code: @Override
      public void stop(Future<Void> stopFuture) throws Exception {
          // Stop the real verticle
          if (realVerticle != null) {
              realVerticle.stop(stopFuture);
              realVerticle = null;
          }
      }
docs: Vert.x calls the stop method when the verticle is undeployed.
  Put any cleanup code for your verticle in here
  
  @throws Exception