Using Hibernate with non-updatable fields can leave entities in a
confused state.
Take an Image with a field creationEvent, not updatable. If
Image.creationEvent is set on an instance and passed to session.merge(),
then:
(1) Properly, no UPDATE is issued.
(2) DefaultMergeEventListener.copyValues copies the invalid
creationEvent to the new instance
(3) The client who receives that instance thinks creationEvent has been
successfully updated.
What are the semantics here? Should the spec specify this? Max, you
mentioned via irc that this wasn't in the spec, but I assume
@Column( updatable = false )
would cause the same issue.
Currently I'm writing logic in my MergeEventListener to NOT copy these
values (difficult because of the EmbeddedComponentTypes I'm using). It
seems, however, that this should be belong directly to
DefaultMergeEventListener.
Opinions?
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