Hi guys,

I have a real issue with cloning objects. I use session.merge(Object o) and it works fine, but after merge all the collections of the original object just get connected to the new object, so the target object just gets all the collections and the source object loses them. As I understand cascade=merge has to solve the problem, but not in my case.

Maybe someone has idea, how can I fix it?

Thank you very much in advance, and I'm sorry if it's somewhere in docs or forum, I honestly searched for solution for a couple of hours and here I am...


Hibernate version:
3.2.0

Can you post your code where you are doing this stuff and more important also mention what do you expect the result to be.

I feel the problem is around you understanding of merge().

Hi *monu,

what I basically do is:

1) Make a clone of the MyObject o (with DeepCopy)
2) set a o.ID to Null
2) Session.merge(o).

MyObject has couple of collections, particularly maps with composite ID MyObject.compositeIdDetail(ID:[product_id, locale] , name)

and particularly bags with real ID, like:

MyObject.realIdDetail(ID, product_id, name, locale, text)

I have no problems with these composite ID collections, but the details with a real ID are just getting rewritten with an ID of the new Object.

What I want is a real clone, incl. all collections.

Hi guys, problem solved.

I just had to iterate all the collections with a real ID (not a composite one) and set their IDs to null before merging.