Optimize exception check #13
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Use
ExceptionCheck()for the initial check (which doesn't need to create a local reference) and only callExceptionOccurred()to retrieve thejthrowablewhen we already know there is a pending exception.https://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#exception_check
https://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp16124
No user code is broken. This change is a pure optimization.