Github user voyageth commented on the issue:
https://github.com/apache/zeppelin/pull/1144
@jongyoul I change this just for more stability. I can't find that bug case
just now. But if some Connection or Statement's close() method has some
bug(like NPE is some circumstance), zeppelin can not clear that resource.
But if you think Exception is too much, I'll change SqlException.
Thanks for feedback.
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