JavaFX: “Toolkit” not initialized when trying to play an mp3 file through MediaPlayer class

Question

I'm trying to make a simple mp3 play in the background of my program using the following:

Media med = new Media(getClass().getResource("intro.mp3").toExternalForm());
MediaPlayer mPlayer = new MediaPlayer(med);
mPlayer.play();

The intro.mp3 file is placed in the bin folder of my package, along with the other .class files.

The problem is that my program terminates with:

Exception in thread "main" java.lang.IllegalStateException: Toolkit not initialized

Full termination log is:

Device "Intel(R) HD Graphics Family" (\\.\DISPLAY1) initialization failed : 
WARNING: bad driver version detected, device disabled. Please update your driver to at least version 8.15.10.2302

Exception in thread "main" java.lang.IllegalStateException: Toolkit not initialized
    at com.sun.javafx.application.PlatformImpl.runLater(PlatformImpl.java:153)
    at com.sun.javafx.application.PlatformImpl.runLater(PlatformImpl.java:148)
    at javafx.application.Platform.runLater(Platform.java:52)
    at javafx.scene.media.MediaPlayer.init(MediaPlayer.java:450)
    at javafx.scene.media.MediaPlayer.<init>(MediaPlayer.java:365)
    at PokerApp.<init>(PokerApp.java:33)
    at PokerApp.main(PokerApp.java:105)

Anybody have any ideas as per the cause of the problem?

Answer 1

JavaFX performs "hidden" initialization on start. Running MediaPlayer doesn't trigger initialization.

The easiest ways to trigger it are:

• have Application.launch() executed
• have Application based program being run from jar packaged by fx ant tasks (e.g. built from Netbeans JavaFX project)
• have JFXPanel started
• call Platform.startup(Runnable) (Java 9+)

Answer 2

To avoid initialization Exception you have to either invoke Application.launch() method or simply instantiate a new JFXPanel() class (even if it isn’t used for anything). This will initiate JavaFxRuntime when application is started

To instantiate JFXPanel add below line in your code

 final JFXPanel fxPanel = new JFXPanel();

Import following package

import javafx.embed.swing.JFXPanel;

Answer 3

There's also way to initialize toolkit explicitly, by calling: com.sun.javafx.application.PlatformImpl#startup(Runnable)

Little bit hacky, due to using *Impl, but is useful, if you don't want to use Application or JXFPanel for some reason.

Answer 4

see http://www.programcreek.com/java-api-examples/index.php?api=com.sun.javafx.application.PlatformImpl

com.sun.javafx.application.PlatformImpl.startup(()->{});