code: @SuppressWarnings("unchecked")
    public static void main(String[] args) throws IOException {
      JobConf conf = ValueAggregatorJob.createValueAggregatorJob(args
          , new Class[] {WordCountPlugInClass.class});
     
      JobClient.runJob(conf);
    }
docs: The main driver for word count map/reduce program. Invoke this method to
  submit the map/reduce job.
  
  @throws IOException
  When there is communication problems with the job tracker.