InvocationTargetException lors du passage des scènes avec JavaFX

Question

Je travaille avec JavaFX et utiliser .fxml fichiers et les classes de contrôleur associés, de se déplacer d'une scène à et ont des fonctionnalités pour les boutons etc.

Mon MainMenuController concerne les menus de un jeu que je développe. Le MainController est concerné par le plateau de jeu que j'essaye de charger. Mais chaque fois que j'appuie sur le bouton « Jeu de lancement », je reçois ces erreurs:

javafx.fxml.LoadException: 
/C:/.../bin/client/ui/Main.fxml 

cause: java.lang.NullPointerException 
where: 
/C:/.../bin/client/ui/Main.fxml 

Exception in thread "JavaFX Application Thread" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException 
at javafx.fxml.FXMLLoader$MethodHandler.invoke(Unknown Source) 
at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(Unknown Source) 
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(Unknown Source) 
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source) 
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source) 
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(Unknown Source) 
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source) 
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source) 
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source) 
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source) 
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source) 
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source) 
at com.sun.javafx.event.EventUtil.fireEventImpl(Unknown Source) 
at com.sun.javafx.event.EventUtil.fireEvent(Unknown Source) 
at javafx.event.Event.fireEvent(Unknown Source) 
at javafx.scene.Node.fireEvent(Unknown Source) 
at javafx.scene.control.Button.fire(Unknown Source) 
at com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(Unknown Source) 
at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(Unknown Source) 
at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(Unknown Source) 
at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(Unknown Source) 
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(Unknown Source) 
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source) 
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source) 
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(Unknown Source) 
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source) 
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source) 
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source) 
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source) 
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source) 
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source) 
at com.sun.javafx.event.EventUtil.fireEventImpl(Unknown Source) 
at com.sun.javafx.event.EventUtil.fireEvent(Unknown Source) 
at javafx.event.Event.fireEvent(Unknown Source) 
at javafx.scene.Scene$MouseHandler.process(Unknown Source) 
at javafx.scene.Scene$MouseHandler.access$1500(Unknown Source) 
at javafx.scene.Scene.impl_processMouseEvent(Unknown Source) 
at javafx.scene.Scene$ScenePeerListener.mouseEvent(Unknown Source) 
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(Unknown Source) 
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(Unknown Source) 
at java.security.AccessController.doPrivileged(Native Method) 
at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$354(Unknown Source) 
at com.sun.javaenter code herefx.tk.quantum.QuantumToolkit.runWithoutRenderLock(Unknown Source) 
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(Unknown Source) 
at com.sun.glass.ui.View.handleMouseEvent(Unknown Source) 
at com.sun.glass.ui.View.notifyMouse(Unknown Source) 
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method) 
at com.sun.glass.ui.win.WinApplication.lambda$null$148(Unknown Source) 
at java.lang.Thread.run(Unknown Source) 

Caused by: java.lang.reflect.InvocationTargetException 
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) 
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) 
at java.lang.reflect.Method.invoke(Unknown Source) 
at sun.reflect.misc.Trampoline.invoke(Unknown Source) 
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source) 
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) 
at java.lang.reflect.Method.invoke(Unknown Source) 
at sun.reflect.misc.MethodUtil.invoke(Unknown Source) 
... 49 more 

Caused by: java.lang.NullPointerException: Root cannot be null 
at javafx.scene.Scene.<init>(Unknown Source) 
at javafx.scene.Scene.<init>(Unknown Source) 
at client.ui.MainMenuController.handleButtonAction(MainMenuController.java:251) 
... 58 more 

Pour moi, il semble que le MainController est à l'origine du problème et donc empêcher Main.fxml à charger.

