[Hibernate-issues] [Hibernate-JIRA] Created: (HHH-1923) Merge for an entity with a non-cascading one-to-many collection fails if the collection contains transient objects

[Manfred G. (JIRA) <no...@at...>]

Merge for an entity with a non-cascading one-to-many collection fails if the collection contains transient objects
------------------------------------------------------------------------------------------------------------------

         Key: HHH-1923
         URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-1923
     Project: Hibernate3
        Type: Bug

  Components: core  
    Versions: 3.1.3, 3.2.0.cr3    
    Reporter: Manfred Geiler


With the EventManager example this bug is easy to reproduce.
The following fails with a TransientObjectException:

        Session session = HibernateUtil.getSessionFactory().getCurrentSession();
        session.beginTransaction();

        Event theEvent = new Event();
        theEvent.setTitle("a title");
        theEvent.setDate(new Date());

        Person thePerson = new Person();
        thePerson.setFirstname("foo");
        thePerson.setLastname("bar");

        theEvent.getParticipants().add(thePerson);
        thePerson.addToEvent(theEvent);

        session.merge(theEvent);

        session.getTransaction().commit();

This is, because Hibernate tries to copy ALL values from the transient "event" object including ALL collection properties as well. Now, the "participants" Set contains a transient "person" which makes the CollectionType.replaceElements method fail.

The same applies when theEvent is a detached instead of a transient object:

        Session session = HibernateUtil.getSessionFactory().openSession();
        session.beginTransaction();
        Event theEvent = new Event();
        theEvent.setTitle("a title");
        theEvent.setDate(new Date());
        session.save(theEvent);
        session.getTransaction().commit();
        session.close();

        session = HibernateUtil.getSessionFactory().openSession();
        session.beginTransaction();

        Person thePerson = new Person();
        thePerson.setFirstname("foo");
        thePerson.setLastname("bar");

        theEvent.getParticipants().add(thePerson);
        thePerson.addToEvent(theEvent);

        session.merge(theEvent);

        session.getTransaction().commit();
        session.close();

Suggested Solution:
Hibernate should not try to copy collections during merge if the collection is defined without cascade.

Thoughts?


-- 
This message is automatically generated by JIRA.
-
If you think it was sent incorrectly contact one of the administrators:
   http://opensource.atlassian.com/projects/hibernate/secure/Administrators.jspa
-
For more information on JIRA, see:
   http://www.atlassian.com/software/jira