Thread: My chat program's multi threaded server keeps on throwing exceptions when calling nextLine();

package chatprogram;
 
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.Socket;
import java.util.Iterator;
import java.util.Scanner;
import java.util.Vector;
 
public class SunChatServerChild extends Thread {
 
	static Scanner in;
	static PrintWriter out;
	//static HashSet<PrintWriter> writerSet = new HashSet<PrintWriter>();
	//static HashSet<String> names = new HashSet<String>();
	static Vector<PrintWriter> wV = new Vector<PrintWriter>();
	static Vector<Scanner> sV = new Vector<Scanner>();
	static Socket sock;
	static int n;
 
	public SunChatServerChild(Socket s, int cN) {
		sock = s;
		n  = cN;
	}
 
	public void run() {
		super.run();
		try {
				in = new Scanner(new InputStreamReader(sock.getInputStream()));
				out = new PrintWriter(new OutputStreamWriter(sock.getOutputStream()), true);
				wV.add(out);
				while (true) {
					String fromClient = in.nextLine(); // <--- problem right here when multiple clients are connected and chatting
					broadCastMsg(fromClient);
				}
		} catch (IOException e) {
		} finally {
			in.close();
			out.close();
		}
	}
	private void broadCastMsg(String fromClient) {
		Iterator<PrintWriter> it = wV.iterator();
		while (it.hasNext()) {
			PrintWriter writer = it.next();
			writer.println(fromClient);
			writer.flush();
		}
	}
}

cant figure out whats wrong, the program usually throws OutOfBoundsIndex, or NoSuchElementException: No line found.
Doesn't the the Server sit on the nextLine() until the client sends out a message. This only occurs when I have more than one client, and sometimes it works for a few messages back and forth then it throws the exceptions.

Why is your catch block empty? You shouldn't do that, and should at least print a stack trace there.

Nvm error has been resolved from using magical logic. Somehow my teachers identical code manages to run it flawlessly... : /

That's great, but still I urge you not to use empty catch blocks which is the coding equivalent of driving a car with blindfolds on.

Will take that into account! I finally understood what the bug was... I made the Scanner static so I believe every thread was sharing the same Scanner.