Voici la méthode de MainMenuController où "launchGame" devrait passer à une nouvelle scène avec Main.fxml en tant que root (dernière} else if (...) {instruction):

@FXML 
private void handleButtonAction(ActionEvent e) { 
Stage stage = null; 
Parent root = null; 
try { 

    if (e.getSource() == leaveBrowserButton) { 
    stage = (Stage) leaveBrowserButton.getScene().getWindow(); 
    root = FXMLLoader.load(getClass().getResource("PlayGameSelection.fxml")); 
    } 
    if (e.getSource() == connect1Button) { 
    stage = (Stage) connect1Button.getScene().getWindow(); 
    root = FXMLLoader.load(getClass().getResource("Lobby.fxml")); 
    StartUI.getClient().connect(0); 
    } 
    if (e.getSource() == connect2Button) { 
    StartUI.getClient().connect(1); 
    } 
    if (e.getSource() == connect3Button) { 
    StartUI.getClient().connect(2); 
    } 
    if (e.getSource() == playGame) { 
    stage = (Stage) playGame.getScene().getWindow(); 
    root = FXMLLoader.load(getClass().getResource("PlayGameSelection.fxml")); 
    } else if (e.getSource() == login) { 
    stage = (Stage) login.getScene().getWindow(); 
    root = FXMLLoader.load(getClass().getResource("MainMenu.fxml")); 
    } else if (e.getSource() == createProfile) { 
    stage = (Stage) createProfile.getScene().getWindow(); 
    root = FXMLLoader.load(getClass().getResource("CreateNewPlayer.fxml")); 
    } else if (e.getSource() == goToMainMenu) { 
    stage = (Stage) goToMainMenu.getScene().getWindow(); 
    root = FXMLLoader.load(getClass().getResource("MainMenu.fxml")); 
    } else if (e.getSource() == goToCreateNewPlayer) { 
    stage = (Stage) goToCreateNewPlayer.getScene().getWindow(); 
    root = FXMLLoader.load(getClass().getResource("CreateNewPlayer.fxml")); 
    } else if (e.getSource() == backToLogin) { 
    stage = (Stage) backToLogin.getScene().getWindow(); 
    root = FXMLLoader.load(getClass().getResource("Login.fxml")); 
    } else if (e.getSource() == manageProfile) { 
    stage = (Stage) manageProfile.getScene().getWindow(); 
    root = FXMLLoader.load(getClass().getResource("ManagePlayer.fxml")); 
    } else if (e.getSource() == backToGame) { 
    stage = (Stage) backToGame.getScene().getWindow(); 
    root = FXMLLoader.load(getClass().getResource("Main.fxml")); 
    } else if (e.getSource() == backToMain || e.getSource() == goBackButton) { 
    stage = (Stage) backToMain.getScene().getWindow(); 
    root = FXMLLoader.load(getClass().getResource("MainMenu.fxml")); 
    } else if (e.getSource() == playLocalGame) { 
    stage = (Stage) playLocalGame.getScene().getWindow(); 
    root = FXMLLoader.load(getClass().getResource("Browser.fxml")); 
    } else if (e.getSource() == launchGame) { 
    stage = (Stage) launchGame.getScene().getWindow(); 
    root = FXMLLoader.load(getClass().getResource("Main.fxml")); 
    StartGameMessage startGame = 
     new StartGameMessage(StartUI.getClient().getGamestate().whosTurnIsIt(), false, 0); 
    StartUI.getClient().addMessage(startGame); 
    } else { 
    stage = (Stage) playGame.getScene().getWindow(); 
    root = FXMLLoader.load(getClass().getResource(e.getClass().getName())); 
    } 
} catch (Exception e1) { 
    System.out.println(e1.getMessage()); 
    System.out.println(e1); 
    System.out.println("cause: " + e1.getCause()); 
    System.out.println("where: " + e1.getLocalizedMessage()); 
    System.out.println(e1.getStackTrace()); 
} 

Scene scene = new Scene(root); 
stage.setScene(scene); 
stage.show(); 
} 

I le contrôleur à l'MainController dans le fichier Main.fxml donc je ne vois pas de problème là-bas:

<AnchorPane fx:id="anchorPane" prefHeight="720.0" prefWidth="1200.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="client.ui.MainController"> 

