Hi,

I'm facing a problem with Hibernate 3.2.1 GA tied with Spring framework. I think the problem is due to how I use Hibernate.

1- I load an object A (Class C id 1) through a Hibernate Session.
2- I store object A in memory.
3- In a transaction, I open a new Hibernate Session
4- In this Hibernate Session, I load a lof of objects including a similar object than A (Class C id 1).
5- After some operations, I want to saveOrUpdate object A referenced in step 1 : Hibernate throw an exception :

a different object with the same identifier value was already associated with the session: [com.mycompany.mypackage.MyClass#1]; nested exception is org.hibernate.NonUniqueObjectException: a different object with the same identifier value was already associated with the session: [com.mycompany.mypackage.MyClass#1]

What's wrong ? How can I solve this problem ?

Thanks a lot !

Regards,
E. Lewandowski

Which object has the latest data? If both can have modifications then you have to somehow merge these modifications otherwise evict the object first and then update it with what you know that should be in the database.



Farzad-

Thanks Farzad

Object loaded in step 4 is an read-only object. I may remove it from the hibernate session is needed. It has no modification.

I have no reference on this object : it is in the session but never user. How can I evict him ?

Farzad, the information solved my problem.

I just retrieve a reference to the object in the Hibernate session and evict it.

Object pDuplica = pSession.get(entite.getClass(), entite.getIdEvltnAutnm());

if (pDuplica != null) {
pSession.evict(pDuplica);
}

After, I can save my object (entite) with no problem.

Thanks a lot !