多个无效的流头

Question

我在ByteArray和Object流方面遇到问题。我正在通过NIO服务器创建一个多人纸牌游戏。我通过以下方法发送ArrayList private ArrayList<Card> cardsDropped：

public void sendMessage(Object message) {
    if (message instanceof String) {
        messages.add(message + Config.MESSAGE_DELIMITER);
    } else {
        messages.add(message);
    }
    SelectionKey key = channel.keyFor(selector);

    key.interestOps(OP_WRITE);
}

使用private final LinkedList<Object> messages，这是流中通过发送的所有对象的列表 ->客户端方法：

protected void handleIncomingData(SelectionKey sender, byte[] data) throws IOException {
    ByteArrayInputStream byteObject = new ByteArrayInputStream(data);
    ObjectInputStream obj;
    in = null;

    try {
        obj = new ObjectInputStream(byteObject);   //HERE <--
        byteObject.close();
        in = obj.readObject();
        obj.close();
    } catch (ClassNotFoundException e) {
        e.printStackTrace();
    }

    handler.onMessage(in);
}

protected void write(SelectionKey key) {
    SocketChannel channel = (SocketChannel) key.channel();

    while (!messages.isEmpty()) {
        ByteArrayOutputStream byteObject = new ByteArrayOutputStream();
        ObjectOutputStream oos = null;

        try {
            oos = new ObjectOutputStream(byteObject);
            oos.writeObject(messages.poll());
            oos.flush();    //TODO ?
            oos.close();
            channel.write(ByteBuffer.wrap(byteObject.toByteArray()));
            byteObject.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    key.interestOps(OP_READ);
}

和服务器方法：

protected void write(SelectionKey key) {
    ByteBuffer buffer = (ByteBuffer) key.attachment();
    SocketChannel channel = (SocketChannel) key.channel();

    try {
        channel.write(buffer);
    } catch (IOException e) {
        e.printStackTrace();
    }
}

protected void handleIncomingData(SelectionKey sender, byte[] data) throws IOException {
    for (SelectionKey key : selector.keys()) {
        if (key.channel() instanceof ServerSocketChannel) {
            continue;
        }

        if (key.equals(sender)) {
            continue;
        }

        key.attach(ByteBuffer.wrap(data));
        write(key);
    }
}

一些回合和卡片发送后，客户端线程在这里obj = new ObjectInputStream(byteObject);向我发送了一些“无效的流头”

这是与服务器/客户端代码的编写方式有关的问题吗？ [代码基于https://github.com/mpkelly/nio-chat]

谢谢！