StaleStateException when saving entity with complex relations

Question

The hibernate entity I am saving in the database (Oracle) has very complex relations, in the sense that it has many related entities. It looks something like this...

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Answer 1

This happened to me under the following circumstances:

• I created objectA in java code.
• I added extant objectB to objectA as a field. objectB has a one to one relation with objectA.
• I saved(created) objectA in the database.

• When objectA was saved, objectB was updated in the database to add the id of objectA.

• Then I added an objectC to objectA (one objectA for many objectCs). I tried to update objectA and got the stalestateexception....even when using merge.

The answer is that I needed to either update objectB or retrieve a fresh istance of objectA from the database