update

src/main/java/com/university/chat/Client/ServerListener.java

@@ -27,6 +27,9 @@ public class ServerListener implements Runnable{
                     System.out.println("[File received] '" + file.getFilename()
                             + "' from " + file.getSender());
                 }
+                else if (obj instanceof String str) {
+                    System.out.println(str);
+                }
             }
 
         } catch (Exception e){

src/main/java/com/university/chat/Server/ClientSession.java

@@ -94,6 +94,7 @@ public class ClientSession implements Runnable {
                 ClientSession receiver = userManager.getUser(msg.getReceiver());
                 if (receiver != null) {
                     receiver.sendMessage(msg);
+                    sendMessage("Message sent!");
                 }
                 else {
                     sendMessage(new ChatMessage(MessageType.PUBLIC_MESSAGE, "Server", username, "User '" + msg.getReceiver() + "' is not online."));