Networking Help

[rp181]

Hello,
I am working on a java apllication as part of a batch rendering system for over the network. I am trying to get the client to connect to the server, but it keeps failing.

The server network code:
ServerSocket serverSocket = null;
try {
serverSocket = new ServerSocket(18018);
output.append("Creating Socket Success\n");
} catch (IOException e) {
output.append("Error. Could not listen.\n");
}

output.append("Creating Client Socket on port 18018...\n");
Socket clientSocket = null;
try {
clientSocket = serverSocket.accept();
output.append("Accept Success: 18018\n");
} catch (IOException e) {
output.append("Accept failed: 18018\n");
}
String filesss = "";
for(int d = 1; d <= fpc; d++){
filesss = filesss.concat(files[(d+1)*1].toString()+"\n");
}
//output.append("Sending Commands: \n"+filesss+"\n");

PrintWriter out = new PrintWriter(
clientSocket.getOutputStream(), true);



out.println(filesss);
out.close();

clientSocket.close();
serverSocket.close();

================================================== ===
and client code:
================================================== ===


package luxbatchrender_client;
import java.net.*;
import java.io.*;
public class luxbatchrender_client {
public static void main(String[] args) throws IOException{
Socket kkSocket = null;
PrintWriter out = null;
BufferedReader in = null;

try {
kkSocket = new Socket("192.168.2.8", 18018);
out = new PrintWriter(kkSocket.getOutputStream(), true);
in = new BufferedReader(new InputStreamReader(kkSocket.getInputStream()));
} catch (UnknownHostException e) {
System.err.println("Don't know about host: 192.168.2.8");
System.exit(1);
} catch (IOException e) {
System.err.println("Couldn't get I/O for the connection to: 192.168.2.8");
System.exit(1);
}


String fromServer;
fromServer = in.readLine();
System.out.println(fromServer);
out.close();
in.close();
kkSocket.close();


}
}



============================================

I keep getting an exception in the server program at this line:
PrintWriter out = new PrintWriter(clientSocket.getOutputStream(), true);

why is this?

[r035198x]

Are we supposed to guess the exception that you got?
Why can't you tell us?

[rp181]

Im not sure what exception it is. I encased the whole thing in a try wrapper, and in the catch statement, e.getMessage() returns null.

[mrmatt1111]

catch(Exception e)
{
   e.printStackTrace();
}

[rp181]

Thanks for the suggestions, but i fixed it. It turns out the error was completley unrelated to networking, i just put a wrong algorithim to concat a string, and that was returning a null value. For some reasons, netbeans marked the wrong line.

Sorry. :)