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Hibernate merge not updating

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From section 15.3 of the JDO 2.2 specification: ===== If two relationships (one on each side of an association) are mapped to the same column, the field on only one side of the association needs to be explicitly mapped.

The field on the other side of the relationship can be mapped by using the mapped-by attribute identifying the field on the side that defines the mapping.

A) The context : Hi, for my project, I used Seam and its Seam Managed Persistence Context.

Although I know this context is designed for Conversation scopes, I did not use them at all (all my application is Session scoped).

hibernate merge not updating-33hibernate merge not updating-79hibernate merge not updating-70hibernate merge not updating-83

@Alex: how does the DIY merge rule out optimistic locking?

In the first case the entity is saved, in the latter case it is updated.

When switching from Hibernate to JPA a lot of people are dismayed to find that method missing. And figuring out what piece of code persisted (or merged or retrieved) that other entity is harder than figuring out why we get a "detached entity passed to persist" message.

B) The problem I had to make forms for different elements. I had to fill the form (name, currency...), view it and modify it.

However, while modifying the form, I had to be able to perform a classic undo (using a hit on my cancel button) and then retrieve the state of my country as it was before I began doing updates...