code: public void shutdown() {
          if (bootstrapped.compareAndSet(true, false)) {
              LOGGER.info("Shutting down Jashing...");
  
              injector.getInstance(ServiceManager.class).stopAsync().awaitStopped();
              injector.getInstance(JashingServer.class).stopAsync().awaitTerminated();
  
  
              /* shutdown method might be called by this hook. So, trying to remove
               * hook which is currently is progress causes error
               */
              if (!shutdownHook.isAlive()) {
                  Runtime.getRuntime().removeShutdownHook(shutdownHook);
              }
              LOGGER.info("Jashing has stopped.");
          } else {
              throw new IllegalStateException("Jashing is not bootstrapped");
          }
      }
docs: Shutdowns Jashing. Permitted only for bootstrapped instance