JavaFX: creating a Media Object causes java.lang.reflect.InvocationTargetException Error

Question

I'm currently working on a simple game and I'm trying to implement sound with JavaFX and I get a java.lang.reflect.InvocationTargetException error when creating a Media object. I have tried:

Media media = new Media("file:sounds/test.mp3");

Media media = new Media(new File("file:sound/test.mp3").toURI().toString());

and also both with the complete file path on my PC.

This is the error I'm getting:

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: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:62)
    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$FXHelper.main(LauncherHelper.java:1051)
Caused by: java.lang.RuntimeException: Exception in Application start method
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:900)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication$2(LauncherImpl.java:195)
    at java.base/java.lang.Thread.run(Thread.java:830)
Caused by: java.lang.NoClassDefFoundError: javafx/scene/media/Media
    at application.Main.start(Main.java:14)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$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$10(PlatformImpl.java:428)
    at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$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$3(WinApplication.java:174)
    ... 1 more
Caused by: java.lang.ClassNotFoundException: javafx.scene.media.Media
    at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:602)
    at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
    at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
    ... 10 more
Exception running application application.Main```

You're also creating the URI to your resource incorrectly. Check out [How do I determine the correct path for FXML files, CSS files, Images, and other resources needed by my JavaFX Application?](https://stackoverflow.com/questions/61531317). — Slaw, Aug 12 '20 at 20:20

score 2 · Accepted Answer · answered Aug 12 '20 at 17:03

The error message says NoClassDefFoundError: javafx/scene/media/Media which means that it is not finding the Media classes.

The solution is to add vm arguments to your project.

Right click project > Run As > Run configurations ...

Click on Arguments and paste the following in vm arguments:

--module-path "/path/to/javafx-sdk/lib" --add-modules javafx.media

Depending on your project, you may have to add javafx.controls and javafx.fxml as well.

--module-path "/path/to/javafx-sdk/lib" --add-modules javafx.controls,javafx.fxml,javafx.media

Replace /path/to/javafx-sdk/lib with the actual path of the lib folder in your system.

JavaFX: creating a Media Object causes java.lang.reflect.InvocationTargetException Error

1 Answers1