Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/2685#issuecomment-61053147
@zhzhan they can both exist. The issue is that Spark uses a library Chill
that requires Kryo 2.21. If 2.21 and 2.22 are not binary compatible, this will
break it and there is no solution. If 2.21 and 2.22 are binary compatible, then
we can get away with it, but we may need to add objeneiss explicitly because
IIRC chill directly uses the original objenesis packages.
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