[hibernate-issues] [Hibernate-JIRA] Created: (HHH-6997) Acquiring a lock on merging an entity

[Vincent MATHON (JIRA)]

Acquiring a lock on merging an entity
-------------------------------------

                 Key: HHH-6997
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-6997
             Project: Hibernate ORM
          Issue Type: New Feature
          Components: core
    Affects Versions: 4.0.1
         Environment: DB2, Linux, JPA 2, JDK 1.6_29
            Reporter: Vincent MATHON


I would like to acquire a pessimistic lock after a merge:

public T makePersistent(T entity, boolean lock) {
    T mergedEntity = getEntityManager().merge(entity);	
     if (lock) {
	em.flush();// sadly enough, this is necessary in case of insert
	em.lock(mergedEntity, javax.persistence.LockModeType.PESSIMISTIC_READ);
     }	
     return mergedObject;
}

I must trigger a flush to avoid an OptimisticLockException (similar to https://hibernate.onjira.com/browse/HHH-4177) if the entity does not exist yet in database..
It is pity that JPA does not allow for locking in the merge method signature... Couldn't Hibernate be smart enough to not throw any exception in the lock method, nor try to select for update if the mergedEntity is flagged as an entity to insert ? 

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