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EM close causes an exception

temporary file that holds information about uncommitted flushed updates when the EntityManager ... your company. It was added to support large flush operations. Since this is a hidden feature ... in development) will add better support for large flush operations. However, we cannot provide

javax.persistence.EntityExistsException

at flush or commit time. The current transaction, if one is active, will be marked

persist(entity)

another PersistenceException may be thrown at flush or commit time.)

javax.persistence.LockTimeoutException

may be thrown as part of an API call, at, flush or at commit time. The current transaction, if one is active

javax.persistence.OptimisticLockException

when an optimistic locking conflict occurs. This exception may be thrown as part of an API call, a flush or

clear()

made to entities that have not been flushed to the database will not be persisted.

preStore(event)

/PersistenceManager/flush" title="Method of javax.jdo.PersistenceManager">javax.jdo.PersistenceManager.flush or

postStore(event)

/PersistenceManager/flush" title="Method of javax.jdo.PersistenceManager">javax.jdo.PersistenceManager.flush or

javax.jdo.annotations.Unique

to reorder database operations when flushing changes to avoid unique constraint violations. Corresponds

makePersistent(pc)

checking is required by the application, then flush or checkConsistency should be called