JavaFX：未在自定义组件上调用initialize（）方法(JavaFX: initialize() method not being called on custom component)

 我正在尝试使用FXML标记创建自己的自定义JavaFX组件以及扩展HBox的控制器。 无论出于何种原因，都没有调用initialize（）方法（我看不到调试输出）。 这仅适用于我的自定义组件，我的所有其他控制器都按预期运行，并且始终在初始化。 我不知道出了什么问题 - 这是我的代码。 
 
 NotificationItem.fxml（标记） 
 
<fx:root type="javafx.scene.layout.HBox" xmlns:fx="http://javafx.com/fxml" spacing="5">
  <ImageView fx:id="image" preserveRatio="true" fitWidth="60" />
  <VBox alignment="center">
    <Text text="notification" />
    <Label fx:id="title" />
    <Label fx:id="content" />
    <Label fx:id="timestamp" />
  </VBox>
</fx:root>
 
 NotificationItem.java（控制器） 
 
public class NotificationItem extends HBox {
    public static final String FXML_FILENAME = "NotificationItem.fxml";

    @FXML private ResourceBundle resources;  
    @FXML private ImageView image;
    @FXML private Label title;
    @FXML private Label content;
    @FXML private Label timestamp;

    private Notification notification; 
    private AbstractModel associatedModel;

    public NotificationItem(Notification notification) {
        this.notification = notification;
        this.associatedModel = notification.getAssociatedModel();

        FXMLHelper.loadFxml("/com/github/norbo11/topbuilders/fxml/" + FXML_FILENAME, this, this);
    }

    @FXML
    public void initialize() {      
        System.out.println(notification.getType());

        switch (notification.getType()) {
            case ASSIGNMENT_CLOSE_TO_END:
                break;
            case EMPLOYEE_ASSIGNMENT_COMPLETE:
                break;
            case NEW_ASSIGNMENT:
                break;
            case NEW_MESSAGE:
                Message message = (Message) associatedModel;
                title.setText(resources.getString("home.notifications.new_message"));
                content.setText(resources.getString("messages.sender") + ": " + message.getSender());
                break;
            case NEW_QUOTE_REQUEST:
                break;
        }

        timestamp.setText(Util.formatDate(notification.getDate()));
    }
}
 
 用于加载FXML的过程（忽略返回值，在这种情况下不使用） 
 
public static LoadedFXML loadFxml(String filename, Object root, Object controller) {
        Log.info("Loading FXML: " + filename);
        Parent loadedRoot = null;
        AbstractController loadedController = null;

        try {
            FXMLLoader loader = new FXMLLoader(Main.getApp().getClass().getResource(filename));
            if (root != null) loader.setRoot(root);
            if (controller != null) loader.setController(controller);

            if (!filename.equals(LoginScene.getAbsoluteFxmlFilename())) {
                Employee user = Employee.getCurrentEmployee();

                //If the user is logged in
                if (user != null) {
                    Locale locale = Employee.getCurrentEmployee().getSettings().getLocale();
                    loader.setResources(ResourceBundle.getBundle("lang.lang", locale, ClassLoader.getSystemClassLoader()));
                }
            }

            if (root == null) loadedRoot = loader.load();
            if (controller == null) loadedController = loader.getController();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return new LoadedFXML(loadedRoot, loadedController);
    }

I am trying to create my own custom JavaFX component using FXML markup as well as a controller which extends HBox. For whatever reason, the initialize() method is simply not being called (I can see no debug output). This only occurs for my custom component, all my other controllers behave as expected and are always being initialized. I have no clue what is wrong - here is my code.
 
NotificationItem.fxml (markup)
 
<fx:root type="javafx.scene.layout.HBox" xmlns:fx="http://javafx.com/fxml" spacing="5">
  <ImageView fx:id="image" preserveRatio="true" fitWidth="60" />
  <VBox alignment="center">
    <Text text="notification" />
    <Label fx:id="title" />
    <Label fx:id="content" />
    <Label fx:id="timestamp" />
  </VBox>
</fx:root>
 
NotificationItem.java (controller)
 
public class NotificationItem extends HBox {
    public static final String FXML_FILENAME = "NotificationItem.fxml";

    @FXML private ResourceBundle resources;  
    @FXML private ImageView image;
    @FXML private Label title;
    @FXML private Label content;
    @FXML private Label timestamp;

    private Notification notification; 
    private AbstractModel associatedModel;

    public NotificationItem(Notification notification) {
        this.notification = notification;
        this.associatedModel = notification.getAssociatedModel();

        FXMLHelper.loadFxml("/com/github/norbo11/topbuilders/fxml/" + FXML_FILENAME, this, this);
    }

    @FXML
    public void initialize() {      
        System.out.println(notification.getType());

        switch (notification.getType()) {
            case ASSIGNMENT_CLOSE_TO_END:
                break;
            case EMPLOYEE_ASSIGNMENT_COMPLETE:
                break;
            case NEW_ASSIGNMENT:
                break;
            case NEW_MESSAGE:
                Message message = (Message) associatedModel;
                title.setText(resources.getString("home.notifications.new_message"));
                content.setText(resources.getString("messages.sender") + ": " + message.getSender());
                break;
            case NEW_QUOTE_REQUEST:
                break;
        }

        timestamp.setText(Util.formatDate(notification.getDate()));
    }
}
 
Procedure used to load my FXML (ignore the return value, that isn't used in this case)
 
public static LoadedFXML loadFxml(String filename, Object root, Object controller) {
        Log.info("Loading FXML: " + filename);
        Parent loadedRoot = null;
        AbstractController loadedController = null;

        try {
            FXMLLoader loader = new FXMLLoader(Main.getApp().getClass().getResource(filename));
            if (root != null) loader.setRoot(root);
            if (controller != null) loader.setController(controller);

            if (!filename.equals(LoginScene.getAbsoluteFxmlFilename())) {
                Employee user = Employee.getCurrentEmployee();

                //If the user is logged in
                if (user != null) {
                    Locale locale = Employee.getCurrentEmployee().getSettings().getLocale();
                    loader.setResources(ResourceBundle.getBundle("lang.lang", locale, ClassLoader.getSystemClassLoader()));
                }
            }

            if (root == null) loadedRoot = loader.load();
            if (controller == null) loadedController = loader.getController();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return new LoadedFXML(loadedRoot, loadedController);
    }

原文：https://stackoverflow.com/questions/27806953