Et voici mon MainController:

package client.ui; 

import java.io.IOException; 
import java.net.URL; 
import java.util.ArrayList; 
import java.util.Arrays; 
import java.util.List; 
import java.util.ResourceBundle; 

import client.domain.DevelopmentCard; 
import client.domain.NobleTile; 
import javafx.animation.PauseTransition; 
import javafx.application.Platform; 
import javafx.event.ActionEvent; 
import javafx.fxml.FXML; 
import javafx.fxml.FXMLLoader; 
import javafx.fxml.Initializable; 
import javafx.scene.Parent; 
import javafx.scene.Scene; 
import javafx.scene.control.Button; 
import javafx.scene.control.CheckBox; 
import javafx.scene.control.Label; 
import javafx.scene.control.SplitPane; 
import javafx.scene.effect.ColorAdjust; 
import javafx.scene.effect.DropShadow; 
import javafx.scene.effect.Glow; 
import javafx.scene.image.Image; 
import javafx.scene.image.ImageView; 
import javafx.scene.input.MouseEvent; 
import javafx.scene.layout.AnchorPane; 
import javafx.scene.layout.HBox; 
import javafx.scene.layout.VBox; 
import javafx.scene.text.Text; 
import javafx.stage.Stage; 
import javafx.util.Duration; 
import networkcommunication.domain.ActionTakeThreeTokens; 
import networkcommunication.domain.ActionTakeTwoTokens; 
import server.application.GameController; 

public class MainController implements Initializable, Repaintable { 

    @FXML 
    protected ImageView top1; 
    @FXML 
    protected ImageView top2; 
    @FXML 
    protected ImageView top3; 
    @FXML 
    protected ImageView top4; 
    @FXML 
    protected ImageView center1; 
    @FXML 
    protected ImageView center2; 
    @FXML 
    protected ImageView center3; 
    @FXML 
    protected ImageView center4; 
    @FXML 
    protected ImageView bottom1; 
    @FXML 
    protected ImageView bottom2; 
    @FXML 
    protected ImageView bottom3; 
    @FXML 
    protected ImageView bottom4; 
    @FXML 
    protected ImageView tokenRed7; 
    @FXML 
    protected ImageView tokenBlack7; 
    @FXML 
    protected ImageView tokenBlue7; 
    @FXML 
    protected ImageView tokenYellow5; 
    @FXML 
    protected ImageView tokenGreen7; 
    @FXML 
    protected ImageView tokenWhite7; 
    @FXML 
    protected ImageView noble1; 
    @FXML 
    protected ImageView noble2; 
    @FXML 
    protected ImageView noble3; 
    @FXML 
    protected ImageView noble4; 
    @FXML 
    protected ImageView noble5; 
    @FXML 
    protected ImageView reserve1; 
    @FXML 
    protected ImageView reserve2; 
    @FXML 
    protected ImageView reserve3; 
    @FXML 
    protected ImageView buy1; 
    @FXML 
    protected AnchorPane anchorPane; 

    @FXML 
    protected ImageView currentPosition; 

    @FXML 
    protected VBox buyBox; 
    @FXML 
    protected Button reserve; 
    @FXML 
    protected Button buy; 
    @FXML 
    protected Button goToGameMenu; 
    @FXML 
    protected Button playGame; 
    @FXML 
    protected Button playLocalGame; 
    @FXML 
    protected Button backToMain; 
    @FXML 
    protected Text counterGameYellowToken; 
    @FXML 
    protected Label yellowGameLabel; 
    @FXML 
    protected Label blackGameLabel; 
    @FXML 
    protected Label blueGameLabel; 
    @FXML 
    protected Label greenGameLabel; 
    @FXML 
    protected Label whiteGameLabel; 
    @FXML 
    protected Label redGameLabel; 
    @FXML 
    protected Label yellowOwnLabel; 
    @FXML 
    protected Label blackOwnLabel; 
    @FXML 
    protected Label blueOwnLabel; 
    @FXML 
    protected Label greenOwnLabel; 
    @FXML 
    protected Label whiteOwnLabel; 
    @FXML 
    protected Label redOwnLabel; 
    @FXML 
    protected CheckBox checkBox; 
    @FXML 
    protected ColorAdjust colorConstant = new ColorAdjust(); 
    @FXML 
    protected ImageView optionPreviewCard; 
    @FXML 
    protected HBox buyHbox; 

