Read multiple lines using BufferedReader (Socket)

I already read some threads here on stackoverflow, also some tutorials, but I don't find a solution to my problem.

I have Java client which connects to a server, then sends exactly one line to the server, and I get 2 or 3 lines as a response.

Here is my code:

public static void main(String[] args) {
    String message;
    String response;

    try {
        BufferedReader inFromUser = new BufferedReader( new InputStreamReader(System.in));
        Socket clientSocket = new Socket(hostname, port);
        DataOutputStream outToServer = new DataOutputStream(clientSocket.getOutputStream());
        BufferedReader inFromServer = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
        message = inFromUser.readLine();
        outToServer.writeBytes(message + '\n');

        // here my program "freezes"
        while ((response = inFromServer.readLine()) != null) {
          System.out.println("response: " + response);
        }
        clientSocket.close();
    } catch (UnknownHostException e) {
        System.out.println("Unknown Host");
    } catch (IOException e) {
        System.out.println("IO Exception");
    }
}

My problem is, I can read every line of the response, but my program won't exit. The line clientSocket.close(); gets never called. What am I doing wrong?