title: JavaFX - Had java.lang.reflect.InvocationTargetException when executing JavaFX WebView Example code
body: <p>I want to try out the feature of webview in my javafx project, but I kept having java.lang.reflect.InvocationTargetException, so I even tried out the sample code for WebView from jenkov.com, I still couldn't run the application. Is there anything wrong with my configurations or is it something else? </p>
  
  <pre><code>package sample;
  
  import javafx.application.Application;
  import javafx.scene.Scene;
  import javafx.scene.layout.VBox;
  import javafx.scene.web.WebView;
  import javafx.stage.Stage;
  
  public class Main extends Application {
  
      public static void main(String[] args) {
          launch(args);
      }
  
      public void start(Stage primaryStage) {
          primaryStage.setTitle("JavaFX WebView Example");
  
          WebView webView = new WebView();
  
          webView.getEngine().load("http://google.com");
  
          VBox vBox = new VBox(webView);
          Scene scene = new Scene(vBox, 960, 600);
  
          primaryStage.setScene(scene);
          primaryStage.show();
  
      }
  }
  </code></pre>
  
  <p>This is the result I got: </p>
  
  <pre><code>"C:\Program Files\AdoptOpenJDK\jdk-11.0.4.11-openj9\bin\java.exe" --module-path "C:/Program Files/AdoptOpenJDK/javafx-sdk-11.0.2/lib" --add-modules javafx.controls,javafx.fxml --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 Community Edition 2019.1.3\lib\idea_rt.jar=51495:C:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2019.1.3\bin" -Dfile.encoding=UTF-8 -classpath "C:\Users\User\Desktop\Test\out\production\Test;C:\Program Files\AdoptOpenJDK\javafx-sdk-11.0.2\lib\javafx-swt.jar;C:\Program Files\AdoptOpenJDK\javafx-sdk-11.0.2\lib\javafx.base.jar;C:\Program Files\AdoptOpenJDK\javafx-sdk-11.0.2\lib\javafx.controls.jar;C:\Program Files\AdoptOpenJDK\javafx-sdk-11.0.2\lib\javafx.fxml.jar;C:\Program Files\AdoptOpenJDK\javafx-sdk-11.0.2\lib\javafx.graphics.jar;C:\Program Files\AdoptOpenJDK\javafx-sdk-11.0.2\lib\javafx.media.jar;C:\Program Files\AdoptOpenJDK\javafx-sdk-11.0.2\lib\javafx.swing.jar;C:\Program Files\AdoptOpenJDK\javafx-sdk-11.0.2\lib\javafx.web.jar" sample.Main
  
  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 com.sun.javafx.application.LauncherImpl$$Lambda$110.000000005B9305B0.run(Unknown Source)
      at java.base/java.lang.Thread.run(Thread.java:831)
  Caused by: java.lang.IllegalAccessError: com/sun/javafx/sg/prism/NGGroup is not visible
      at java.base/java.lang.ClassLoader.defineClassImpl(Native Method)
      at java.base/java.lang.ClassLoader.defineClassInternal(ClassLoader.java:465)
      at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:434)
      at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:174)
      at java.base/jdk.internal.loader.BuiltinClassLoader.defineClass(BuiltinClassLoader.java:1114)
      at java.base/jdk.internal.loader.BuiltinClassLoader.findClassOnClassPathOrNull(BuiltinClassLoader.java:902)
      at java.base/jdk.internal.loader.BuiltinClassLoader.loadClassOrNull(BuiltinClassLoader.java:808)
      at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:766)
      at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
      at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:1067)
      at sample.Main.start(Main.java:20)
      at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$9(LauncherImpl.java:846)
      at com.sun.javafx.application.LauncherImpl$$Lambda$113.000000005BA1B2E0.run(Unknown Source)
      at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runAndWait$12(PlatformImpl.java:455)
      at com.sun.javafx.application.PlatformImpl$$Lambda$106.000000005B73A6D0.run(Unknown Source)
      at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428)
      at com.sun.javafx.application.PlatformImpl$$Lambda$108.000000005B92FE10.run(Unknown Source)
      at java.base/java.security.AccessController.doPrivileged(AccessController.java:704)
      at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427)
      at com.sun.javafx.application.PlatformImpl$$Lambda$107.000000005B92F5B0.run(Unknown Source)
      at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
      at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
      at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:174)
      at com.sun.glass.ui.win.WinApplication$$Lambda$96.000000005B3D8280.run(Unknown Source)
      ... 1 more
  Exception running application sample.Main
  </code></pre>