java.net.SocketException: Socket is closed

Question

When a user connects to my server, I'm accepting the connection, storing the connected clients details in an arraylist then im trying to send that list to the client to create an asynchronous list. However, when I try to send the list it breaks the connection and causes the error;

java.net.SocketException: Socket is closed

My server class;

        while (true) {                           
            Socket clientSocket = serverSocket.accept();
            ServerClientComs clientThread = new ServerClientComs(clientSocket);
            getUsername(clientSocket, clientThread);
            updateList();                
            try {
                clientThread.sendList(connections);                
                clientThread.initialiseCommunication();                     
                clientThread.start();                                 
            } 
            catch (IOException error) {
                System.out.println("Server: Unable to initialise client thread! - " + error);

            }
        }

ServerClientComs Class;

public ServerClientComs(Socket clientSocket) {
    super();
    this.client = client;
    this.clientSocket = clientSocket;
}

public void initialiseCommunication() throws IOException {
    output = new PrintWriter(this.clientSocket.getOutputStream(), true);
    input = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
}

public void sendList(ArrayList connections) throws IOException
{
    oos = new ObjectOutputStream(this.clientSocket.getOutputStream());
    oos.writeObject(connections);   
    oos.close();
}

Been playing about with this for a good hour, getting annoying now. any help is greatly appreciated!

Mohsen Kamrani · Accepted Answer · 2014-04-16 19:41:36Z

3

A 'Socket closed' exception means that the application that caught the exception closed the socket and then kept trying to use it. Please note that closing the input or output stream of a socket closes the other stream and the socket as well. According to your statements seems you close the stream before using the socket to send data.

answered Apr 16, 2014 at 19:41

Mohsen Kamrani

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4 Comments

horHAY Over a year ago

in my getusername function, i close the BufferedReader input, so im therefore closing the socket?

Mohsen Kamrani Over a year ago

I think due to it's prevalence that's the problem, to get more insight please take a look at this.

Mohsen Kamrani Over a year ago

@horHAY> I'm glad you did it and hope my answer has been useful.

user207421 Over a year ago

'Due to its prevalence'?

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