code: static @Nullable ServerDuplexConnectionAcceptor findServer(String name) {
      Objects.requireNonNull(name, "name must not be null");
  
      return registry.get(name);
    }
docs: Retrieves an instance of {@link ServerDuplexConnectionAcceptor} based on the name of its {@code
  LocalServerTransport}. Returns {@code null} if that server is not registered.
  
  @param name the name of the server to retrieve
  @return the server if it has been registered, {@code null} otherwise
  @throws NullPointerException if {@code name} is {@code null}