    private int[] counter; 
    private int[] saveInt = new int[] {0, 0, 0, 0, 0, 0}; 
    private int[] saveForThree = new int[] {0, 0, 0, 0, 0, 0}; 
    private int[] saveSpecificTokens = new int[] {0, 0, 0, 0, 0, 0}; 
    private int[] previousCounter = new int[] {0, 0, 0, 0, 0, 0}; 
    private Image forReserve; 
    protected List<ImageView> devCardsLevelO; 
    protected List<ImageView> devCardsLevelOO; 
    protected List<ImageView> devCardsLevelOOO; 
    protected List<ImageView> yellowTokens; 
    protected List<ImageView> blackTokens; 
    protected List<ImageView> redTokens; 
    protected List<ImageView> blueTokens; 
    protected List<ImageView> greenTokens; 
    protected List<ImageView> whiteTokens; 
    protected List<ImageView> nobleTilesImgV; 
    protected List<DevelopmentCard> devCards1; 
    protected List<DevelopmentCard> devCards2; 
    protected List<DevelopmentCard> devCards3; 
    protected List<NobleTile> nobleTiles; 
    private List<Label> pressableTokens = new ArrayList<>(); 
    private List<Label> ownTokens = new ArrayList<>(); 
    @FXML 
    protected Label player2view; 
    @FXML 
    protected SplitPane enemySplitPane; 
    @FXML 
    protected ImageView enemyReserve1; 
    @FXML 
    protected ImageView enemyReserve2; 
    @FXML 
    protected ImageView enemyReserve3; 
    @FXML 
    protected HBox enemyReserveBox; 

    @FXML 
    public void changeTokenCount(MouseEvent e) throws IOException { 
    pressableTokens.addAll(
     Arrays.asList(blackGameLabel, whiteGameLabel, redGameLabel, greenGameLabel, blueGameLabel)); 
    ownTokens.addAll(
     Arrays.asList(blackOwnLabel, whiteOwnLabel, redOwnLabel, greenOwnLabel, blueOwnLabel)); 
    for (int cycle = 0; cycle < pressableTokens.size(); cycle++) { 
     if (e.getSource() == pressableTokens.get(cycle) && counter[cycle] < 2) { 

     previousCounter = counter.clone(); 
     counter[cycle]++; 
     pressableTokens.get(cycle).setText("x" + Integer.toString(5 - counter[cycle])); 
     ownTokens.get(cycle).setText("x" + Integer.toString(counter[cycle])); 
     if (counter[cycle] == 2 && lastEntryPosition() == cycle) { 
      System.out.println("I just pressed x" + pressableTokens.get(cycle).getId() + " twice!"); 
     } 
     if (counter[cycle] == 2) { 
      pressableTokens.get(cycle).setDisable(true); 
     } 
     if (tookThreeDifferentTokens()) { 
      System.out.println("I just took three tokens"); 
      ActionTakeThreeTokens tookThree = new ActionTakeThreeTokens(
       StartUI.getClient().getGamestate().whosTurnIsIt(), saveSpecificTokens); 
      StartUI.getClient().addMessage(tookThree); 
      System.out.println(Arrays.toString(saveSpecificTokens)); 
      saveSpecificTokens = new int[] {0, 0, 0, 0, 0, 0}; 
     } 
     System.out.println("I just pressed: " + pressableTokens.get(cycle).getId()); 
     break; 
     } 
    } 

    for (

     int i = 0; i < 4; i++) { 
     setBrightness(devCardsLevelO.get(i), -0.2); 
     setBrightness(devCardsLevelOO.get(i), -0.2); 
     setBrightness(devCardsLevelOOO.get(i), -0.2); 
     colorConstant.setBrightness(-0.2); 

     if (devCards1.get(i).getPriceDiamond() <= counter[2] 
      && devCards1.get(i).getPriceEmerald() <= counter[4] 
      && devCards1.get(i).getPriceSapphire() <= counter[5] 
      && devCards1.get(i).getPriceRuby() <= counter[3] 
      && devCards1.get(i).getPriceOnyx() <= counter[1]) { 
     setBrightness(devCardsLevelO.get(i), 0.35); 
     } 
     if (devCards2.get(i).getPriceDiamond() <= counter[2] 
      && devCards2.get(i).getPriceEmerald() <= counter[4] 
      && devCards2.get(i).getPriceSapphire() <= counter[5] 
      && devCards2.get(i).getPriceRuby() <= counter[3] 
      && devCards2.get(i).getPriceOnyx() <= counter[1]) { 
     setBrightness(devCardsLevelOO.get(i), 0.35); 
     } 
     if (devCards3.get(i).getPriceDiamond() <= counter[2] 
      && devCards3.get(i).getPriceEmerald() <= counter[4] 
      && devCards3.get(i).getPriceSapphire() <= counter[5] 
      && devCards3.get(i).getPriceRuby() <= counter[3] 
      && devCards3.get(i).getPriceOnyx() <= counter[1]) { 
     setBrightness(devCardsLevelOOO.get(i), 0.35); 
     } 
    } 
    System.out.println("counter: " + Arrays.toString(counter) + "\tpreviousCounter: " 
     + Arrays.toString(previousCounter) + "\tsaveThree: " + Arrays.toString(saveForThree) 
     + "\tYou took those different tokens: " + Arrays.toString(saveSpecificTokens)); 
    System.out.println(""); 
    } 

