegalArgumentException: Unknown entity: __" when I call em.persist(MyCMPBean) from the session bean. Don't think it matters but... the Session Bean is a Stateless EJB as a webservice. All beans are done with annotations. persistence.xml is in the jarfile contained in the ear file and referenced by application.xml as a module. The classes are not explicitly listed however the PU does define "<exclude-unlisted-classes>false</exclude-unlisted-classes>" This worked fine until recently and I don't think anything changed (of course something obviously did and I cannot find it) View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3972124#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...