code: public static void shutDown()
      {
          if (Quartz.QUARTZ != null && Quartz.QUARTZ.scheduler != null) {
              try {
                  Quartz.QUARTZ.scheduler.shutdown();
              } catch (final SchedulerException e) {
                  Quartz.LOG.error("Problems on shutdown of QuartsSheduler", e);
              }
          }
      }
docs: ShutDown Quartz.