Github user rmetzger commented on the pull request:
https://github.com/apache/flink/pull/304#issuecomment-70467240
I guess you are referring to this commit?
https://github.com/apache/flink/commit/020b282bdc5468aa51b231e9ae8d4d3a1a76e696
I don't see a reason NOT to add commonly used types to Kryo by default. We
shouldn't claim full Jodatime support anywhere. But having for example
Jodatime's DateTime activated by default will lead to a much better user
experience.
If there were more users using other classes from Jodatime, there would be
serializers for it.
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