fix: temporyy fix for NPE and wrong naming

src/main/java/ch/unibas/dmi/dbis/cs108/casono/client/ui/chatui/ChatViewController.java

@@ -23,20 +23,28 @@ public class ChatViewController {
     private final ChatController controller;
     private final Timer timer;
 
-    @FXML private VBox chatVBox;
+    @FXML
+    private VBox chatVBox;
 
-    @FXML private TextField inputField;
+    @FXML
+    private TextField inputField;
 
-    @FXML private ScrollPane chatScrollPane;
+    @FXML
+    private ScrollPane chatScrollPane;
 
-    @FXML private Button sendButton;
+    @FXML
+    private Button sendButton;
 
-    @FXML private Button refreshButton;
+    @FXML
+    private Button refreshButton;
 
     private static final int CHAT_PADDING = 20;
 
     public ChatViewController() {
-        this(null, null ,null);
+        this.username = null;
+        this.chatmodel = null;
+        this.controller = null;
+        this.timer = new Timer();
     }
 
     public ChatViewController(String username, ChatModel chatmodel, ChatController controller) {
@@ -44,24 +52,34 @@ public class ChatViewController {
         this.chatmodel = chatmodel;
         this.controller = controller;
         this.timer = new Timer();
+        if (this.controller != null) {
             timer.schedule(new TimerTask() {
                 @Override
                 public void run() {
                     System.err.println("tick");
-                if (controller.receiveMessage()) {
+                    if (ChatViewController.this.controller.receiveMessage()) {
                         showMessage();
                     }
                 }
             }, 0, 1000);
         }
+    }
 
     @FXML
     public void initialize() {
+        if (inputField != null) {
             inputField.setOnAction(event -> sendMessage());
+        }
+        if (sendButton != null) {
             sendButton.setOnAction(event -> sendMessage());
+        }
+        if (refreshButton != null) {
             refreshButton.setOnAction(event -> showMessage());
+        }
+        if (chatScrollPane != null && chatVBox != null) {
             chatScrollPane.vvalueProperty().bind(chatVBox.heightProperty());
         }
+    }
 
     public void showMessage() {
         while (chatmodel.count > 0) {
@@ -83,5 +101,7 @@ public class ChatViewController {
         }
     }
 
-    public void endController() { timer.cancel(); }
+    public void endController() {
+        timer.cancel();
+    }
 }

src/main/resources/ui-structure/components/Chatbox.fxml

@@ -19,7 +19,7 @@
 
 <VBox xmlns="http://javafx.com/javafx/21"
       xmlns:fx="http://javafx.com/fxml/1"
-      fx:controller="ch.unibas.dmi.dbis.cs108.casono.client.ui.chatui.ChatController"
+    fx:controller="ch.unibas.dmi.dbis.cs108.casono.client.ui.chatui.ChatViewController"
       alignment="CENTER"
       stylesheets="@Chatui.css">