Hello! It seems that the the JBoss EJB3/Hibernate stuff ignores the @DiscriminatorValue annotation on JOIND inheritances: | @Entity | @Inheritance(strategy=JOINED) | public abstract class parent { | | @Id | Integer id; | | } | | @Entity | @DiscriminatorValue("child") | public class child extends parent { | | private String value; | | } | If I read the documentation correctly the table parent should have a column DTYPE and for every persited child object it should have the value child. I know this value is not actually necessary since I could simply inner join child and parent but this becomes inefficient if more than a couple of classes extend parent. And it is unefficient if all I'm interested in is some aggregation of values in parent. I am not sured if support for discriminator column is required by the specs but Toplink ( http://www.oracle.com/technology/products/ias/toplink/jpa/howto/use-inher... ) and Kodo [url]http://docs.solarmetric.com/full/html/ejb3_overview_mapping_discrim.html support this. To me this seems like a bug because it makes the inheritance strategy JOINED far less useful. Regards Felix[/url] View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4007994#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...