Mine

import java.io.*;
import java.net.*;
import static java.lang.System.out;

class Server {
	public static void main(String args[]) {
		
		ServerSocket serverSocket;
		
		try {
    		serverSocket = new ServerSocket(72);
		} catch (IOException e) {
			die("Could not listen on port 72!");
		}
	
	Socket clientSocket = null;
	try {
    	clientSocket = serverSocket.accept();
	} catch (IOException e) {
		die("Could not accept connection!");
	}
	
	}
	
	public static void die(String text) {
		out.println(text);
		System.exit(0);
	}
}