}

  @SuppressWarnings("Java8ApiChecker")
  static class MyServerExampleWithCleaner implements AutoCloseable {
    private static final Cleaner cleaner = Cleaner.create();

    private static Runnable closeServerSocketRunnable(
        ServerSocket serverSocket, AtomicBoolean cleanerRan) {
      return () -> {
        try {
          serverSocket.close();
          cleanerRan.set(true);
        } catch (IOException e) {

 *
 *   public MyServer(...) {
 *     ...
 *     this.serverSocket = new ServerSocket(...);
 *     this.cleanable = cleaner.register(this, closeServerSocketRunnable(serverSocket));
 *     ...
 *   }
 *
 *   private static Runnable closeServerSocketRunnable(ServerSocket serverSocket) {
 *     return () -> {
 *       if (!serverSocket.isClosed()) {
 *         ...log a message about how nobody called close()...