Update: Server keeps running, all errors caught.

src/main/java/de/hdm_stuttgart/battlearena/Model/Multiplayer/TestServer/Client.java

@@ -22,8 +22,7 @@ public class Client {
 
     public String sendMessage(String msg) throws IOException {
         out.println(msg);
-        String resp = in.readLine();
-        return resp;
+        return in.readLine();
     }
 
     public void stopConnection() throws IOException {

src/main/java/de/hdm_stuttgart/battlearena/Model/Multiplayer/TestServer/ConnectionHandling.java

@@ -10,9 +10,5 @@ public class ConnectionHandling {
         String resp1 = client.sendMessage("hello");
         System.out.println(resp1);
 
-        Client client1 = new Client();
-        client1.startConnection("localhost", 4444);
-        String resp2 = client1.sendMessage("hello");
-        System.out.println(resp2);
     }
 }

src/main/java/de/hdm_stuttgart/battlearena/Model/Multiplayer/TestServer/Server.java

@@ -25,6 +25,8 @@ public class Server {
         serverSocket.close();
     }
 
+    // EchoClientHandler class in the Server
+
     private static class EchoClientHandler extends Thread {
         private Socket clientSocket;
         private PrintWriter out;
@@ -37,49 +39,43 @@ public class Server {
         public void run() {
             try {
                 out = new PrintWriter(clientSocket.getOutputStream(), true);
-            } catch (IOException e) {
-                throw new RuntimeException(e);
-            }
-            try {
-                in = new BufferedReader(
-                        new InputStreamReader(clientSocket.getInputStream()));
-            } catch (IOException e) {
-                throw new RuntimeException(e);
-            }
+                in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
 
-            String inputLine;
+                String inputLine;
 
-            try {
-                while ((inputLine = in.readLine()) != null) {
+                while (clientSocket.isConnected() && (inputLine = in.readLine()) != null) {
                     System.out.println("Received message from client: " + inputLine);
-                    try {
-                        if ((inputLine = in.readLine()) == null) break;
-                    } catch (IOException e) {
-                        throw new RuntimeException(e);
-                    }
+
                     if (".".equals(inputLine)) {
                         out.println("bye");
+                        out.flush();
+                        System.out.println("Sent response to client: bye");
                         break;
                     }
+
                     out.println(inputLine);
                     out.flush();
+                    System.out.println("Sent response to client: " + inputLine);
                 }
+            } catch (SocketException e) {
+                // Connection reset by client; no need to print a stack trace
+                System.out.println("Client connection reset.");
             } catch (IOException e) {
-                throw new RuntimeException(e);
+                // Other IOExceptions - log or handle as needed
+                e.printStackTrace();
+            } finally {
+                try {
+                    in.close();
+                    out.close();
+                    clientSocket.close();
+                } catch (IOException e) {
+                    // Log the exception or handle as appropriate for your application
+                    e.printStackTrace();
+                }
             }
+        }
 
 
-            try {
-                in.close();
-            } catch (IOException e) {
-                throw new RuntimeException(e);
-            }
-            out.close();
-            try {
-                clientSocket.close();
-            } catch (IOException e) {
-                throw new RuntimeException(e);
-            }
-        }
     }
+
 }