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Cascading update problem

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Hi, I am doing some little tests to understand some of the behaviour of hibernate (v3.1) and would like some advice.

I have a bidirection parent child relationship as follows:




I open a session and get a parent from the database and any chilren are eagerly fetched (ignore the fact that i am eagerly loading a collection this is for a test only). Session closed.

I then create a new child and add it to the parent. Then, in a new Session, update the parent object, resulting in the transient child being persisted. All well and good.

The behaviour i am also seeing is that hibernate is updating all the children even though their state has not changed.

I understand that instead of updating the parent i could save the child and this would prevent the other children being updated. What i would like to know is their a way of configuring hibernate or the relationship so that i can update the parent and persist new children without hibernate firing updates on all the other children.

Any help would be greatly appreciated.

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