    @FXML 
    public void manageCardClick(MouseEvent e) throws IOException { 
    if (e.getSource() == reserve) { 
     setReserveImage(forReserve); 
     buyBox.setVisible(false); 
     counter[0]++; 
     yellowGameLabel.setText("x" + Integer.toString(4 - counter[0])); 
     yellowOwnLabel.setText("x" + Integer.toString(counter[0])); 
    } else if (e.getSource() == buy) { 
     setBuyImage(forReserve); 
     buyBox.setVisible(false); 
     blackGameLabel 
      .setText("x" + Integer.toString(5 - counter[1] + devCards1.get(1).getPriceOnyx())); 
     blackOwnLabel.setText("x" + Integer.toString(counter[1] - devCards1.get(1).getPriceOnyx())); 
     redGameLabel 
      .setText("x" + Integer.toString(5 - counter[3] + devCards1.get(1).getPriceRuby())); 
     redOwnLabel.setText("x" + Integer.toString(counter[3] - devCards1.get(1).getPriceRuby())); 
     blueGameLabel 
      .setText("x" + Integer.toString(5 - counter[5] + devCards1.get(1).getPriceSapphire())); 
     blueOwnLabel 
      .setText("x" + Integer.toString(counter[5] - devCards1.get(1).getPriceSapphire())); 
     greenGameLabel 
      .setText("x" + Integer.toString(5 - counter[4] + devCards1.get(1).getPriceEmerald())); 
     greenOwnLabel 
      .setText("x" + Integer.toString(counter[4] - devCards1.get(1).getPriceEmerald())); 
     whiteGameLabel 
      .setText("x" + Integer.toString(5 - counter[2] + devCards1.get(1).getPriceDiamond())); 
     whiteOwnLabel 
      .setText("x" + Integer.toString(counter[2] + devCards1.get(1).getPriceDiamond())); 
    } 
    } 

    private int lastEntryPosition() { 
    int out = -1; 
    for (int i = 0; i < counter.length; i++) { 
     if (counter[i] - previousCounter[i] != 0) { 
     out = i; 
     break; 
     } 
    } 
    System.out.println("Position: " + out); 
    return out; 
    } 

    private boolean tookThreeDifferentTokens() { 
    int countToThree = 0; 
    for (int i = 0; i < counter.length; i++) { 
     if (counter[i] - saveForThree[i] != 0) { 
     countToThree++; 
     } 
    } 
    System.out.println(countToThree); 
    if (countToThree == 3) { 
     for (int j = 0; j < counter.length; j++) { 
     saveSpecificTokens[j] = counter[j] - saveForThree[j]; 
     } 
     saveForThree = counter.clone(); 
     return true; 
    } else { 
     return false; 
    } 
    } 

    @FXML 
    protected void handleButtonAction(ActionEvent e) throws IOException { 
    Stage stage; 

    Parent root; 

    if (e.getSource() == goToGameMenu) { 
     stage = (Stage) goToGameMenu.getScene().getWindow(); 
     root = FXMLLoader.load(getClass().getResource("GameMenu.fxml")); 
    } else { 
     stage = (Stage) playGame.getScene().getWindow(); 
     root = FXMLLoader.load(getClass().getResource("Main.fxml")); 
    } 

    Scene scene = new Scene(root); 
    stage.setScene(scene); 
    stage.show(); 

