I tried to save an object loaded in previous session
and hibernate throws nonUniqueObject exception

i have cleared the session (session.clear()) before updating


// in the first session
Cat cat = (Cat) firstSession.load(Cat.class, catId);
// in a higher tier of the application
cat.setMate(potentialMate);
// later, in a new session
secondSession.clear();
secondSession.update(cat); // update cat


but if I load a new instance (with the same identifier),
it works


// in the first session
Cat cat = (Cat) firstSession.load(Cat.class, catId);
// in a higher tier of the application
cat.setMate(potentialMate);
// later, in a new session
Cat cat1 = (Cat) firstSession.load(Cat.class, catId);
cat1.setMate(cat.getMate());
secondSession.update(cat1); // update cat

I dont use versioning.. and using hibernate 2.1.3
can anyone give me a hint ?

thanks

In the second case, Hibernate will give you the SAME instance of Cat.

If cat instances are the same, then this myObject.setMate(myObject);

there is nothing wrong here with hibernate as I see.
After you change the mate property of the cate, u need to update cat object or else your changes can not be reflected to the database.

// in the first session
Cat cat = (Cat) firstSession.load(Cat.class, catId);
// in a higher tier of the application
cat.setMate(potentialMate);
session.update(cat)
// later, in a new session
Cat cat1 = (Cat) firstSession.load(Cat.class, catId);
cat1.setMate(cat.getMate());
secondSession.update(cat1); // update cat
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Well.. its not the actual case.. i just use the code in the docs to make it simple

turns out that the error due to unlazy initialization
I load the parent object, hibernate automatically load the children
and then I load another instance of the children..
update it.. boom.. error :)