javax.persistence.lock.scope EXTENDED doesn't properly lock join tables
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                 Key: OPENJPA-1762
                 URL: https://issues.apache.org/jira/browse/OPENJPA-1762
             Project: OpenJPA
          Issue Type: Bug
          Components: jdbc
    Affects Versions: 2.0.1, 2.1.0
         Environment: Derby and DB2
            Reporter: Rick Curtis
         Attachments: OPENJPA-1762.PATCH

I have a simple failing unit test that exercises a small portion of the 
javax.persistence.lock.scope=Extended property. The failing scenario is as 
follows:

ManyToMany relationship between A(owner) and B.

Em1 - Find A, no lock
Em1 - Refresh A, PESSIMISTIC_FORCE_INCREMENT and 
javax.persistence.lock.scope=PessimisticLockScope.EXTENDED -- this SHOULD lock 
the join table for A_B
Em2 - Find, lock B. Remove B.  should block while trying to remove from Join 
table.

I will post the unit test which demonstrates the problem shortly.

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