JavaFX: Exception in thread "JavaFX Anwendung Thread" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException

Ich arbeite an JavaFX Projekt und ich habe einen Fehler wie folgt aus:JavaFX: Exception in thread "JavaFX Anwendung Thread" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException

Logout 
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.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:8413) 
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.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$MouseEventNotification.run(GlassViewEventHandler.java:380) 
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:294) 
at java.security.AccessController.doPrivileged(Native Method) 
at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$354(GlassViewEventHandler.java:416) 
at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389) 
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:415) 
at com.sun.glass.ui.View.handleMouseEvent(View.java:555) 
at com.sun.glass.ui.View.notifyMouse(View.java:937) 
at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method) 
at com.sun.glass.ui.gtk.GtkApplication.lambda$null$49(GtkApplication.java:139) 
at java.lang.Thread.run(Thread.java:745) 
Caused by: java.lang.reflect.InvocationTargetException 
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
at java.lang.reflect.Method.invoke(Method.java:498) 
at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71) 
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source) 
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
at java.lang.reflect.Method.invoke(Method.java:498) 
at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275) 
at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1771) 
... 52 more 
Caused by: java.lang.NullPointerException 
at gn.kahere.car.manager.view.DrawerContentController.logoutAction(DrawerContentController.java:56) 
... 62 more

Meine MainApp.java

package gn.kahere.car.manager; 

import java.io.IOException; 

import gn.kahere.car.manager.view.DrawerContentController; 
import gn.kahere.car.manager.view.LoginController; 
import gn.kahere.car.manager.view.RootLayoutController; 
import javafx.application.Application; 
import javafx.fxml.FXMLLoader; 
import javafx.scene.Scene; 
import javafx.scene.layout.AnchorPane; 
import javafx.stage.Stage; 

public class MainApp extends Application { 

    private Stage primaryStage; 
    private AnchorPane rootLayout; 

    @Override 
    public void start(Stage primaryStage) { 
     this.primaryStage = primaryStage; 
     this.primaryStage.setTitle("Car Manager"); 

     // Prevent the window resizing 
     this.primaryStage.setResizable(false); 

     showLogin(); 
    } 

    /** 
    * Show the login page 
    */ 
    public void showLogin() { 
     try { 
      // Load login page 
      FXMLLoader loader = new FXMLLoader(); 
      loader.setLocation(MainApp.class.getResource("view/Login.fxml")); 
      AnchorPane login = (AnchorPane) loader.load(); 

      // Set the scene containing the login page 
      Scene scene = new Scene(login); 
      primaryStage.setScene(scene); 

      // Give the controller access to the main application 
      LoginController controller = loader.getController(); 
      controller.setMainApp(this); 

      // Show the scene 
      primaryStage.show(); 
     } catch(IOException e) { 
      e.printStackTrace(); 
     } 
    } 

    /** 
    * Initializes the root layout 
    */ 
    public void initRootLayout() { 
     try { 
      // Load root layout 
      FXMLLoader loader = new FXMLLoader(); 
      loader.setLocation(MainApp.class.getResource("view/RootLayout.fxml")); 
      rootLayout = (AnchorPane) loader.load(); 

      // Give the controller access to the main application 
      RootLayoutController controller = loader.getController(); 
      controller.setMainApp(this); 

      // Get the DrawerContentController 
      FXMLLoader drawerLoader = new FXMLLoader(); 
      drawerLoader.setLocation(MainApp.class.getResource("view/DrawerContent.fxml")); 
      drawerLoader.load(); // Load the fxml file 
      DrawerContentController drawerController = drawerLoader.getController(); 
      drawerController.setMainApp(this); 

      // Show the scene containing the root layout 
      Scene scene = new Scene(rootLayout); 
      primaryStage.setScene(scene); 
      primaryStage.show(); 
     } catch(IOException e) { 
      e.printStackTrace(); 
     } 
    } 

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

Mein RootLayoutController.java

package gn.kahere.car.manager.view; 

import java.io.IOException; 

import com.jfoenix.controls.JFXDrawer; 
import com.jfoenix.controls.JFXHamburger; 
import com.jfoenix.transitions.hamburger.HamburgerBasicCloseTransition; 

import gn.kahere.car.manager.MainApp; 
import javafx.fxml.FXML; 
import javafx.fxml.FXMLLoader; 
import javafx.scene.input.MouseEvent; 
import javafx.scene.layout.VBox; 

public class RootLayoutController { 

    // Reference to the main application 
    @SuppressWarnings("unused") 
    private MainApp mainApp; 

