yantzu commented on issue #223: [LIVY-658]RSCDriver should catch exception if cancel job failed during shutdown URL: https://github.com/apache/incubator-livy/pull/223#issuecomment-527774511 Without catch cancel exception, the original exception("scala.refrect.internal.FactalError: object Predef does not have a member classOf" in the screen-shoot) is concealed by NullPointerException, it is not easy to find application error root cause(which is FactalError in this case). @runzhiwang
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