#731 Add @RequiresUnitOfWork annotation #959
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Implementation of a @RequiresUnitOfWork annotation equivalent to the @transactional annotation. One that will automatically start/stop a UnitOfWork as required, but not begin/commit a transaction. See issue #731 for more info. I think this annotation can be interesting, I have also missed it often.
The name of the annotation is important as it's public, and so can be changed. Please check if you like it and change it accordingly.
This pull request also includes a refactoring of JpaLocalTxnInterceptor class, extracting the management of the unit of work to a new utility UnitOfWorkHandler class, which can also be handy to start / end units of work by code (instead of with annotations). Finally, it also solves issue #753 (JpaLocalTxnInterceptor is inconsistent. It uses both UnitOfWork and JpaPersistService), by using the same UnitOfWork injected object to both begin and finish it.