Failed transactions must generate more focussed (and accurate) message for the 
cause
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                 Key: OPENJPA-1160
                 URL: https://issues.apache.org/jira/browse/OPENJPA-1160
             Project: OpenJPA
          Issue Type: Bug
          Components: kernel
            Reporter: Pinaki Poddar


OptimisticException is overused as a generic cause of many kinds of failure 
during a commit or flush (which at times are not directly related to a 
optimistic concurrency violation per se).
Given that the error message is often the first handle to analyze a fault, we 
should 
a) analyze all places that raise OptimisticLockexception 
b) attempt to narrow the exception or at least provide a differentiated message 
for the cause to the user

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