Problem się z odwołaniem do kontrolera

0

Dzień dobry, mam problem z odwołaniem się do kontrolera innej klasy. Sam analizowałem ten problem około 4h, i już na prawdę nie mam pojęcia co zrobić. Może świeże spojrzenie coś da. Konkretnie błąd odnosi się do wywołania metody mainController.setCenter();

Pozdrawiam.

Main

package pl.moja.biblioteczka;

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Scene;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.Pane;
import javafx.stage.Stage;

import java.io.IOException;
import java.util.Locale;
import java.util.ResourceBundle;

public class Main extends Application {

    public static void main(String[] args) {
        launch(args);
    }


    @Override
    public void start(Stage primaryStage) throws Exception {

/*
        Locale.setDefault(new Locale("en"));  // zmiana języka na angielski
*/
        FXMLLoader loader = new FXMLLoader(this.getClass().getResource("/fxml/BorderPaneMain.fxml"));
        ResourceBundle bundle = ResourceBundle.getBundle("bundles.mesagges");
        loader.setResources(bundle);
        BorderPane borderPane = loader.load();
        Scene scene = new Scene(borderPane);

        primaryStage.setScene(scene);
        primaryStage.setTitle(bundle.getString("title.application"));
        primaryStage.show();
    }


}

TopMenuButtonsController

package controllers;

import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.scene.control.ToggleGroup;

public class TopMenuButtonsController {
    @FXML
    private ToggleGroup toggleButtons;

    @FXML
    public void openLibrary() {
        System.out.println("openLibrary");
    }
    @FXML
    public void openListBooks() {
        System.out.println("openListBooks");

    }
    @FXML
    public void openStatistics() {
        System.out.println("openStatistics");

    }



    private MainController mainController;

    public void setMainController(MainController mainController) {

        this.mainController = mainController;
    }

    @FXML
    public void addBook() {
        if (toggleButtons.getSelectedToggle()!=null){
            toggleButtons.getSelectedToggle().setSelected(false);
        }
        mainController.setCenter();
    }
}

MainController

package controllers;

import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.layout.BorderPane;

import java.io.IOException;
import java.net.URL;
import java.util.ResourceBundle;

public class MainController {

    @FXML
    private TopMenuButtonsController topMenuButtonsController; // wstrzyknięcie kontrolera przycisków z TopMenuButtons

    @FXML
    private BorderPane borderPane;


    @FXML
    private void initialize(URL location, ResourceBundle resources){
        topMenuButtonsController.setMainController(this); // po uruchomieniu tej klasy przekazuję całą referencję do

    }

    public void setCenter()  {


        FXMLLoader loader = new FXMLLoader(this.getClass().getResource("/fxml/AddBook.fxml"));
        ResourceBundle bundle = ResourceBundle.getBundle("bundles.mesagges");
        loader.setResources(bundle);
        Parent parent = null;
        try {
            parent = loader.load();
        } catch (IOException e) {
            e.printStackTrace();
        }

        borderPane.setCenter(parent);
    }
}

Błędy

Exception in thread "JavaFX Application Thread" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
	at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1774)
	at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1657)
	at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
	at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
	at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
	at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
	at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
	at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
	at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
	at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
	at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
	at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
	at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
	at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
	at javafx.event.Event.fireEvent(Event.java:198)
	at javafx.scene.Node.fireEvent(Node.java:8411)
	at javafx.scene.control.Button.fire(Button.java:185)
	at com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:182)
	at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:96)
	at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:89)
	at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218)
	at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
	at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
	at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
	at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
	at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
	at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
	at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
	at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
	at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
	at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
	at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
	at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
	at javafx.event.Event.fireEvent(Event.java:198)
	at javafx.scene.Scene$MouseHandler.process(Scene.java:3757)
	at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3485)
	at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762)
	at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2494)
	at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:394)
	at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:295)
	at java.security.AccessController.doPrivileged(Native Method)
	at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$2(GlassViewEventHandler.java:432)
	at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:410)
	at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:431)
	at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
	at com.sun.glass.ui.View.notifyMouse(View.java:937)
	at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
	at com.sun.glass.ui.win.WinApplication.lambda$null$3(WinApplication.java:177)
	at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
	at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
	at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1771)
	... 48 more
Caused by: java.lang.NullPointerException
	at controllers.TopMenuButtonsController.addBook(TopMenuButtonsController.java:40)
	... 58 more
0

Może chociaż mała podpowiedź? Jakiś drogowskaz :) ? Nie ukrywam, że moje doświadczenie jest bardzo małe. Jakby to powiedział mój wykładowca: " za mało dupo-godzin".

0

Szanowny Panie kolego masz nulla:

Caused by: java.lang.NullPointerException
    at controllers.TopMenuButtonsController.addBook(TopMenuButtonsController.java:40)
    ... 58 more

Wynika on z faktu że instancje kontrolera TopMenuButtonsController tworzy za Ciebie JavaFX i w żadnym miejscu kodu nie tworzysz go jawnie przez operator new. W kodzie nie masz wywołania metody public void setMainController(MainController mainController). Rozwiązaniem byłoby zacząć używać obiektów kontrolera utworzonych jawnie, czyli coś takiego:

MyCustomController controller = new MyCustomController();
FXMLLoader fxmlLoader = new FXMLLoader(getClass().getResource("custom_control.fxml"));
fxmlLoader.setRoot(this);
fxmlLoader.setController(controller );

I wtedy mając dostęp do instancji kontrolera która nie jest tworzona automagicznie przez JavaFX, na nim wywołać metodę set. Ewentualnie robić po Bożemu i przekazywać zależności do kontrolera przez konstruktor.

0

Na pierwszy rzut oka spróbowałabym w ogóle utworzyć nową instancję obiektu mainController = new MainController(); - bo jak dla mnie, tu leży problem.

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