Github user rmetzger commented on the pull request:
https://github.com/apache/flink/pull/1048#issuecomment-135759647
In the first version of this pull request I was sending a `JobFailure(st:
SerializedThrowable)` in case of an error.
The `SerializedThrowable` did not extend Exception. This way, users had to
really manually turn the response into a Throwable.
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