JavaFx 错误：应用程序启动方法中的异常

Question

我正在尝试使用 intelliJ IDEA 创建我的第一个 JavaFX 程序

我得到了这个错误：

Exception in Application start method
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$2(LauncherImpl.java:195)
at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: java.lang.IllegalAccessError: class 
com.sun.javafx.fxml.FXMLLoaderHelper (in unnamed module 
@0x5ba89dd0) cannot access class com.sun.javafx.util.Utils (in 
module javafx.graphics) because module javafx.graphics does not 
export com.sun.javafx.util to unnamed module @0x5ba89dd0
at com.sun.javafx.fxml.FXMLLoaderHelper.<clinit> 
(FXMLLoaderHelper.java:38)
at javafx.fxml.FXMLLoader.<clinit>(FXMLLoader.java:2056)
at sample.Main.start(Main.java:13)
at 
javafx.graphics/com.sun.javafx.application.LauncherImpl.
lambda$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.gtk.GtkApplication._runLoop
(Native Method)
at 
javafx.graphics/com.sun.glass.ui.gtk.GtkApplication.
lambda$runLoop$11(GtkApplication.java:277)
... 1 more
Exception running application sample.Main

这是我的 FXML 文件：

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

<?import javafx.scene.control.Label?>
 <?import javafx.scene.layout.AnchorPane?>

 <AnchorPane prefHeight="386.0" prefWidth="621.0" 
 xmlns="http://javafx.com/javafx/8.0.172-ea" 
 xmlns:fx="http://javafx.com/fxml" fx:controller="sample.Controller">
 <children>
  <Label fx:id="m" layoutX="282.0" layoutY="192.0" text="this is a 
  test  " />
</children>
</AnchorPane>`

main.java：

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

public class Main extends Application {

@Override
public void start(Stage primaryStage) throws Exception{
Parent root=   
FXMLLoader.load(getClass().getResource("Main.fxml"));
    primaryStage.setTitle("Hello World");
    primaryStage.setScene(new Scene(root, 300, 275));
     primaryStage.show();
  }


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

  }}

这是项目结构：

project structure

我什至更改了 fxml 文件的位置，但他一直收到同样的错误。

FXML 文件和 Main.java 在同一个包中

我是 Ubuntu

Answer 1

我找到了解决方案，我已将 JavaFX SDK 添加到模块中并修改了 module-info.java 文件，因为我使用的是 jdk 11

module project-name {
requires javafx.fxml;
requires javafx.controls;

opens sample;
}