code: public static JettyService forServer(String hostname, Server jettyServer) {
          requireNonNull(hostname, "hostname");
          requireNonNull(jettyServer, "jettyServer");
          return new JettyService(hostname, blockingTaskExecutor -> jettyServer);
      }
docs: Creates a new {@link JettyService} from an existing Jetty {@link Server}.
  
  @param hostname the default hostname
  @param jettyServer the Jetty {@link Server}