SQLException during value generation causes (non transactional) connection leak #79
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Test cases that reproduces the problem reported under datanucleus/datanucleus-rdbms#501
Both of the above will fail with lock timeout exception since the "random exception" triggers the leak and the leaking connection is not closed preventing all subsequent operations to complete.
To simulate a failure on commit I used a small jdbc proxy project that can be configured to generate failures on certain operations:
https://github.com/zabetak/jdbc-faulty