Java IllegalAccessError 无法运行应用程序

Question

我正在为类(class)设置我的第一个程序，但我一直困惑为什么我的程序无法运行并尝试调试。我需要做什么来调试这个错误？

我尝试添加库，但这似乎不起作用。

import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Parent;
import javafx.scene.Scene;
import java.io.IOException;
import javafx.fxml.FXMLLoader;
import javafx.scene.control.Button;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

import java.awt.*;

public class Main extends Application {

    @Override
    public void start(Stage primaryStage) {
        try{

            Parent root = FXMLLoader.load(getClass().getResource("Sample.fxml"));
            primaryStage.setTitle("My First JavaFX GUI");
            Button button= new Button("Submit Answer");

            StackPane layout= new StackPane();
            layout.getChildren().add(button);

            Scene scene1= new Scene(layout, 300, 250);
            primaryStage.setScene(scene1);

            primaryStage.show();
        }
        catch(Exception e)
        {
            e.printStackTrace();
        }
    }
    public static void main(String[] args) {
        launch(args);
    }
}

这是我的运行控制台给我的错误:

java.lang.reflect.InvocationTargetException
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:464)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:363)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at java.base/sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:1051)
Caused by: java.lang.RuntimeException: Exception in Application start method
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:900)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication$2(LauncherImpl.java:195)
    at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: java.lang.IllegalAccessError: class com.sun.javafx.fxml.FXMLLoaderHelper (in unnamed module @0x41b2844d) cannot access class com.sun.javafx.util.Utils (in module javafx.graphics) because module javafx.graphics does not export com.sun.javafx.util to unnamed module @0x41b2844d
    at com.sun.javafx.fxml.FXMLLoaderHelper.<clinit>(FXMLLoaderHelper.java:38)
    at javafx.fxml.FXMLLoader.<clinit>(FXMLLoader.java:2056)
    at Main.start(Main.java:20)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$9(LauncherImpl.java:846)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runAndWait$12(PlatformImpl.java:455)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428)
    at java.base/java.security.AccessController.doPrivileged(Native Method)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427)
    at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
    at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:174)
    ... 1 more
Exception running application Main

Process finished with exit code 1

我希望它能够运行，但它不会运行，而且我真的不知道该在哪里采取行动。谢谢参观 !如有任何帮助，我们将不胜感激:D

Answer 1

将模块添加到模块路径中。大多数项目只需要 javafx.controls 和 javafx.fxml 但请检查您是否需要 other packages .

Run > Edit Configuration > VM Options >

--module-path /path/to/javafx-sdk-13/lib --add-modules javafx.controls,javafx.fxml

像这样:

此外，请确保您的 SDK 和项目语言级别已正确设置:

File > Project Structure > Project

确保您的 OpenFX 库已添加(手动或使用 Gradle 之类的工具):

File > Project Structure > Libraries

最后一件事，我不认为您打算在代码中import java.awt.*;。