    } 

    public void hideImgView(ImageView imgV) { 
    imgV.setVisible(false); 
    } 

    public void selectDevCard(ImageView imgV) { 
    if (imgV.getScaleX() == 1.0) { 
     imgV.setEffect(new Glow(0.7)); 
     imgV.setScaleX(1.15); 
     imgV.setScaleY(1.15); 
    } else { 
     DropShadow shadow = new DropShadow(); 
     imgV.setEffect(shadow); 
     imgV.setScaleX(1.0); 
     imgV.setScaleY(1.0); 
    } 
    } 

    public void setReserveImage(Image im) throws IOException { 
    if (reserve1.getImage() == null) { 
     reserve1.setImage(im); 
     setNewCard(); 
    } else if (reserve2.getImage() == null) { 
     reserve2.setImage(im); 
     setNewCard(); 
    } else if (reserve3.getImage() == null) { 
     reserve3.setImage(im); 
     setNewCard(); 

    } else { 
     Stage warning = new Stage(); 
     Parent root = FXMLLoader.load(getClass().getResource("Warning.fxml")); 
     Scene warningScene = new Scene(root); 
     warning.setScene(warningScene); 
     warning.show(); 
     PauseTransition delay = new PauseTransition(Duration.seconds(5)); 
     delay.setOnFinished(e -> warning.close()); 
     delay.play(); 
    } 

    } 

    public void setBuyImage(Image im) { 
    ImageView buyView = new ImageView(optionPreviewCard.getImage()); 
    buyView.fitHeightProperty().bind(buyHbox.heightProperty()); 
    buyView.setPreserveRatio(true); 
    buyHbox.getChildren().add(buyView); 
    setNewCard(); 
    } 

    public void setImageEffect(ImageView imageView, double brightness) { 
    ColorAdjust colorAdjust = new ColorAdjust(); 
    colorAdjust.setBrightness(brightness); 
    imageView.addEventFilter(MouseEvent.MOUSE_ENTERED, e -> imageView.setEffect(colorAdjust)); 
    imageView.addEventFilter(MouseEvent.MOUSE_EXITED, e -> imageView.setEffect(colorConstant)); 
    } 

    public void setBrightness(ImageView imageView, double brightness) { 
    ColorAdjust colorAdjust = new ColorAdjust(); 
    colorAdjust.setBrightness(brightness); 
    imageView.setEffect(colorAdjust); 
    } 

    private void setNewCard() { 
    for (int i = 0; i < 4; i++) { 
     if (devCardsLevelO.get(i).getImage() == null) { 
     devCardsLevelO.get(i) 
      .setImage(new Image(this.getClass().getResourceAsStream(devCards1.get(4).getPath()))); 
     } 
     if (devCardsLevelOO.get(i).getImage() == null) { 
     devCardsLevelOO.get(i) 
      .setImage(new Image(this.getClass().getResourceAsStream(devCards2.get(4).getPath()))); 
     } 
     if (devCardsLevelOOO.get(i).getImage() == null) { 
     devCardsLevelOOO.get(i) 
      .setImage(new Image(this.getClass().getResourceAsStream(devCards3.get(4).getPath()))); 
     } 
    } 
    } 

    @Override 
    public void initialize(URL location, ResourceBundle resources) { 
    StartUI.getRepaintThread().addInterface(this); 
    this.counter = new int[6]; 
    this.saveInt = new int[6]; 
    for (int i = 0; i < this.counter.length; i++) { 
     this.counter[i] = 0; 
     this.saveInt[i] = 0; 
    } 

    this.devCardsLevelO = new ArrayList<ImageView>(); 
    this.devCardsLevelOO = new ArrayList<ImageView>(); 
    this.devCardsLevelOOO = new ArrayList<ImageView>(); 
    this.yellowTokens = new ArrayList<ImageView>(); 
    this.blackTokens = new ArrayList<ImageView>(); 
    redTokens = new ArrayList<ImageView>(); 
    this.blueTokens = new ArrayList<ImageView>(); 
    this.greenTokens = new ArrayList<ImageView>(); 
    this.whiteTokens = new ArrayList<ImageView>(); 
    this.nobleTilesImgV = new ArrayList<ImageView>(); 

    this.devCards1 = new ArrayList<DevelopmentCard>(); 
    this.devCards2 = new ArrayList<DevelopmentCard>(); 
    this.devCards3 = new ArrayList<DevelopmentCard>(); 
    this.nobleTiles = new ArrayList<NobleTile>(); 

