SD socket server

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package echoserver;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;

/**
 *
 * @author franc
 */
public class EchoServer {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) throws IOException {
        ServerSocket serverSocket = null;
        try {
            serverSocket = new ServerSocket(7);
        } catch (IOException e) {
            System.err.println("Could not listen on port: 7");
            System.exit(1);
        }
        Socket clientSocket = null;
        try {
            clientSocket = serverSocket.accept();
        } catch (IOException e) {
            System.err.println("Accept failed.");
            System.exit(1);
        }
        PrintWriter out = new PrintWriter(clientSocket.getOutputStream(), true);
        BufferedReader in = new BufferedReader(new InputStreamReader(
                clientSocket.getInputStream()));
        String inputLine;
        while ((inputLine = in.readLine()) != null) {
            out.println(inputLine);
        }
        out.close();
        in.close();
        clientSocket.close();
        serverSocket.close();
    }
}