Currently couple of bidirectional associations do not use inverse="true" on one-to-many side (collection)

The examples are

• ProcessInstance.instances
• CompositeLog.children

I'm sure there are more of them.
Lack of inverse="true" results in additional "UPDATE" statement being issued by hibernate to create a relationship from a one-to-many side.
This is not necessary when java code is updating both ends of an association.

Some use-cases where lots of new processes are being created would see a performance improvement.
CompositeLog logging overhead will decrease (only INSERT will be issued - no UPDATE)

Please consider reviewing all of your bidirectional associations with respect to this optimization.