hi,

I am stuck with a annoying net.sf.hibernate.NonUniqueObjectException. Assume a entity 'Blueprint' that can have multible entities 'Relation' to it. Relation itself has two 'Blueprints' called 'LeftClass' and 'RightClass'. If have two Relations assigned two a 'Blueprint' that both have the same 'Blueprint' as 'RightClass', hibernate starts crying (actually I am near to crying, too)

I know, I can't use a find() or a load() if I am setting an object that already is associated to the session, and - I swear - I am trying to set all associations using references to exisiting instances. But, why is the get() method not working? I understand the documentation for get() in that way, that I can avoid instanciating a new object but get a reference to the existing instance if it is already loaded by the session.

I think the problem is: I have a Relation attached to my Blueprint. Save. Done. Now I open a new hibernate session, retrieve my BluePrint, add another Relation with the same "RightClass" thus leading to a instance of the "RightClass" by using get() and another instance that is already associated by the first Relation.

Is there a way to make hibernate manage than instance-stuff? I tried using 2.1.3 and 2.1.4. It is a little hard to paste some code because hibernate is deeply burried in my app, by now.

thanks
marie

why is it necessary to have multible instances of an entity in a single session, anyway? Why can't hibernate give me the one instance, independently of what I am using to get the object. Using a finder would be great sometimes, instead I have to iterate through Collections and stuff to get access!

thanks marie

Try to isolate your problem in a simple testcase - if it persists, show the code.