I experienced the same issue in 4.0.4 release. Discriminator does not show up in the generated SQL statement. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3970154#3970154 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3970154