JavaFX Playing AudioClip,InvocationTargetException

Question

I am trying to play mp3 file and getting an exception. Here is my code and stack trace. My sound is in my workspace.

public class Main extends Application {
//my code
    @Override 
    public void start(Stage primaryStage) {
        URL resource = getClass().getResource("/Alistirma/src/IkinciAlistirma/hated.mp3"); //its in my workspace
        AudioClip clip = new AudioClip(resource.toString()); //line 21

        final Button button = new Button("Play"); //simple button just for playing clip
        button.setOnAction(new EventHandler<ActionEvent>() {

            @Override
            public void handle(ActionEvent event) {
                // TODO Auto-generated method stub
                clip.play();
            }
        });
               //after here nothing important for my problem.
               //basic FX stuff
    }

    public static void main(String[] args) {
        launch(args);
    }
}

This is just simple code for playing mp3 however i get an exception, Here is stack trace

Exception in Application start method
java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:389)
    at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:328)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:767)
Caused by: java.lang.RuntimeException: Exception in Application start method
    at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:917)
    at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$155(LauncherImpl.java:182)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException
    at IkinciAlistirma.Main.start(Main.java:21)
    at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$162(LauncherImpl.java:863)
    at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$175(PlatformImpl.java:326)
    at com.sun.javafx.application.PlatformImpl.lambda$null$173(PlatformImpl.java:295)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.javafx.application.PlatformImpl.lambda$runLater$174(PlatformImpl.java:294)
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
    at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
    at com.sun.glass.ui.gtk.GtkApplication.lambda$null$49(GtkApplication.java:139)
    ... 1 more
Exception running application IkinciAlistirma.Main

Answer 1

The problem is here :

URL resource = URL resource = getClass().getResource("/Alistirma/src/IkinciAlistirma/hated.mp3"); 

First : Your mp3 file is not reachable from your workspace with getResource(String path) method. Depending on your environment and IDE, it will sarch for "Alistirma/src/IkinciAlistirma/hated.mp3" in different place in your project. You can find the start point folder where the getResource(String path) is searching for your resource by printing the URL given by getResource(".") and then deduct where you want to put your file. If you want to keep your file where it is, you still can reach it with the File class.

Second : why URL resource = URL resource = ? copy/paste fail I suppose ;) ?