the .CLASS_ things have to do with hibernate and inheritance. Look at the hibernate mappings. anonymous wrote : "check the article in the Wiki" is not very useful. I disagree, since (at least) I only say this when there IS an article about it in the wiki or the forum. I think I do not *have* to search for you do I... there are things you can do yourself and learn from it... just the way I and others did. e.g. often when searching you see things that can come in handy later on. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4222612#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...