当我执行 jar 文件时，当我想从场景中更改时出现错误

Question

我正在使用 javafx-sdk-11.0.2 在 inteliJ 上使用 javaFX。我为电影制作了一个 GUI，当我想在 inteliJ 上运行它时，一切正常。但是当我创建一个 jar 文件并执行它时，一切都会再次正常工作，直到我点击一个按钮从场景切换。

这就是我点击按钮时得到的结果。请注意，并非所有按钮都有相同的问题。当我到处使用相同的代码时，我有一些按钮可以正常工作。

java --module-path "C:\Program Files\javaFX\javafx-sdk-11.0.2\lib" --add-modules javafx.controls --add-modules javafx.graphics --add-modules javafx.fxml -jar demoCinema.jar
        Exception in thread "JavaFX Application Thread" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
            at javafx.fxml/javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1787)
            at javafx.fxml/javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1670)
            at javafx.base/com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
            at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
            at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
            at javafx.base/com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
            at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
            at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
            at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
            at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
            at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
            at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
            at javafx.base/com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
            at javafx.base/com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
            at javafx.base/javafx.event.Event.fireEvent(Event.java:198)
            at javafx.graphics/javafx.scene.Node.fireEvent(Node.java:8879)
            at javafx.controls/javafx.scene.control.Button.fire(Button.java:200)
            at javafx.controls/com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:206)
            at javafx.controls/com.sun.javafx.scene.control.inputmap.InputMap.handle(InputMap.java:274)
            at javafx.base/com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218)
            at javafx.base/com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
            at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
            at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
            at javafx.base/com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
            at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
            at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
            at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
            at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
            at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
            at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
            at javafx.base/com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
            at javafx.base/com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
            at javafx.base/javafx.event.Event.fireEvent(Event.java:198)
            at javafx.graphics/javafx.scene.Scene$MouseHandler.process(Scene.java:3851)
            at javafx.graphics/javafx.scene.Scene$MouseHandler.access00(Scene.java:3579)
            at javafx.graphics/javafx.scene.Scene.processMouseEvent(Scene.java:1849)
            at javafx.graphics/javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2588)
            at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:397)
            at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:295)
            at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
            at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent(GlassViewEventHandler.java:434)
            at javafx.graphics/com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:390)
            at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:433)
            at javafx.graphics/com.sun.glass.ui.View.handleMouseEvent(View.java:556)
            at javafx.graphics/com.sun.glass.ui.View.notifyMouse(View.java:942)
            at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
            at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop(WinApplication.java:174)
            at java.base/java.lang.Thread.run(Thread.java:832)
    Caused by: java.lang.reflect.InvocationTargetException
            at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
            at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
            at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
            at java.base/java.lang.reflect.Method.invoke(Method.java:564)
            at com.sun.javafx.reflect.Trampoline.invoke(MethodUtil.java:76)
            at jdk.internal.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
            at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
            at java.base/java.lang.reflect.Method.invoke(Method.java:564)
            at javafx.base/com.sun.javafx.reflect.MethodUtil.invoke(MethodUtil.java:273)
            at javafx.fxml/com.sun.javafx.fxml.MethodHelper.invoke(MethodHelper.java:83)
            at javafx.fxml/javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1782)
            ... 47 more
    Caused by: java.lang.NullPointerException: Location is required.
            at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3230)
            at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3194)
            at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3163)
            at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3136)
            at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3113)
            at javafx.fxml/javafx.fxml.FXMLLoader.load(FXMLLoader.java:3106)
            at sample.Controller.reserverenAction(Controller.java:52)
            ... 58 more

下面是我的场景切换代码

public void reserverenAction(ActionEvent actionEvent) throws IOException {
        Parent naarAdmin = FXMLLoader.load(getClass().getResource("klantPagina.fxml"));
        Scene adminScene = new Scene(naarAdmin);
        Stage window = (Stage) ((Node)actionEvent.getSource()).getScene().getWindow();
        window.setScene(adminScene);
        window.show();
    }

下面是我的主要内容class

package sample;

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.image.Image;
import javafx.stage.Stage;

public class Main extends Application {

    @Override
    public void start(Stage primaryStage) throws Exception{
        Parent root = FXMLLoader.load(getClass().getResource("sample.fxml"));
        primaryStage.getIcons().add(new Image("logoKinepolis/KINE_CMYK.png"));
        primaryStage.setTitle("Cinema");
        primaryStage.setScene(new Scene(root));
        primaryStage.setResizable(false);
        primaryStage.show();
    }


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

我希望有人能帮助我，因为它真的很糟糕。我还尝试使用另一个 javafx sdk 版本，但这没有帮助。提前致谢

Answer 1

资源 /sample/klantPagina.fxml 可能未找到并在加载时给出 NullPointerException。

    Parent naarAdmin = FXMLLoader.load(getClass().getResource("klantPagina.fxml"));

getClass()的包决定目录，sample大概。

因此请查看 jar（zip 格式）或资源的 class 路径。

必须区分大小写。在 Windows 上，有时扩展名会被混合，实际上可能有一个文件 klantPagina.fxml.fxml 但这里不太可能。

您可以尝试绝对路径：

    Parent naarAdmin = FXMLLoader.load(Main.class.getResource("/klantPagina.fxml"));

当我执行 jar 文件时，当我想从场景中更改时出现错误

When I execute a jar file I get an error when I want to change from scene

java

user-interface

javafx

executable-jar

scene