的InvocationTargetException在切換場景使用JavaFX

我使用JavaFX工作，並使用.fxml文件和相關的控制器類，從現場轉移到現場，並有功能的按鈕等的InvocationTargetException在切換場景使用JavaFX

我MainMenuController涉及的菜單我正在開發一款遊戲。 MainController關心我嘗試加載的遊戲板。但每當我按下「啓動遊戲」按鈕，我得到這些錯誤：

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

對我來說，好像該MainController引起的問題和從而防止Main.fxml加載。

這裏是MainMenuController其中「launchGame」應該Main.fxml切換到新場景根法（最後}否則，如果（...）{指令）：

@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(); 
}

我控制器設置爲MainController在Main.fxml文件，所以我看不出有什麼問題：

<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">

在這裏，我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()))); 
      } 
     } 
     } 
    }); 
    } 
}

我在這個洞上工作過，仍然無法弄清楚是什麼原因導致了這個錯誤。它開始變得非常令人沮喪，如果我們能夠修復這個問題，這將是非常棒的:)

來源

2017-04-15 tripleSevenNine

第一個錯誤告訴您嘗試加載'Main.fxml'時發生問題。由於加載失敗，您有一個空根，並且您發佈的異常表明場景無法加載空根。你能添加'e1.printStackTrace（）'到catch子句'catch（Exception e1）{}'，再次運行併發布異常嗎？ –

謝謝你的快速回答！哇！我實際上可以用e1.printStackTrace（）修復這個問題，因爲它給了我一個額外的錯誤和問題的確切路線。我沒有看到與System.out.print（e1.getStackTrace（））。非常感謝你！ :) – tripleSevenNine

從閱讀您的StackTrace我看到以下行：Caused by: java.lang.NullPointerException: Root cannot be null。這意味着您不能將根設置爲空。在您的片斷有以下行之一：

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

你分配你Parent有一個空值，這導致NullPointException你得到。我建議您刪除指定給Parent的null值。

來源

2017-04-15 21:32:12 Flika205

謝謝你的快速回答！這是根保持爲空。但是這些線路需要初始化階段和根。問題是，根應該分配給FXMLLoader.load（...）。除了使用Main.fxml外，它適用於我想要切換到的每個其他場景。 – tripleSevenNine

FXMLLoader.load（getClass（）。getResource（「Main.fxml」））;返回null，但我不明白爲什麼。 – tripleSevenNine

的InvocationTargetException在切換場景使用JavaFX

回答

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