Versioned Optimistic Locking And Detached Entities Sample
Description: This is a sample application that shows how versioned (@Version) optimistic locking and detached entity works. Running the application will result in an optimistic locking specific exception (e.g., the Spring Boot specific, OptimisticLockingFailureException).
Key points:
- in a transaction, fetch an entity via
findById(1L); commit transaction and close the Persistence Context - in a second transaction, fetch another entity via
findById(1L)and update it; commit the transaction and close the Persistence Context - outside transactional context, update the detached entity (fetched in the first transaction)
- in a third transaction, call
save()and pass to it the detached entity; trying to merge (EntityManager.merge()) the entity will end up in an optimistic locking exception since the version of the detached and just loaded entity don't match
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