It is a hibernate issue. The reveng.xml is from Hibernate Tools, and it isn't used to store mappings either. The answer is that hibernate-tools isn't perfect, and sometimes makes mistakes (like this) which you have to correct by hand. If you come across such a problem you need to (1) fix it in your app, (2) report it in the hibernate tools forum so they can add it to the mapping files which come with hibernate tools. You can also ask about reveng.xml on the hibernate tools forum. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4114578#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...