[jboss-user] [EJB 3.0] - Bug? @Inheritance(strategy=JOINED) AND @DiscriminatorValue d

[fhh]

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-inheritance.html[/url] ) 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]

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