ConnectException

[tnrh1]

I can't figure out why do I get this exception:

java.net.ConnectException: Connection refused: connect
Exception in thread "main" java.lang.NullPointerException
at Client.main(Client.java:31)

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


public class Server
{
	public static void main(String[]args) throws IOException
	{
		ServerSocket serverSocket = null;
		Socket clientSocket = null;
		PrintWriter out = null;
		BufferedReader in = null;
		
		try
		{
			serverSocket = new ServerSocket(4441);
			clientSocket = serverSocket.accept();
			out = new PrintWriter(clientSocket.getOutputStream(),true);
			in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
		}
		catch(Exception e)
		{
			System.out.println(e);
		}
		
		System.out.println(in.readLine());
		
		serverSocket.close();
		clientSocket.close();
		in.close();
		out.close();
	}
}

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


public class Client
{
	public static void main(String[]args) throws IOException
	{
		Socket echoSocket = null;
		PrintWriter out = null;
		BufferedReader in = null;
		
		try
		{
			echoSocket = new Socket("81.218.161.218",7);
			out = new PrintWriter(echoSocket.getOutputStream(),true);
			in = new BufferedReader(new InputStreamReader(echoSocket.getInputStream()));
		}
		catch(Exception e)
		{
			System.out.println(e);
		}
		
		BufferedReader stdIn = new BufferedReader(new InputStreamReader(System.in));
		String userInput;
		
		out.println("I'm the client");
		
		out.close();
		in.close();
		stdIn.close();
		echoSocket.close();
		
	}
}

Thanks in advanced.

[quad64bit]

Are you trying to run these on the same computer? 81.218.161.218 looks like an outside world address, if on the same machine, what does the loop-back address do? (127.0.0.1)

[tnrh1]

81.218.161.218 is my ip, I get the same error for "localhost" and "127.0.0.1".
Thanks for replaying.

[quad64bit]

Ok, and you are running both the client and the server on the same computer?

If that's the case, then your port numbers need to match. On most OS' ports 1-1024 are reserved for OS, so use something like 1234 or 5555, or something else. Then both your server and client need to use the same port.

I see your server socket is port 4441 and your client is 7. Don't use 7.

[tnrh1]

Thank you so much.
Diffrent ports was the problem.

[quad64bit]

No problem!