    this.devCardsLevelO.addAll(Arrays.asList(bottom1, bottom2, bottom3, bottom4)); 
    this.devCardsLevelOO.addAll(Arrays.asList(center1, center2, center3, center4)); 
    this.devCardsLevelOOO.addAll(Arrays.asList(top1, top2, top3, top4)); 
    this.nobleTilesImgV.addAll(Arrays.asList(noble1, noble2, noble3, noble4, noble5)); 


    for (int i = 0; i < devCardsLevelO.size(); i++) { 
     int k = i; 
     setImageEffect(devCardsLevelO.get(k), 0.2); 

     devCardsLevelO.get(i).setSmooth(true); 
     devCardsLevelO.get(i).setOnMouseClicked(e -> { 
     forReserve = devCardsLevelO.get(k).getImage(); 
     optionPreviewCard.setImage(forReserve); 
     buyBox.setVisible(true); 
     devCards1.get(k).setSelectable(false); 
     devCardsLevelO.get(k).setImage(null); 
     }); 

     setImageEffect(devCardsLevelOO.get(k), 0.2); 
     devCardsLevelOO.get(k).setOnMouseClicked(e -> { 
     buyBox.setVisible(true); 
     forReserve = devCardsLevelOO.get(k).getImage(); 
     optionPreviewCard.setImage(forReserve); 
     devCards2.get(k).setSelectable(false); 
     devCardsLevelOO.get(k).setImage(null); 
     }); 

     setImageEffect(devCardsLevelOOO.get(k), 0.2); 
     devCardsLevelOOO.get(k).setOnMouseClicked(e -> { 
     buyBox.setVisible(true); 
     forReserve = devCardsLevelOOO.get(k).getImage(); 
     optionPreviewCard.setImage(forReserve); 
     devCards3.get(k).setSelectable(false); 
     devCardsLevelOOO.get(k).setImage(null); 
     }); 
    } 

    } 

    @Override 
    public void update() { 
    Platform.runLater(new Runnable() { 
     @Override 
     public void run() { 
     devCards1 = StartUI.getClient().getGamestate().getDevelopmentCardsLevelO(); 
     devCards2 = StartUI.getClient().getGamestate().getDevelopmentCardsLevelOO(); 
     devCards3 = StartUI.getClient().getGamestate().getDevelopmentCardsLevelOOO(); 
     nobleTiles = StartUI.getClient().getGamestate().getNobleTiles(); 
     for (int i = 0; i < nobleTilesImgV.size(); i++) { 
      if (nobleTiles.get(i).isSelectable()) { 
      nobleTilesImgV.get(i).setImage(
       new Image(this.getClass().getResourceAsStream(nobleTiles.get(i).getPath()))); 
      } 
     } 
     for (int i = 0; i < devCardsLevelO.size(); i++) { 
      if (devCards1.get(i).isSelectable()) { 
      devCardsLevelO.get(i).setImage(
       new Image(this.getClass().getResourceAsStream(devCards1.get(i).getPath()))); 
      } 
     } 
     for (int i = 0; i < devCardsLevelOO.size(); i++) { 
      if (devCards2.get(i).isSelectable()) { 
      devCardsLevelOO.get(i).setImage(
       new Image(this.getClass().getResourceAsStream(devCards2.get(i).getPath()))); 
      } 
     } 
     for (int i = 0; i < devCardsLevelOOO.size(); i++) { 
      if (devCards3.get(i).isSelectable()) { 
      devCardsLevelOOO.get(i).setImage(
       new Image(this.getClass().getResourceAsStream(devCards3.get(i).getPath()))); 
      } 
     } 
     } 
    }); 
    } 
} 

J'ai travaillé le jour du trou dessus et je n'arrivais toujours pas à comprendre ce qui causait cette erreur. Il commence à devenir très frustrant et ce serait génial si nous pouvions résoudre ce problème :)

Answer 1

depuis la lecture de votre StackTrace Je vois la ligne suivante: Caused by: java.lang.NullPointerException: Root cannot be null. Cela signifie que vous ne pouvez pas définir la racine sur null. Dans l'un de vos extraits que vous avez les lignes suivantes:

@FXML private void handleButtonAction(ActionEvent e) { Stage stage = null; Parent root = null;

Vous vous assignez Parent d'avoir une valeur nulle, qui cause la NullPointException que vous obtenez. Je vous suggère de supprimer la valeur null que vous affectez au Parent.