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

The error can be caused by several things:

1. Flushing the data before committing the object may lead to clear all object pending for persist.
2. If object has primary key which is auto generated and you are forcing an assigned key
3. if you are cleaning the object before committing the object to database.
4. Zero or Incorrect ID: If you set the ID to zero or something else, Hibernate will try to update instead of insert.
5. Object is Stale: Hibernate caches objects from the session. If the object was modified, and Hibernate doesn’t know about it, it will throw this exception — note the StaleStateException

I'm not taking the credit for it, found it here.