JavaFX with maven - Exception in Application start method (InvocationTargetException + RuntimeException + IllegalAccessError)

Question

I am beginning learning with JavaFX but I am having issues to set up properly the project. I have been following a tutorial in order to learn how JavaFX works but when I run the project I get errors I do not know how to solve.

I have been looking for people getting the same error and I found one in stackoverflow but I have the feeling that does not correspond to my issue.

Please, may you help me ?

Thank you in advance

package com.mathieuascain.javafxtutorial;
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class Main extends Application {

    Button button;

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

    @Override
    public void start(Stage primaryStage) throws Exception {
        primaryStage.setTitle("My first JavaFX GUI");

        button = new Button();
        button.setText("Click me");

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

        Scene scene = new Scene(layout, 300, 250);
        primaryStage.setScene(scene);
        primaryStage.show();
    }
}

Pom configuration

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

<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.mathieuascain</groupId>
    <artifactId>javafx-tutorial</artifactId>
    <packaging>jar</packaging>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.14</maven.compiler.source>
        <maven.compiler.target>1.14</maven.compiler.target>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.openjfx</groupId>
            <artifactId>javafx-controls</artifactId>
            <version>16</version>
        </dependency>
        <dependency>
            <groupId>org.openjfx</groupId>
            <artifactId>javafx-maven-plugin</artifactId>
            <version>0.0.5</version>
            <type>maven-plugin</type>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.openjfx</groupId>
                <artifactId>javafx-maven-plugin</artifactId>
                <version>0.0.5</version>
                <configuration>
                    <mainClass>com.mathieuascain.javafxtutorial.Main</mainClass>
                </configuration>
            </plugin>
        </plugins>
    </build> 
</project>

Compiling errors :

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:78)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:567)
    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:78)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:567)
    at java.base/sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:1071)
Caused by: java.lang.RuntimeException: Exception in Application start method
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:900)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication$2(LauncherImpl.java:195)
    at java.base/java.lang.Thread.run(Thread.java:831)
Caused by: java.lang.IllegalAccessError: superclass access check failed: class com.sun.javafx.scene.control.ControlHelper (in unnamed module @0x9529d1f) cannot access class com.sun.javafx.scene.layout.RegionHelper (in module javafx.graphics) because module javafx.graphics does not export com.sun.javafx.scene.layout to unnamed module @0x9529d1f
    at java.base/java.lang.ClassLoader.defineClass1(Native Method)
    at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1010)
    at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:150)
    at java.base/jdk.internal.loader.BuiltinClassLoader.defineClass(BuiltinClassLoader.java:855)
    at java.base/jdk.internal.loader.BuiltinClassLoader.findClassOnClassPathOrNull(BuiltinClassLoader.java:753)
    at java.base/jdk.internal.loader.BuiltinClassLoader.loadClassOrNull(BuiltinClassLoader.java:676)
    at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:634)
    at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:182)
    at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:519)
    at javafx.scene.control.Control.<clinit>(Control.java:86)
    at com.mathieuascain.javafxtutorial.Main.start(Main.java:22)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$9(LauncherImpl.java:846)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runAndWait$12(PlatformImpl.java:474)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:447)
    at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:446)
    at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$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 com.mathieuascain.javafxtutorial.Main

Process finished with exit code 1

This question seems to almost be a duplicate of JavaFX 11: IllegalAccessError when creating Label, but since you're using Maven and the corresponding JavaFX plugin I'm not sure the solution is exactly the same. In general, however, the problem is that the javafx.controls module is not being resolved as a module (it's ending up on the class-path and its classes end up in the so-called unnamed module). — Slaw
– Slaw, Commented Mar 31, 2021 at 10:18

Dahlin · Accepted Answer · 2021-03-30 15:34:47Z

You could try adding ALL JavaFX Components like: (replace version 15 with 16)

   <!-- JavaFx -->
            <dependency>
                <groupId>org.openjfx</groupId>
                <artifactId>javafx-base</artifactId>
                <version>15</version>
            </dependency>
    
            <dependency>
                <groupId>org.openjfx</groupId>
                <artifactId>javafx-controls</artifactId>
                <version>15</version>
            </dependency>
    
            <dependency>
                <groupId>org.openjfx</groupId>
                <artifactId>javafx-graphics </artifactId>
                <version>15</version>
                <classifier>win</classifier>
            </dependency>
    
            <dependency>
                <groupId>org.openjfx</groupId>
                <artifactId>javafx-fxml</artifactId>
                <version>15</version>
            </dependency>
    
            <dependency>
                <groupId>org.openjfx</groupId>
                <artifactId>javafx-web</artifactId>
                <version>15</version>
            </dependency>
    
            <dependency>
                <groupId>org.openjfx</groupId>
                <artifactId>javafx-media</artifactId>
                <version>15</version>
            </dependency>
    
             <dependency>
                <groupId>org.openjfx</groupId>
                <artifactId>javafx-swing</artifactId>
                <version>15</version>
            </dependency>

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