    @FXML 
    private JFXHamburger hamburger; 

    @FXML 
    private JFXDrawer drawer; 


    /** 
    * Controller 
    */ 
    public RootLayoutController() { 

    } 

    /** 
    * Initializes the controller class. 
    */ 
    @FXML 
    private void initialize() { 
     try { 
      VBox box = FXMLLoader.load(getClass().getResource("DrawerContent.fxml")); 
      drawer.setSidePane(box); 

      HamburgerBasicCloseTransition burgerTask = new HamburgerBasicCloseTransition(hamburger); 
      burgerTask.setRate(-1); 

      hamburger.addEventHandler(MouseEvent.MOUSE_PRESSED, (e) -> { 
       burgerTask.setRate(burgerTask.getRate() * -1); 
       burgerTask.play(); 

       if(drawer.isShown()) 
        drawer.close(); 
       else 
        drawer.open(); 
      }); 
     } catch(IOException e) { 
      e.printStackTrace(); 
     } 
    } 

    /** 
    * Is called by the main application to give a reference back to itself 
    * 
    * @param mainApp 
    */ 
    public void setMainApp(MainApp mainApp) { 
     this.mainApp = mainApp; 
    } 

}

RootLayout.fxml

<?xml version="1.0" encoding="UTF-8"?> 

<?import com.jfoenix.controls.JFXDrawer?> 
<?import com.jfoenix.controls.JFXHamburger?> 
<?import javafx.scene.Cursor?> 
<?import javafx.scene.effect.DropShadow?> 
<?import javafx.scene.layout.AnchorPane?> 

<AnchorPane prefHeight="700.0" prefWidth="1000.0" stylesheets="@style.css" xmlns="http://javafx.com/javafx/8.0.111" xmlns:fx="http://javafx.com/fxml/1" fx:controller="gn.kahere.car.manager.view.RootLayoutController"> 
    <children> 
     <JFXHamburger fx:id="hamburger" layoutX="946.0" layoutY="24.0" stylesheets="@style.css" AnchorPane.rightAnchor="20.0" AnchorPane.topAnchor="20.0"> 
     <cursor> 
      <Cursor fx:constant="HAND" /> 
     </cursor> 
     </JFXHamburger> 
     <JFXDrawer fx:id="drawer" defaultDrawerSize="200.0" prefHeight="700.0" prefWidth="200.0" stylesheets="@../../../../../../bin/gn/kahere/car/manager/view/style.css" AnchorPane.bottomAnchor="0.0" AnchorPane.topAnchor="0.0"> 
     <effect> 
      <DropShadow /> 
     </effect> 
     </JFXDrawer> 
    </children> 
</AnchorPane>

DrawerContentController.java

package gn.kahere.car.manager.view; 

import gn.kahere.car.manager.MainApp; 
import javafx.fxml.FXML; 

public class DrawerContentController { 

    // Reference to the main application 
    private MainApp mainApp; 


    /** 
    * Controller 
    */ 
    public DrawerContentController() { 

    } 

    @FXML 
    private void initialize() { 
     System.out.println("Drawer"); 
    } 

    @FXML 
    private void homeAction() { 
     System.out.println("Home"); 
    } 

    @FXML 
    private void addCarAction() { 
     System.out.println("Add Car"); 
    } 

    @FXML 
    private void listCarsAction() { 
     System.out.println("List Cars"); 
    } 

    @FXML 
    private void searchAction() { 
     System.out.println("Search"); 
    } 

    @FXML 
    private void agentsAction() { 
     System.out.println("Agents"); 
    } 

    @FXML 
    private void profileAction() { 
     System.out.println("Profile"); 
    } 

    @FXML 
    private void logoutAction() { 
     System.out.println("Logout"); 
     mainApp.showLogin(); 
    } 

    /** 
    * Is called by the main application to give a reference back to itself 
    * 
    * @param mainApp 
    */ 
    public void setMainApp(MainApp mainApp) { 
     this.mainApp = mainApp; 
    } 

