docs: public NotificationRegistration readNotificationRegistration(InputStream in) throws ConversionException, IOException, ClassNotFoundException {
          JSONObject json = parseObject(in);
          NotificationRegistration ret = new NotificationRegistration();
          ret.objectName = readObjectName(json.get(N_OBJECTNAME));
          ret.filters = readNotificationFiltersInternal(json.get(N_FILTERS));
          return ret;
      }