title: JavaFX 11: IllegalAccessError when creating Label
body: <p>This question is likely about the same issue as <a href="https://stackoverflow.com/questions/53600855/invocationtargetexception-when-trying-to-run-a-javafx-program">this one</a>, but it appears the asker of that one hasn't added enough information to receive a helpful response.</p>
  
  <p>I am trying to run a JavaFx application with JDK and JavaFx SDK version 11.0.2.</p>
  
  <p>This code works exactly as expected, producing an empty window:</p>
  
  <pre class="lang-java prettyprint-override"><code>import javafx.application.Application;
  import javafx.scene.Scene;
  import javafx.scene.layout.StackPane;
  import javafx.stage.Stage;
  
  public class Main extends Application {
  
      public void start(Stage primaryStage) throws Exception {
          StackPane root = new StackPane();
          primaryStage.setScene(new Scene(root, 420, 420));
          primaryStage.show();
      }
  
  
      public static void main(String[] args) {
          launch(args);
      }
  }
  </code></pre>
  
  <p>However, if I try to add a label to the <code>StackPane</code>, an exception is thrown.</p>
  
  <pre class="lang-java prettyprint-override"><code>import ...
  import javafx.scene.control.Label;
  
  public class Main extends Application {
  
      public void start(Stage primaryStage) throws Exception {
          StackPane root = new StackPane();
          root.getChildren().add(new Label("42"));
          primaryStage.setScene(new Scene(root, 420, 420));
          primaryStage.show();
      }
  
  
      public static void main(String[] args) {
          launch(args);
      }
  }
  </code></pre>
  
  <p>The stack trace it produces looks like this (line 13 in Main is where the Label is created):</p>
  
  <pre><code>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$2(LauncherImpl.java:195)
      at java.base/java.lang.Thread.run(Thread.java:834)
  Caused by: java.lang.IllegalAccessError: superclass access check failed: class com.sun.javafx.scene.control.ControlHelper (in unnamed module @0xbbd2743) cannot access class com.sun.javafx.scene.layout.RegionHelper (in module javafx.graphics) because module javafx.graphics does not export com.sun.javafx.scene.layout to unnamed module @0xbbd2743
      at java.base/java.lang.ClassLoader.defineClass1(Native Method)
      at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1016)
      at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:174)
      at java.base/jdk.internal.loader.BuiltinClassLoader.defineClass(BuiltinClassLoader.java:802)
      at java.base/jdk.internal.loader.BuiltinClassLoader.findClassOnClassPathOrNull(BuiltinClassLoader.java:700)
      at java.base/jdk.internal.loader.BuiltinClassLoader.loadClassOrNull(BuiltinClassLoader.java:623)
      at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581)
      at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
      at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
      at javafx.scene.control.Control.&lt;clinit&gt;(Control.java:86)
      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
  </code></pre>
  
  <p>I am running a recent version of IntelliJ Idea on Kubuntu. I downloaded the Oracle JDK as well as JavaFX, from the official websites</p>
  
  <p>I put <code>javafx-sdk-11.0.2</code> in the directory <code>/usr/lib/jvm/</code> and <code>jdk-11.0.2</code> is in the same directory.</p>
  
  <p>In IntelliJ Idea, I believe I have correctly chosen the JDK, and I have added <code>/usr/lib/jvm/javafx-sdk-11.0.2/lib</code> as a library.</p>
  
  <p>IntelliJ Idea is using this command to launch the Application (split up for readability):</p>
  
  <pre><code>/usr/lib/jvm/jdk-11.0.2/bin/java
    -Djava.library.path=/usr/lib/jvm/javafx-sdk-11.0.2/lib
    --add-modules javafx.base,javafx.graphics
    --add-reads javafx.base=ALL-UNNAMED
    --add-reads javafx.graphics=ALL-UNNAMED
    -javaagent:/opt/jetbrains/idea-IU-183.4886.37/lib/idea_rt.jar=36031:/opt/jetbrains/idea-IU-183.4886.37/bin
    -Dfile.encoding=UTF-8
    -classpath
      /home/rm/IdeaProjects/JfxPlayground/out/production/JfxPlayground
      :/usr/lib/jvm/javafx-sdk-11.0.2/lib/src.zip
      :/usr/lib/jvm/javafx-sdk-11.0.2/lib/javafx-swt.jar
      :/usr/lib/jvm/javafx-sdk-11.0.2/lib/javafx.web.jar
      :/usr/lib/jvm/javafx-sdk-11.0.2/lib/javafx.base.jar
      :/usr/lib/jvm/javafx-sdk-11.0.2/lib/javafx.fxml.jar
      :/usr/lib/jvm/javafx-sdk-11.0.2/lib/javafx.media.jar
      :/usr/lib/jvm/javafx-sdk-11.0.2/lib/javafx.swing.jar
      :/usr/lib/jvm/javafx-sdk-11.0.2/lib/javafx.controls.jar
      :/usr/lib/jvm/javafx-sdk-11.0.2/lib/javafx.graphics.jar
    -p
      /usr/lib/jvm/javafx-sdk-11.0.2/lib/javafx.base.jar
      :/usr/lib/jvm/javafx-sdk-11.0.2/lib/javafx.graphics.jar
    sample.Main
  </code></pre>
  
  <p>I have not modified any VM options.</p>
  
  <p>How can I fix this error? Is it a bug in JavaFx?</p>