}

DrawerContent.fxml

<?xml version="1.0" encoding="UTF-8"?> 

<?import com.jfoenix.controls.JFXButton?> 
<?import java.lang.String?> 
<?import javafx.scene.control.Separator?> 
<?import javafx.scene.image.Image?> 
<?import javafx.scene.image.ImageView?> 
<?import javafx.scene.layout.Pane?> 
<?import javafx.scene.layout.VBox?> 
<?import javafx.scene.text.Font?> 
<?import javafx.scene.text.Text?> 
<?import javafx.scene.text.TextFlow?> 

<VBox maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="700.0" prefWidth="200.0" stylesheets="@style.css" xmlns="http://javafx.com/javafx/8.0.111" xmlns:fx="http://javafx.com/fxml/1" fx:controller="gn.kahere.car.manager.view.DrawerContentController"> 
    <children> 
     <Pane prefHeight="150.0" prefWidth="200.0" styleClass="side-menu-header" stylesheets="@style.css"> 
     <children> 
      <Text fill="WHITE" layoutX="14.0" layoutY="131.0" strokeType="OUTSIDE" strokeWidth="0.0" text="MAMADOU ALIOU DIALLO"> 
       <font> 
        <Font size="12.0" /> 
       </font> 
      </Text> 
      <ImageView fitHeight="62.0" fitWidth="66.0" layoutX="14.0" layoutY="44.0" pickOnBounds="true" preserveRatio="true"> 
       <image> 
        <Image url="@../../../../../../img/user/avatar.png" /> 
       </image> 
      </ImageView> 
     </children> 
     </Pane> 
     <TextFlow prefHeight="18.0" prefWidth="200.0" style="-fx-background-color: #f0f8ff;" styleClass="navigation" stylesheets="@style.css"> 
     <children> 
      <Text strokeType="OUTSIDE" strokeWidth="0.0" text="PRINCIPAL NAVIGATION" wrappingWidth="176.49267578125" /> 
     </children> 
     </TextFlow> 
     <JFXButton buttonType="RAISED" onAction="#homeAction" prefHeight="50.0" prefWidth="199.0" style="-fx-background-color: #ff033e;" stylesheets="@style.css" text="HOME" textFill="WHITE"> 
     <font> 
      <Font size="16.0" /> 
     </font> 
     <styleClass> 
      <String fx:value="menu-btn" /> 
      <String fx:value="btn" /> 
     </styleClass> 
     </JFXButton> 
     <Separator prefWidth="200.0" /> 
     <JFXButton buttonType="RAISED" onAction="#addCarAction" prefHeight="50.0" prefWidth="199.0" style="-fx-background-color: #ff033e;" stylesheets="@style.css" text="ADD CAR" textFill="WHITE"> 
     <font> 
      <Font size="16.0" /> 
     </font> 
     <styleClass> 
      <String fx:value="menu-btn" /> 
      <String fx:value="btn" /> 
     </styleClass> 
     </JFXButton> 
     <Separator prefWidth="200.0" /> 
     <JFXButton buttonType="RAISED" layoutX="10.0" layoutY="196.0" onAction="#listCarsAction" prefHeight="50.0" prefWidth="199.0" style="-fx-background-color: #ff033e;" stylesheets="@style.css" text="LIST CARS" textFill="WHITE"> 
     <font> 
      <Font size="16.0" /> 
     </font> 
     <styleClass> 
      <String fx:value="menu-btn" /> 
      <String fx:value="btn" /> 
     </styleClass> 
     </JFXButton> 
     <Separator prefWidth="200.0" /> 
     <JFXButton buttonType="RAISED" layoutX="10.0" layoutY="196.0" onAction="#searchAction" prefHeight="50.0" prefWidth="199.0" style="-fx-background-color: #ff033e;" stylesheets="@style.css" text="SEARCH" textFill="WHITE"> 
     <font> 
      <Font size="16.0" /> 
     </font> 
     <styleClass> 
      <String fx:value="menu-btn" /> 
      <String fx:value="btn" /> 
     </styleClass> 
     </JFXButton> 
     <TextFlow layoutX="10.0" layoutY="160.0" prefHeight="18.0" prefWidth="200.0" style="-fx-background-color: #f0f8ff;" styleClass="navigation" stylesheets="@style.css"> 
     <children> 
      <Text strokeType="OUTSIDE" strokeWidth="0.0" text="MANAGER" wrappingWidth="176.49267578125" /> 
     </children> 
     </TextFlow> 
     <JFXButton buttonType="RAISED" layoutX="10.0" layoutY="196.0" onAction="#agentsAction" prefHeight="50.0" prefWidth="199.0" style="-fx-background-color: #ff033e;" stylesheets="@style.css" text="AGENTS" textFill="WHITE"> 
     <font> 
      <Font size="16.0" /> 
     </font> 
     <styleClass> 
      <String fx:value="menu-btn" /> 
      <String fx:value="btn" /> 
     </styleClass> 
     </JFXButton> 
     <Separator prefWidth="200.0" /> 
     <JFXButton buttonType="RAISED" layoutX="10.0" layoutY="408.0" onAction="#profileAction" prefHeight="50.0" prefWidth="199.0" style="-fx-background-color: #ff033e;" stylesheets="@style.css" text="PROFILE" textFill="WHITE"> 
     <font> 
      <Font size="16.0" /> 
     </font> 
     <styleClass> 
      <String fx:value="menu-btn" /> 
      <String fx:value="btn" /> 
     </styleClass> 
     </JFXButton> 
     <Separator prefWidth="200.0" /> 
     <JFXButton buttonType="RAISED" layoutX="10.0" layoutY="441.0" onAction="#logoutAction" prefHeight="50.0" prefWidth="199.0" style="-fx-background-color: #ff033e;" stylesheets="@style.css" text="LOGOUT" textFill="WHITE"> 
     <font> 
      <Font size="16.0" /> 
     </font> 
     <styleClass> 
      <String fx:value="menu-btn" /> 
      <String fx:value="btn" /> 
     </styleClass> 
     </JFXButton> 
    </children> 
</VBox>

