NicoK commented on issue #7033: [FLINK-10419][checkpoint] fix ClassNotFoundException while deserializing user exceptions URL: https://github.com/apache/flink/pull/7033#issuecomment-436647987 True, this only helps with the old non-Flip6 code. I guess, the `declineCheckpoint()` RPC method should have a `DeclineCheckpoint` parameter instead which then properly wraps the exception using this code. At the moment, I don't have time to follow-up on this though - closing for now in the hopes that someone else can take over maybe re-using this code (or going another way).
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