[GitHub] zeppelin issue #2486: [ZEPPELIN-2768]. Bump up Spark version to 2.2.0

[zjffdu]

Github user zjffdu commented on the issue:

    https://github.com/apache/zeppelin/pull/2486
  
    One workaround for spark 2.2 is that user could specify JAVA_HOME in its 
interpreter setting. I have verified it. 
    
    
![image](https://user-images.githubusercontent.com/164491/28148316-76461c0a-67b8-11e7-964f-197232fcb729.png)
    
    For JDK 8 support of Zeppelin, I think we could do it in another PR if it 
is OK to upgrade to JDK8 for all the components of Zeppelin. We may need to 
discuss it in community first. 


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