Cannot Launch JavaFX application in IntelliJ with Java 11

Question

I am trying to create a JavaFX application with IntelliJ and Java 11.

I can compile the application correctly, but when I try to debug it, I get the following error:

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$2(LauncherImpl.java:195)
    at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: java.lang.IllegalAccessError: class com.sun.javafx.fxml.FXMLLoaderHelper (in unnamed module @0x7920ba90) cannot access class com.sun.javafx.util.Utils (in module javafx.graphics) because module javafx.graphics does not export com.sun.javafx.util to unnamed module @0x7920ba90
    at com.sun.javafx.fxml.FXMLLoaderHelper.<clinit>(FXMLLoaderHelper.java:38)
    at javafx.fxml.FXMLLoader.<clinit>(FXMLLoader.java:2056)
    at sample.Main.start(Main.java:13)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$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$$$capture(InvokeLaterDispatcher.java:96)
    at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java)
    at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:174)
    ... 1 more
Exception running application sample.Main

I have creted the project by creating a new JavaFX Project, then I added a framework (Maven) and added the following to my POM file:

<dependencies>
        <dependency>
            <groupId>org.openjfx</groupId>
            <artifactId>javafx-controls</artifactId>
            <version>11</version>
        </dependency>
        <dependency>
            <groupId>org.openjfx</groupId>
            <artifactId>javafx-fxml</artifactId>
            <version>11</version>
        </dependency>
    </dependencies>

This is my project .iml file:

<?xml version="1.0" encoding="UTF-8"?>
<module org.jetbrains.idea.maven.project.MavenProjectsManager.isMavenModule="true" type="JAVA_MODULE" version="4">
  <component name="NewModuleRootManager" LANGUAGE_LEVEL="JDK_11">
    <output url="file://$MODULE_DIR$/target/classes" />
    <output-test url="file://$MODULE_DIR$/target/test-classes" />
    <content url="file://$MODULE_DIR$">
      <sourceFolder url="file://$MODULE_DIR$/src/main/java" isTestSource="false" />
      <sourceFolder url="file://$MODULE_DIR$/src/main/resources" type="java-resource" />
      <sourceFolder url="file://$MODULE_DIR$/src/test/java" isTestSource="true" />
      <excludeFolder url="file://$MODULE_DIR$/target" />
    </content>
    <orderEntry type="inheritedJdk" />
    <orderEntry type="sourceFolder" forTests="false" />
    <orderEntry type="library" name="Maven: org.openjfx:javafx-controls:11" level="project" />
    <orderEntry type="library" name="Maven: org.openjfx:javafx-controls:win:11" level="project" />
    <orderEntry type="library" name="Maven: org.openjfx:javafx-fxml:11" level="project" />
    <orderEntry type="library" name="Maven: org.openjfx:javafx-fxml:win:11" level="project" />
    <orderEntry type="library" name="Maven: org.openjfx:javafx-graphics:11" level="project" />
    <orderEntry type="library" name="Maven: org.openjfx:javafx-graphics:win:11" level="project" />
    <orderEntry type="library" name="Maven: org.openjfx:javafx-base:11" level="project" />
    <orderEntry type="library" name="Maven: org.openjfx:javafx-base:win:11" level="project" />
  </component>
</module>

What else should I do, or what am I doing wrong?

From the IllegalAccessError message I'd guess javafx.fxml is not on the modulepath whereas javafx.graphics is. — Slaw
– Slaw, Commented Dec 24, 2018 at 0:33
Are you sure you added the javafx.fxml module properly. It should include the module name in the stacktrace. (at javafx.fxml/javafx.fxml.FXMLLoader....) — fabian
– fabian, Commented Dec 24, 2018 at 0:37
@fabian what does properly mean? I added that dependency within the pom file and intellij does the import automatically. how should I do it? — Miguel Mesquita Alfaiate
– Miguel Mesquita Alfaiate, Commented Dec 24, 2018 at 0:39

Barosanu240 · Accepted Answer · 2019-10-15 07:39:33Z

1

You can't avoid having a module.info file for javaFx 11. Check this other post: Can't get JavaFX to run in Eclipse

The error is similar.

answered Oct 15, 2019 at 7:39

Barosanu240

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Comments

igonejack · Accepted Answer · 2020-04-24 09:48:17Z

0

Add a module-info.java under main/java if you are using JDK 9+.

module sample {
    requires javafx.controls;
    requires javafx.graphics;
}

answered Apr 24, 2020 at 9:48

igonejack

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