Try creating a interface for your Cabin object to implement. public interface ICabin { public int getId(); public void setId(int id); public String getName(); public void setName(); } Then have your travel agent return the ICabin rather than the Cabin. I had a similar problem that the xml mappings. I dont know if its a bug or not but i found that it 4.0.4ga would not generate the mappings for any class that had a super class. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3964526#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...