This actually might be a problem, I had to jump through a bunch of hoops to get this working. Let me get together a test case and I will post it on the forum for the Design team to look at. I have a small application that integrates with hibernate and also with your custom hbm files, exactly the way you need, was part of a blog post I was planning on writing. You can refer to that, I will be posting that over the weekend. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4244457#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...