docs: public MulticastConfig setGroup(String group) {
      try {
        InetAddress address = InetAddress.getByName(group);
        if (!address.isMulticastAddress()) {
          throw new ConfigurationException("Invalid multicast group " + group);
        }
        return setGroup(address);
      } catch (UnknownHostException e) {
        throw new ConfigurationException("Failed to locate multicast group", e);
      }
    }