code: @Test public void testIssue() throws Exception {
    int port=SocketUtil.getAvailablePort();
    WebSocketClient webSocket0=new WebSocketClient(new URI("ws://localhost:" + port)){
      @Override public void onOpen(    ServerHandshake handshakedata){
      }
      @Override public void onMessage(    String message){
      }
      @Override public void onClose(    int code,    String reason,    boolean remote){
        countDownLatch0.countDown();
      }
      @Override public void onError(    Exception ex){
      }
    }
  ;
    WebSocketClient webSocket1=new WebSocketClient(new URI("ws://localhost:" + port)){
      @Override public void onOpen(    ServerHandshake handshakedata){
      }
      @Override public void onMessage(    String message){
      }
      @Override public void onClose(    int code,    String reason,    boolean remote){
      }
      @Override public void onError(    Exception ex){
      }
    }
  ;
    WebSocketServer server=new WebSocketServer(new InetSocketAddress(port)){
      @Override public void onOpen(    WebSocket conn,    ClientHandshake handshake){
      }
      @Override public void onClose(    WebSocket conn,    int code,    String reason,    boolean remote){
      }
      @Override public void onMessage(    WebSocket conn,    String message){
      }
      @Override public void onError(    WebSocket conn,    Exception ex){
      }
      @Override public void onStart(){
        countServerDownLatch.countDown();
      }
    }
  ;
    server.start();
    countServerDownLatch.await();
    webSocket0.connectBlocking();
    assertTrue("webSocket.isOpen()",webSocket0.isOpen());
    webSocket0.close();
    assertTrue("webSocket.isClosing()",webSocket0.isClosing());
    countDownLatch0.await();
    assertTrue("webSocket.isClosed()",webSocket0.isClosed());
    webSocket1.connectBlocking();
    assertTrue("webSocket.isOpen()",webSocket1.isOpen());
    webSocket1.closeConnection(CloseFrame.ABNORMAL_CLOSE,"Abnormal close!");
    assertTrue("webSocket.isClosed()",webSocket1.isClosed());
    server.stop();
  }
  