Try to remove the discrimator columns in your entity bean. You will only need this on your base class bean: @Entity | @Inheritance(strategy=InheritanceType.SINGLE_TABLE) In your subclasses, you need this: @Entity | @DiscriminatorValue(value="blahblah") If this simple approach is running, you should try to add a property for the column once again. Wolfgang View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4120943#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...