docs: public static void shutdown() {
  
          if (applicationContextCreator.isCreated()) {
              final ConfigurableApplicationContext applicationContext =
                      applicationContextCreator.get();
              applicationContext.close();
          } else {
              final IllegalStateException createException =
                      new IllegalStateException(
                              "No portal managed ApplicationContext has been created, there is nothing to shutdown.");
              getLogger().error(createException, createException);
          }
      }