A2 finished.

src/blatt2/ServerStop.java

@@ -1,20 +1,25 @@
 package blatt2;
 
+import java.net.InetSocketAddress;
 import javax.swing.JOptionPane;
+import blatt1.ClientEndpoint;
 
 public final class ServerStop implements Runnable {
 
 	private ThreadPooledPrimeServer server;
+	private ClientEndpoint endpoint;
 
 	public ServerStop(ThreadPooledPrimeServer server) {
 		this.server = server;
+		endpoint = new ClientEndpoint();
 	}
 
 	@Override
 	public void run() {
 		JOptionPane.showMessageDialog(null, "Press OK to stop server.");
 
 		server.exit = true;
+		endpoint.send(new InetSocketAddress("localhost", 4711), 1);
 	}
 
 }

src/blatt2/ThreadPooledPrimeServer.java

@@ -8,6 +8,7 @@ public final class ThreadPooledPrimeServer {
 
 	private ExecutorService executor;
 	private final ServerEndpoint endpoint;
+
 	public volatile boolean exit;
 
 	private static final int MAX_THREADS = 2;
@@ -24,9 +25,11 @@ void run() {
 
 		new Thread(new ServerStop(this)).start();
 
-		while (!exit)
+		while (true)
 		{
 			ServerEndpoint.Request request = endpoint.blockingReceive();
+			if (exit)
+				break;
 			PrimeCalculator calc = new PrimeCalculator(endpoint, request);
 			executor.execute(calc);
 		}