code: public static void main(String[] args) {
      if (args.length != 0) {
        LOG.info("java -cp {} {}", RuntimeConstants.ALLUXIO_JAR,
            AlluxioJobMaster.class.getCanonicalName());
        System.exit(-1);
      }
  
      CommonUtils.PROCESS_TYPE.set(alluxio.util.CommonUtils.ProcessType.JOB_MASTER);
      AlluxioJobMasterProcess process;
      try {
        process = AlluxioJobMasterProcess.Factory.create();
      } catch (Throwable t) {
        LOG.error("Failed to create job master process", t);
        // Exit to stop any non-daemon threads.
        System.exit(-1);
        throw t;
      }
      ProcessUtils.run(process);
    }
docs: Starts the Alluxio job master.
  
  @param args command line arguments, should be empty