docs: public EndpointManager<TcpIpConnection> getEndpointManager(EndpointQualifier qualifier) {
          EndpointManager<TcpIpConnection> mgr = endpointManagers.get(qualifier);
          if (mgr == null) {
              logger.finest("An endpoint manager for qualifier " + qualifier + " was never registered.");
          }
  
          return mgr;
      }