error in main

[Pouncer]

	else if (args[0].equals("-s")) {
	    if (args.length < 2) {
		System.out.println("You must specify a port number. E.g, java cw1 -s 231");
	    }
	    else {
		System.out.println("Please enter a secret key which both the client and server will share:");
		BufferedReader r = new BufferedReader(new InputStreamReader(System.in));
		String line = r.readLine().trim();

		
		SECRET_KEY = line;
		
		try { 
		    int port = Integer.parseInt(args[1]);
		    serverStart(port);
		} 
		catch (NumberFormatException e) { 
		    System.out.println("Invalid port number"); 
		}	
	    }   
	}

this is the serverStart method

    public static void serverStart(int port) throws IOException {
	ServerSocket s = new ServerSocket(port);
	System.out.println("Server is now awaiting for incoming connections on port " + port);

	while (true) {
	    try {
		Socket client = s.accept();

		DataOutputStream out = new DataOutputStream(new BufferedOutputStream(client.getOutputStream()));
		DataInputStream in = new DataInputStream(new BufferedInputStream(client.getInputStream()));
	    }
	    catch (Exception e ) {}
	}
    }

so basically in the command line i do
java cw1 -s 123

but before it should start listening on port 123, it should ask me for the key which it does. i enter 'hello' and it gives me error

C:\Documents and Settings\admin\Desktop\Cryptography>java cw1 -s 123
java cw1 -s 123
Please enter a secret key which both the client and server will share:
hello
Exception in thread "main" java.net.BindException: Address already in use: JVM_Bind
	at java.net.PlainSocketImpl.socketBind(Native Method)
	at java.net.PlainSocketImpl.bind(Unknown Source)
	at java.net.ServerSocket.bind(Unknown Source)
	at java.net.ServerSocket.<init>(Unknown Source)
	at java.net.ServerSocket.<init>(Unknown Source)
	at cw1.serverStart(cw1.java:62)
	at cw1.main(cw1.java:36)

[CornedBee]

Never heard of Windows listening on NTP automatically, but who knows ...

Try a much higher port, e.g. 10010. The ports below 1024 are reserved for "well-known services" anyway and often taken.