Wrap Rspec before and example blocks with a mutex for JRuby #537
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A better implementation of 205 / fc548e7#diff-053aa3ea46cb7c6a649e0d0fc592ce729b66e1d44be475516fd58857ba695862R14 which in hindsight doesn't actually look functional because it wraps the entire before/example/after with a mutex, rather than wrapping individual components.
The intention is to avoid this sort of error when a class method is stubbed: