You mixed the lines.
You must write:
| (...)
| a.setName("F002");
| em.merge(a);
| (...)
|
If you call persist or merge on an entity manager, the entity manager
recognizes the state of the entities at this time. Changes which are made later
to the entities doesn't bother him if they aren't followed by a merge
operation. If the entity manager leaves the scope of a transaction, he persists
the entitie states to the database.
Thats the reason why your entity isn't updated.
Best regards
Meinert
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