Github user shijinkui commented on the issue:
https://github.com/apache/flink/pull/2458
hi, @StephanEwen
There are much difference between JDK 6 and JDK 7+. It's better for
compatible low version JDKï¼but there are better performance for Scala with
Lambda support, and JDK 7 and 8 are enhanced on many features.
Now JDK7 is wide used. Give up JDK 6 compatible. It's clearly for
developer: use JDK 7+ features relieved
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