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

    https://github.com/apache/flink/pull/5220#discussion_r160711940
  
    --- Diff: 
flink-clients/src/main/java/org/apache/flink/client/cli/CliFrontend.java ---
    @@ -515,33 +464,28 @@ protected int stop(String[] args) {
     
                if (stopArgs.length > 0) {
                        String jobIdString = stopArgs[0];
    -                   try {
    -                           jobId = new 
JobID(StringUtils.hexStringToByte(jobIdString));
    -                   }
    -                   catch (Exception e) {
    -                           return handleError(e);
    -                   }
    +                   jobId = new 
JobID(StringUtils.hexStringToByte(jobIdString));
    --- End diff --
    
    Good point. Will throw a more meaningful exception.


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