Der Fehler tritt auf, wenn ich auf der Logout-Button in DefaultContentController klicken, wird die "Logout" Meldung angezeigt wird, aber ich verstehe diesen Fehler nicht. Hilfe bitte. Thks.

Quelle

2016-12-29 orion

Sie Last und AnzeigeDrawerContent.fxml im initialize() Methode von RootLayoutController:

public class RootLayoutController { 

    // Reference to the main application 
    @SuppressWarnings("unused") 
    private MainApp mainApp; 

    // ... 


    /** 
    * Initializes the controller class. 
    */ 
    @FXML 
    private void initialize() { 
     try { 
      VBox box = FXMLLoader.load(getClass().getResource("DrawerContent.fxml")); 
      drawer.setSidePane(box); 

      // ... 

     } catch(IOException e) { 
      e.printStackTrace(); 
     } 
    } 

    /** 
    * Is called by the main application to give a reference back to itself 
    * 
    * @param mainApp 
    */ 
    public void setMainApp(MainApp mainApp) { 
     this.mainApp = mainApp; 
    } 

}

Natürlich schafft dies eine neue DrawerContentController auf die von DrawerContent.fxml erstellt Ansicht verknüpft. Zu keinem Zeitpunkt rufen Sie setMainApp(...) auf diesem Controller, so in diesem Fall DrawerContentController, mainApp ist null. Wenn der Benutzer die LOGOUT-Schaltfläche drückt und die Handler-Methode aufruft, erhalten Sie daher eine Nullzeigerausnahme.

Sie müssen die mainApp in der DrawerContentController initialisieren. Sie können das tun, mit:

import java.io.IOException; 

import com.jfoenix.controls.JFXDrawer; 
import com.jfoenix.controls.JFXHamburger; 
import com.jfoenix.transitions.hamburger.HamburgerBasicCloseTransition; 

import gn.kahere.car.manager.MainApp; 
import javafx.fxml.FXML; 
import javafx.fxml.FXMLLoader; 
import javafx.scene.input.MouseEvent; 
import javafx.scene.layout.VBox; 

public class RootLayoutController { 

    // Reference to the main application 

    // @SuppressWarnings("unused") // hmm if it's unused, I probably don't need it... 

