Hibernate Community • View topic - Parent Child question

View unanswered posts | View active topics

Board index » Hibernate & Java Persistence » Hibernate Users

All times are UTC - 5 hours [ DST ]

Parent Child question

Page 1 of 1

[ 6 posts ]

Previous topic | Next topic

Author

Message

Lino Cibran

Post subject: Parent Child question

Posted: Wed Mar 31, 2010 9:42 am

Beginner

Joined: Fri Jul 20, 2007 10:38 am
Posts: 49

Hello,

I have a parent-child of the same class. When I declare a persisted object to have a parent, I get a org.hibernate.NonUniqueObjectException: a different object with the same identifier value was already associated with the session: [class + objects' primary key here]. I don't have this issue when running this change as a unit-test.

If I create the child to have a parent and INSERT it, it is persisted.
So basically, changing a parent to a child doesn't work (it's still the same object-class).

The relation is declared as a <many-to-one name="parent".. /> -relation.
I've set insert and update to false, my cascade is set to none.
I've changed several attributes, but get the same results.

What am I missing?

Thanks!

Top

pb00067

Post subject: Re: Parent Child question

Posted: Wed Mar 31, 2010 9:55 am

Expert

Joined: Tue Jun 16, 2009 3:36 am
Posts: 990

How do you define the @Id property in your entity class?
Do you use a generated value or do you set the id manually?

Top

Lino Cibran

Post subject: Re: Parent Child question

Posted: Wed Mar 31, 2010 10:03 am

Beginner

Joined: Fri Jul 20, 2007 10:38 am
Posts: 49

The ID is generated. What basically happens on the save is this:

[code]if (parentIsSet()) {
Parent parent = dao.getParent(parentId);
person.setParent(parent);
dao.saveOrUpdate(person);
[/code]

Top

Lino Cibran

Post subject: Re: Parent Child question

Posted: Thu Apr 01, 2010 12:35 pm

Beginner

Joined: Fri Jul 20, 2007 10:38 am
Posts: 49

I've turned on the Hibernate.SQL to debug, it says:

Code:

def.AbstractSaveEventListener  - detached instance of: <class here>
def.DefaultSaveOrUpdateEventListener  - updating detached instance
def.DefaultSaveOrUpdateEventListener  - updating [<class here>#<id here>]

What I see is that that is correct, it should do an update, still it throws a:

Code:

org.hibernate.NonUniqueObjectException: a different object with the same identifier value was already associated with the session: <class here>#<id here>]
   at org.hibernate.engine.StatefulPersistenceContext.checkUniqueness(StatefulPersistenceContext.java:590)
   at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.performUpdate(DefaultSaveOrUpdateEventListener.java:284)
   at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsDetached(DefaultSaveOrUpdateEventListener.java:223)
   at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:89)
   at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:70)

I'm really stunned here. I have removed the cascade attribute from the hbm-file and also set it to none. None works. What to do?

Top

pb00067

Post subject: Re: Parent Child question

Posted: Fri Apr 02, 2010 4:35 am

Expert

Joined: Tue Jun 16, 2009 3:36 am
Posts: 990

Why do you detach and re-attach instances in your unit of work ?

Top

Lino Cibran

Post subject: Re: Parent Child question

Posted: Tue Apr 06, 2010 3:43 am

Beginner

Joined: Fri Jul 20, 2007 10:38 am
Posts: 49

I'm using Spring (1.2.8) and a web frontend, I guess the OpenSessionInViewFilter does this for me.
My transactions are configured on the dao's method saveOrUpdate (PROPAGATION_REQUIRED).

Top

Page 1 of 1

[ 6 posts ]

Board index » Hibernate & Java Persistence » Hibernate Users

All times are UTC - 5 hours [ DST ]

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum