Improve code quality (again)

pom.xml

@@ -99,7 +99,18 @@
       <artifactId>smack-java8</artifactId>
       <version>4.4.7</version>
     </dependency>
-      <dependency>
+    <!-- https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-core -->
+    <dependency>
+      <groupId>org.apache.logging.log4j</groupId>
+      <artifactId>log4j-core</artifactId>
+      <version>2.23.1</version>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.logging.log4j</groupId>
+      <artifactId>log4j-api</artifactId>
+      <version>2.23.1</version>
+    </dependency>
+    <dependency>
           <groupId>org.jetbrains</groupId>
           <artifactId>annotations</artifactId>
           <version>24.1.0</version>

src/main/java/module-info.java

@@ -14,6 +14,7 @@
     requires smack.tcp;
     requires smack.core;
     requires org.jetbrains.annotations;
+    requires org.apache.logging.log4j;
 
     opens team.elrant.bubbles.gui to javafx.fxml;
     exports team.elrant.bubbles.gui;

src/main/java/team/elrant/bubbles/gui/ChatViewApplication.java

@@ -5,20 +5,26 @@
 import javafx.scene.Scene;
 import javafx.scene.layout.AnchorPane;
 import javafx.stage.Stage;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+import org.jetbrains.annotations.NotNull;
 import team.elrant.bubbles.xmpp.ConnectedUser;
 
 /**
  * The ChatViewApplication class is responsible for launching the chat application GUI.
  * It initializes the primary stage with the ChatView.fxml layout and sets up the ChatViewController.
  */
 public class ChatViewApplication extends Application {
+    private static final Logger logger = LogManager.getLogger(ChatViewApplication.class);
+
     private final ConnectedUser connectedUser;
     private final String contactJid;
 
     /**
      * Constructs a ChatViewApplication with the specified connected user and contact JID.
+     *
      * @param connectedUser The connected user object.
-     * @param contactJid The JID of the contact to chat with.
+     * @param contactJid    The JID of the contact to chat with.
      */
     public ChatViewApplication(ConnectedUser connectedUser, String contactJid) {
         this.connectedUser = connectedUser;
@@ -28,36 +34,43 @@ public ChatViewApplication(ConnectedUser connectedUser, String contactJid) {
     /**
      * The start method initializes the primary stage of the chat application.
      * It loads the ChatView.fxml layout, sets up the ChatViewController, and displays the stage.
+     *
      * @param primaryStage The primary stage of the application.
      * @throws Exception If an error occurs during the initialization.
      */
     @Override
-    public void start(Stage primaryStage) throws Exception {
-        FXMLLoader fxmlLoader = new FXMLLoader(getClass().getResource("ChatView.fxml"));
+    public void start(@NotNull Stage primaryStage) throws Exception {
+        try {
+            @NotNull FXMLLoader fxmlLoader = new FXMLLoader(getClass().getResource("ChatView.fxml"));
 
-        // Set custom controller factory
-        fxmlLoader.setControllerFactory(param -> {
-            try {
-                // Instantiate the controller with the required properties
-                return new ChatViewController(connectedUser, contactJid);
-            } catch (Exception e) {
-                e.printStackTrace();
-                throw new RuntimeException(e);
-            }
-        });
+            // Set custom controller factory
+            fxmlLoader.setControllerFactory(param -> {
+                try {
+                    // Instantiate the controller with the required properties
+                    return new ChatViewController(connectedUser, contactJid);
+                } catch (Exception e) {
+                    logger.error("Error creating ChatViewController: " + e.getMessage());
+                    throw new RuntimeException(e);
+                }
+            });
 
-        AnchorPane root = fxmlLoader.load();
-        Scene scene = new Scene(root, 400, 800);
+            AnchorPane root = fxmlLoader.load();
+            @NotNull Scene scene = new Scene(root, 400, 800);
 
-        primaryStage.setTitle("Chat");
-        primaryStage.setScene(scene);
-        primaryStage.centerOnScreen();
-        primaryStage.setResizable(false);
-        primaryStage.show();
+            primaryStage.setTitle("Chat");
+            primaryStage.setScene(scene);
+            primaryStage.centerOnScreen();
+            primaryStage.setResizable(false);
+            primaryStage.show();
+        } catch (Exception e) {
+            logger.error("Error starting ChatViewApplication: " + e.getMessage());
+            throw e;
+        }
     }
 
     /**
      * The main method launches the JavaFX application.
+     *
      * @param args The command-line arguments.
      */
     public static void main(String[] args) {