运行第一个JavaFX模块化程序时出现java异常

Question

我对java没有太多的经验，但是在阅读了另外几个线程之后，我认为我的程序是如何设置的，但似乎无法解决这个问题。基本上我有一个简单的JavaFX程序，如下所示

package systemApp;

import javafx.application.Application;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class SystemTestGUI extends Application{

  @Override
  public void start(Stage primaryStage){

                
    // create a new scene and add it to the stage         
    Scene scene = new Scene(null);         
    primaryStage.setScene(scene);         
    primaryStage.setTitle("Test Title");        
    primaryStage.show();   
    
  }

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

}

最初，我无法访问javafx导入上的错误，因为我只处理过非模块化项目和javafx，我做了一些阅读，并将所需的添加到我的模块信息中。java文件。现在看起来是这样的：

module System {
  requires javafx.graphics;
}

但是，当我尝试运行该程序时，我得到了以下堆栈跟踪，我不完全确信：

    Exception in Application constructor
Exception in thread "main" 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 java.base/sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:1051)
Caused by: java.lang.RuntimeException: Unable to construct Application instance: class systemApp.SystemTestGUI
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:890)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication$2(LauncherImpl.java:195)
    at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: java.lang.IllegalAccessException: class com.sun.javafx.application.LauncherImpl (in module javafx.graphics) cannot access class systemApp.SystemTestGUI (in module System) because module System does not export systemApp to module javafx.graphics
    at java.base/jdk.internal.reflect.Reflection.newIllegalAccessException(Reflection.java:361)
    at java.base/java.lang.reflect.AccessibleObject.checkAccess(AccessibleObject.java:591)
    at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:481)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$8(LauncherImpl.java:802)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$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

读完这篇文章后： How to fix Exception in Application constructor

我将这一行添加到我的模块信息中。爪哇：

exports com.systemApp.SystemTestGUI to javafx.graphics;

但是，悬停时出现以下错误：

The package com.systemApp.SystemTestGUI does not exist or is empty

有人能指出我哪里出了问题吗。我对软件包和模块的理解是有限的，所以我可能会做一些愚蠢的事情，所以任何方向都会很好