第二条消息发送但未收到客户端的响应

Question

我对Java Server应用程序有一个奇怪的问题。客户端连接没有问题。它发送第一条消息并且服务器回复，然后客户端没有问题地收到答案。然后，客户端发送第二条消息，服务器读取此消息并回答没有问题，但客户端没有收到也没有看到答案。

这是代码，你看错了吗？也许问题出在客户端应用程序中，但我无法访问其代码。

public static final int puerto = 5698;

private static ServerSocket serverSocket;
private static Socket clientSocket;
private static DataInputStream streamFromClient;
private static DataOutputStream streamToClient;
private static final byte[] buffer_msg = new byte[4096];
private static int length_message_received;
private static byte[] message;


public static void main(String[] args) 
{    
    try
    {
        serverSocket = new ServerSocket(puerto);
    }
    catch (IOException ex) 
    {
        System.exit(0);
    }

    while ( true )
    {
        try
        {
            clientSocket = serverSocket.accept();

            streamFromClient= new DataInputStream(clientSocket.getInputStream());
            streamToClient= new DataOutputStream(clientSocket.getOutputStream());

            while ( true )
            {
                length_message_received= streamFromClient.read(buffer_msg);

                if ( length_message_received< 0 )
                    break;

                message= new byte[length_message_received];

                System.arraycopy(buffer_msg, 0, message, 0, length_message_received);


                //THIS METHOD CREATES THE ANSWER
                byte answer[] = answerer(message);


                streamToClient.write(answer);
            }
            streamFromClient.close();
            streamToClient.close();
            clientSocket.close();
        }
        catch (IOException ex) 
        {

        }
    }
} 

抱歉我的英文。如果你不了解某些事情，请告诉我。