IllegalAccessError when trying to run application from command line without jfx maven plugin

[ntherrien]

Hi!

I would like to be able to run the HelloWorld example without using the maven java fx plugin.

Note: if I use the maven plugin, i can start the application no problem. I just need to be able to do this without the plugin.

I am getting the following error when trying to run main() directly:

"C:\Program Files\Java\jdk-11.0.2\bin\java.exe" --add-modules javafx.base,javafx.graphics --add-reads javafx.base=ALL-UNNAMED --add-reads javafx.graphics=ALL-UNNAMED "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA 2018.3.1\lib\idea_rt.jar=53035:C:\Program Files\JetBrains\IntelliJ IDEA 2018.3.1\bin" -Dfile.encoding=UTF-8 -classpath C:\studio\projects\javafx8-buildtest\target\classes;C:\Users\ntherrien\.m2\repository\org\openjfx\javafx-controls\11.0.2\javafx-controls-11.0.2.jar;C:\Users\ntherrien\.m2\repository\org\openjfx\javafx-controls\11.0.2\javafx-controls-11.0.2-win.jar;C:\Users\ntherrien\.m2\repository\org\openjfx\javafx-graphics\11.0.2\javafx-graphics-11.0.2.jar;C:\Users\ntherrien\.m2\repository\org\openjfx\javafx-graphics\11.0.2\javafx-graphics-11.0.2-win.jar;C:\Users\ntherrien\.m2\repository\org\openjfx\javafx-base\11.0.2\javafx-base-11.0.2.jar;C:\Users\ntherrien\.m2\repository\org\openjfx\javafx-base\11.0.2\javafx-base-11.0.2-win.jar;C:\Users\ntherrien\.m2\repository\org\openjfx\javafx-fxml\11.0.2\javafx-fxml-11.0.2.jar;C:\Users\ntherrien\.m2\repository\org\openjfx\javafx-fxml\11.0.2\javafx-fxml-11.0.2-win.jar -p C:\Users\ntherrien\.m2\repository\org\openjfx\javafx-base\11.0.2\javafx-base-11.0.2-win.jar;C:\Users\ntherrien\.m2\repository\org\openjfx\javafx-graphics\11.0.2\javafx-graphics-11.0.2-win.jar helloworld.HelloWorld
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$2(LauncherImpl.java:195)
	at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: java.lang.IllegalAccessError: superclass access check failed: class com.sun.javafx.scene.control.ControlHelper (in unnamed module @0x4bc6ef18) cannot access class com.sun.javafx.scene.layout.RegionHelper (in module javafx.graphics) because module javafx.graphics does not export com.sun.javafx.scene.layout to unnamed module @0x4bc6ef18
	at java.base/java.lang.ClassLoader.defineClass1(Native Method)
	at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1016)
	at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:174)
	at java.base/jdk.internal.loader.BuiltinClassLoader.defineClass(BuiltinClassLoader.java:802)
	at java.base/jdk.internal.loader.BuiltinClassLoader.findClassOnClassPathOrNull(BuiltinClassLoader.java:700)
	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClassOrNull(BuiltinClassLoader.java:623)
	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581)
	at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
	at javafx.scene.control.Control.<clinit>(Control.java:86)
	at helloworld.HelloWorld.start(HelloWorld.java:15)
	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 helloworld.HelloWorld

Process finished with exit code 1

Here is my pom file:

<?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.motorolasolutions.simulation.experimental</groupId>
    <artifactId>javafx8-buildtest</artifactId>
    <version>1.0.0-SNAPSHOT</version>
    <packaging>jar</packaging>

    <dependencies>

        <dependency>
            <groupId>org.openjfx</groupId>
            <artifactId>javafx-controls</artifactId>
            <version>11.0.2</version>
        </dependency>
        <dependency>
            <groupId>org.openjfx</groupId>
            <artifactId>javafx-fxml</artifactId>
            <version>11.0.2</version>
        </dependency>


    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.8.1</version>
                <configuration>
                    <!--                    <target>1.8</target>-->
                    <!--                    <source>1.8</source>-->
                    <release>11</release>
                </configuration>
            </plugin>

            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-jar-plugin</artifactId>
                <version>3.0.2</version>
                <configuration>
                    <archive>
                        <manifest>
                            <addDefaultImplementationEntries>true</addDefaultImplementationEntries>
                            <addClasspath>true</addClasspath>
                            <mainClass>helloworld.HelloWorld</mainClass>
                            <useUniqueVersions>false</useUniqueVersions>
                        </manifest>
                    </archive>
                </configuration>
            </plugin>

            <plugin>
                <groupId>org.openjfx</groupId>
                <artifactId>javafx-maven-plugin</artifactId>
                <version>0.0.2</version>
                <configuration>
                    <mainClass>helloworld.HelloWorld</mainClass>
                </configuration>
            </plugin>


        </plugins>
    </build>

</project>

[kevinrushforth]

There are instructions on the openjfx.io community website. There are two approaches you can take:

1. Download the JavaFX SDK and add that to your module path as described on this page

2. Download the JavaFX jmods and create a custom Java runtime including the javafx modules jlinked in as decribed in the Custom JDK+JavaFX image section of this page.