This turns out to be a class loading issue. Due to the complex nature of the architecture I am attempting to build. When the "new" versions of the entities are hot deployed the persistence engine apparently gets confused, and refuses to cooperate. If this sounds like a problem you are having as well, please contact me, and I can explain the issue farther, and how I got around it. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3988654#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...