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线程“ JavaFX应用程序线程”中的异常java.lang.RuntimeException：java.lang.reflect.InvocationTargetException JavaFX FXML

• 问答

我有几个带有相应控制文件的fxml文件。除了一个，它们都工作。那个曾经工作。这是错误日志。我正在使用Netbeans 12.0 beta 2和Maven。我也在使用Scenebuilder。我正在使用6个主要的fxml文件。除了browse.fxml以外，所有其他功能均有效。 

Exception in thread "JavaFX Application Thread" java.lang.RuntimeException: java.lang.reflect.invocationTargetException
    at com.mycompany.kioskapp2.App.loadFXML(App.java:34)
    at com.mycompany.kioskapp2.App.setRoot(App.java:29)
    at com.mycompany.kioskapp2.PrimaryController.BrowseItemsButtonaction(PrimaryController.java:24)

browse.fxml

App.java 

public class App extends Application {

    private static Scene scene;
    public static String username,Password;

    @Override
    public void start(Stage stage) throws IOException {
        scene = new Scene(loadFXML("primary"),800,700);
        stage.setTitle("Grogan Vending");
        stage.setScene(scene);
        stage.show();
    }

    static void setRoot(String fxml) throws IOException {
        System.out.println("in setRoot");
        scene.setRoot(loadFXML(fxml));
    }

    private static Parent loadFXML(String fxml) throws IOException {
        FXMLLoader fxmlLoader = new FXMLLoader(App.class.getResource(fxml + ".fxml"));
        return fxmlLoader.load();
    }

    @SuppressWarnings("empty-statement")
    public static void Verifyusername(String user,String passwd) throws IOException {
        System.out.println("in App.Verifyusername");
        Boolean bool1 = false;
        Boolean bool2 = false;
        Boolean found1 = false;
        Boolean found2 = false;
        String savestr = null;
        try {
            try (FileReader reader = new FileReader("C:\\Users\\Skibum.DESKTOP-DBDQH1D\\Documents\\NetBeansProjects\\KioskApp2\\src\\main\\resources\\com\\mycompany\\kioskapp2\\LoginFile.txt")) {
                BufferedReader bufferedReader = new BufferedReader(reader);

                String dbline;

                while ((dbline = bufferedReader.readLine()) != null) {
                    bool1 = dbline.contains(user);
                    if (bool1 == true) {
                        found1 = true;
                        found2 = dbline.contains(passwd);
                        savestr = dbline;
                    }
                }
            }

        } catch (IOException e) {
            e.printStackTrace();
        }
        if (found2 == false) {
            App.setRoot("passwderr");
        }
        if (found1 == false) {
            try {
                App.setRoot("usernameerr");
            } catch (IOException ex) {
                Logger.getLogger(App.class.getName()).log(Level.SEVERE,null,ex);
            }
        }
        if (found1 == true && found2 == true) {
            String result[] = savestr.split(",");
            for (String temp: result){

            }
            System.out.println(result[2]);
            App.setRoot("primary");
        }
    }

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

PrimaryController.java 

public class PrimaryController {

    @FXML private Text actiontarget;

    @FXML private void LoginButtonaction() throws IOException {
        App.setRoot("login");
        System.out.println("Login button pressed");
    }

    @FXML private void NewaccountButtonaction() throws IOException {
        App.setRoot("newaccount");
        System.out.println("New account button pressed");
    }

    @FXML private void BrowseItemsButtonaction() throws IOException {
        App.setRoot("browse");
        System.out.println("Browse Items button pressed");
    }

    @FXML private void ExpenseacctButtonaction()throws IOException {
        App.setRoot("expenseacct");
        System.out.println("expense acct button pressed");
    }

    @FXML private void HelpButtonaction()throws IOException {
        App.setRoot("help");
        System.out.println("Help button pressed");
    }

    @FXML private void SuggestButtonaction()throws IOException {
        App.setRoot("suggestions");
        System.out.println("Suggestions button pressed");
    }

}

堆栈跟踪

    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$4(WinApplication.java:186)
at java.lang.Thread.run(Thread.java:748)
    Caused by: java.lang.reflect.invocationTargetException
at sun.reflect.NativeMethodaccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodaccessorImpl.invoke(NativeMethodaccessorImpl.java:62)
at sun.reflect.DelegatingMethodaccessorImpl.invoke(DelegatingMethodaccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
at sun.reflect.GeneratedMethodaccessor1.invoke(Unknown Source)
at sun.reflect.DelegatingMethodaccessorImpl.invoke(DelegatingMethodaccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1771)
... 48 more
    Caused by: javafx.fxml.LoadException: 
    /C:/Users/Skibum.DESKTOP-DBDQH1D/Documents/NetBeansProjects/KioskApp2/target/classes/com/mycompany/kioskapp2/browse.fxml:16

at javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2601)
at javafx.fxml.FXMLLoader.access$700(FXMLLoader.java:103)
at javafx.fxml.FXMLLoader$ValueElement.processAttribute(FXMLLoader.java:932)
at javafx.fxml.FXMLLoader$InstanceDeclarationElement.processAttribute(FXMLLoader.java:971)
at javafx.fxml.FXMLLoader$Element.processStartElement(FXMLLoader.java:220)
at javafx.fxml.FXMLLoader$ValueElement.processStartElement(FXMLLoader.java:744)
at javafx.fxml.FXMLLoader.processStartElement(FXMLLoader.java:2707)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2527)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2441)
at javafx.fxml.FXMLLoader.load(FXMLLoader.java:2409)
at com.mycompany.kioskapp2.App.loadFXML(App.java:34)
at com.mycompany.kioskapp2.App.setRoot(App.java:29)
at com.mycompany.kioskapp2.PrimaryController.BrowseItemsButtonaction(PrimaryController.java:24)
... 58 more
    Caused by: java.lang.InstantiationException
at sun.reflect.InstantiationExceptionConstructoraccessorImpl.newInstance(InstantiationExceptionConstructoraccessorImpl.java:48)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at java.lang.Class.newInstance(Class.java:442)
at sun.reflect.misc.ReflectUtil.newInstance(ReflectUtil.java:51)
at javafx.fxml.FXMLLoader$ValueElement.processAttribute(FXMLLoader.java:927)
... 68 more
iCMS 回答：线程“ JavaFX应用程序线程”中的异常java.lang.RuntimeException：java.lang.reflect.InvocationTargetException JavaFX FXML

您缺少事件类型是函数的参数

BrowseItemsButtonAction()

应该是

BrowseItemsButtonAction(MouseEvent event)
,

我解决了这个问题。我使用的是不必要的静态类。我删除了静态定义，它起作用了。

fxmljavajavafxscenebuilder
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