Description of problem:
We have methods in GenericHibernateDAO that flush the session and commit the
transaction. It has explained to me that this was implemented to deal with
NonUniqueObjectExceptions that were getting thrown. I was told that this was (at
least in part) a problem because of the DTOs used with the SalesForces web services.

The Hibernate Session provides a merge operation to address exactly these types
of situations that result in NonUniqueObjectExceptions. In fact, merge() should
be preferred over saveOrUpdate().

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