    // private MainApp mainApp; 

    private DrawerContentController drawerContentController ; 

    @FXML 
    private JFXHamburger hamburger; 

    @FXML 
    private JFXDrawer drawer; 


    /** 
    * Controller 
    */ 
    public RootLayoutController() { 

    } 

    /** 
    * Initializes the controller class. 
    */ 
    @FXML 
    private void initialize() { 
     try { 
      FXMLLoader drawerContentLoader = new FXMLLoader(getClass().getResource("DrawerContent.fxml")); 
      VBox box = drawerContentLoader.load(); 
      drawer.setSidePane(box); 

      drawerContentController = drawerContentLoader.getController(); 

      HamburgerBasicCloseTransition burgerTask = new HamburgerBasicCloseTransition(hamburger); 
      burgerTask.setRate(-1); 

      hamburger.addEventHandler(MouseEvent.MOUSE_PRESSED, (e) -> { 
       burgerTask.setRate(burgerTask.getRate() * -1); 
       burgerTask.play(); 

       if(drawer.isShown()) 
        drawer.close(); 
       else 
        drawer.open(); 
      }); 
     } catch(IOException e) { 
      e.printStackTrace(); 
     } 
    } 

    /** 
    * Is called by the main application to give a reference back to itself 
    * 
    * @param mainApp 
    */ 
    public void setMainApp(MainApp mainApp) { 
     // this.mainApp = mainApp; 

     // pass the main app to the drawerContentController: 
     drawerContentController.setMainApp(mainApp); 
    } 

}

Natürlich können Sie alle redundanten Code aus Ihrer MainApp Klasse entfernen, die FXML Dateien lädt und nie zeigt deren Inhalt (warum Sie das ohnehin tun würde?):

public class MainApp extends Application { 

    private Stage primaryStage; 
    private AnchorPane rootLayout; 

    @Override 
    public void start(Stage primaryStage) { 
     this.primaryStage = primaryStage; 
     this.primaryStage.setTitle("Car Manager"); 

     // Prevent the window resizing 
     this.primaryStage.setResizable(false); 

     showLogin(); 
    } 

    /** 
    * Show the login page 
    */ 
    public void showLogin() { 
     try { 
      // Load login page 
      FXMLLoader loader = new FXMLLoader(); 
      loader.setLocation(MainApp.class.getResource("view/Login.fxml")); 
      AnchorPane login = (AnchorPane) loader.load(); 

      // Set the scene containing the login page 
      Scene scene = new Scene(login); 
      primaryStage.setScene(scene); 

      // Give the controller access to the main application 
      LoginController controller = loader.getController(); 
      controller.setMainApp(this); 

      // Show the scene 
      primaryStage.show(); 
     } catch(IOException e) { 
      e.printStackTrace(); 
     } 
    } 

    /** 
    * Initializes the root layout 
    */ 
    public void initRootLayout() { 
     try { 
      // Load root layout 
      FXMLLoader loader = new FXMLLoader(); 
      loader.setLocation(MainApp.class.getResource("view/RootLayout.fxml")); 
      rootLayout = (AnchorPane) loader.load(); 

      // Give the controller access to the main application 
      RootLayoutController controller = loader.getController(); 
      controller.setMainApp(this); 

      // Get the DrawerContentController 

      // really no point in doing that since you don't display the UI you load... 
      // FXMLLoader drawerLoader = new FXMLLoader(); 
      // drawerLoader.setLocation(MainApp.class.getResource("view/DrawerContent.fxml")); 
      // drawerLoader.load(); // Load the fxml file (and do nothing with it) 
      // DrawerContentController drawerController = drawerLoader.getController(); 
      // drawerController.setMainApp(this); 

      // Show the scene containing the root layout 
      Scene scene = new Scene(rootLayout); 
      primaryStage.setScene(scene); 
      primaryStage.show(); 
     } catch(IOException e) { 
      e.printStackTrace(); 
     } 
    } 

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

Quelle

2016-12-29 03:38:51

Dank James_D hat es funktioniert, du hast mich gerettet. Ich habe mir gesagt, dass ich mit der Initialisierung des DrawerContentControllers in der MainApp die Klasse senden kann. Aber ich habe nichts gesehen. Danke für den Rat. – orion

JavaFX: Exception in thread "JavaFX Anwendung Thread" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException

Antwort

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