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 JDK,but 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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