[GitHub] helix pull request #200: throw new Exception to avoid ugly NPE

[lujiefsi]

Github user lujiefsi commented on a diff in the pull request:

    https://github.com/apache/helix/pull/200#discussion_r185154949
  
    --- Diff: 
helix-core/src/main/java/org/apache/helix/tools/commandtools/ZkGrep.java ---
    @@ -463,9 +463,8 @@ static File gunzip(File zipFile) {
           return outputFile;
         } catch (IOException e) {
           LOG.error("fail to gunzip file: " + zipFile, e);
    +      throw new Exception("fail to gunzip file" + zipFile);
    --- End diff --
    
    why not we check the null in ZkGrep#processCommandLineArgs:
    if (lastZkSnapshot == null){
      LOG.error("fail to gunzip file" + zkDataDirs[1]);
       System.exit(1);
    }
    
    @brettKK 


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