assertThat(myServer.serverSocket.isClosed()).isFalse();
    return myServer.serverSocket;
  }

  @SuppressWarnings("Java8ApiChecker")
  @Test
  public void testMyServerExampleWithCleaner() throws Exception {
    try {
      Class.forName("java.lang.ref.Cleaner");
    } catch (ClassNotFoundException beforeJava9) {
      return;
    }