code: public void onModuleLoad() {
          GWT.setUncaughtExceptionHandler(new GWT.UncaughtExceptionHandler() {
              @Override
              public void onUncaughtException(Throwable e) {
                  logger.log(SEVERE, "UncaughtException", e);
              }
          });
          Scheduler.get().scheduleDeferred(new Scheduler.ScheduledCommand() {
              @Override
              public void execute() {
                  //load map v3 api
                  MapLoadUtil.loadMapApi(new Runnable() {
                      public void run() {
                          loadVisualisationApi();
                      }
                  });
              }
          });
      }
docs: This is the entry point method.