code: public static SseEventSourceFactory createEventSourceFactory() {
          Class<SseEventSourceFactory>         clazz = SseEventSourceFactory.class;
          ServiceLoader<SseEventSourceFactory> loader = ServiceLoader.load(clazz);
          return loader.iterator().next();    
      }
docs: Creates and returns a new instance of the default implementation of the
  {@link SseEventSourceFactory}.
  
  @return SseEventSourceFactory