merge doesn't update the Id for transient object

vernid · **Joined:** Tue Mar 21, 2006 1:29 pm **Posts:** 9

Hi,

I made a small test using merge and I noticed that after the merge of a transient object the Id of this one is not updated with the generated id.

The insert in the db is successfull.

Here is my test:

Code:

   public void testPersistEJB() {
      EntityManagerFactory emf = (EntityManagerFactory) context.getBean("entityManagerFactory");
      EntityManager em = emf.createEntityManager();
      EntityTransaction tx=em.getTransaction();
      tx.begin();
      Contact contact = new Contact();
      contact.setName("Dupondt");
      em.merge(contact);
      tx.commit();
      em.close();
      emf.close();
      assertNotNull(contact.getId());
   }

My Contact class extends a PersistentObject which contains the id definition:

Code:

   @Id @GeneratedValue(generator="system-uuid")
   @GenericGenerator(name="system-uuid", strategy = "uuid")
   private String id;

A workaround could be to check my self if I have to do a merge or persist, but regarding wiht chap 3.7 of the Hibernate EntityManager, the merge should be deal with it and react as a persist. Isn't it?

Now, I wonder, if I missunderstoud the merge functionality or the merge has really a problem?

Regards
Dominique

emmanuel · **Posted:** Thu Sep 28, 2006 10:02 am

didn't yuou forget @GeneratedValue?

vernid · **Joined:** Tue Mar 21, 2006 1:29 pm **Posts:** 9

Emmanuel,

I don't understand you comment, because If you look at the above code, you will see that the @GeneratedValue is present.

Dominique

keenan · **Joined:** Mon Jan 09, 2006 3:05 pm **Posts:** 24

The problem is

Code:

em.merge(contact);

It should read:

Code:

contact = em.merge(contact);

--keenan

emmanuel · **Posted:** Thu Sep 28, 2006 12:27 pm

vernid wrote:

Emmanuel,

I don't understand you comment, because If you look at the above code, you will see that the @GeneratedValue is present.

Dominique

I didn't see it.
keenan is right