"foreign" GeneratorType and one-to-one by PK

Jana · **Joined:** Wed Oct 26, 2005 3:37 am **Posts:** 15

In http://hibernate.org/~emmanuel/doc/#gen21 I found the following:

Quote:

Unfortunatly, in the current release of Hibernate Annotations, the Heart identifier value has to be set manually by the application developer. Support for a Hibernate-style "foreign" identifier generator will be added soon.

I wonder what is the status of this and how it relates to ejb3?

([url]http://www.jboss.com/index.html?module=bb&op=viewtopic&t=72070
[/url])

Thanks![/quote]

emmanuel · **Posted:** Wed Nov 09, 2005 3:00 pm

This doc is very obsolete, use the one in the web site please.
This shold work but not in a standard EJB3 way

robmoore · **Joined:** Fri Apr 01, 2005 2:09 pm **Posts:** 1

I am not having success with this. Looking at the unit test for the Body/Heart one-to-one relationship it doesn't appear as if this functionality is actually tested (note how the ID is manually set in Heart):

Code:

   public void testUnidirectionalTrueOneToOne() throws Exception {
      Body b = new Body();
      Heart h = new Heart();
      b.setHeart(h);
      b.setId( new Integer(1) );
      h.setId( b.getId() ); //same PK
      Session s;
      Transaction tx;
      s = openSession();
      tx = s.beginTransaction();
      s.persist(h);
      s.persist(b);
      tx.commit();
      s.close();

      s = openSession();
      tx = s.beginTransaction();
      b = (Body) s.get( Body.class, b.getId() );
      assertNotNull(b);
      assertNotNull( b.getHeart() );
      assertEquals( h.getId(), b.getHeart().getId() );
      tx.commit();
      s.close();

   }

I have two classes defined in much the same way as the Body/Heart example (except I have @OneToOne(cascade = CascadeType.ALL, fetch = FetchType.LAZY)) and I get the following error:

Code:

org.hibernate.id.IdentifierGenerationException: ids for this class must be manually assigned before calling save()

maulinshah · **Joined:** Thu Sep 09, 2004 6:50 am **Posts:** 15

you need to use the custom forign generic generator:

@Id @GeneratedValue(generator="foreign")
@GenericGenerator(name="foreign", strategy = "foreign", parameters = {@Parameter(name="property", value="propName")})

emmanuel · **Posted:** Sun Feb 12, 2006 10:21 am

can somebody sommarize that on the annotations FAQ?