Adding sound file to play

[bob john]

package Button;
 
import java.io.FileInputStream;
import java.io.IOException;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.UnsupportedAudioFileException;
import javafx.application.*;
import javafx.stage.*;
import javafx.scene.*;
import javafx.scene.layout.*;
import javafx.scene.media.Media;
import javafx.scene.media.MediaPlayer;
import javafx.scene.paint.Color;
import javafx.scene.text.Font;
import javafx.scene.text.Text;
import javafx.scene.control.*;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
 
public class Talent extends Application {
 
    Stage window;
    Scene scene1, scene2,scene3;
 
    public static void main(String[] args) {
        launch(args);
    }
 
    @Override
    public void start(Stage primaryStage) throws UnsupportedAudioFileException, IOException, LineUnavailableException {
        window = primaryStage;
 
  
        Image image = new Image(new FileInputStream("telnet.bmp"));
        
        ImageView imageView1 = new ImageView(image);
         imageView1.setFitHeight(400);
         imageView1.setFitWidth(339);
       
        
           Text tekst = new Text("Welcome to the first scene!");
           tekst.setFont(Font.font("Edwardian Script ITC", 42));
           tekst.setTranslateY(20);
           tekst.setTranslateX(160);    
           tekst.setFill(Color.LIGHTBLUE);
            
            
        Button mygt = new Button("Go to scene 2");
        mygt.setOnAction(e -> window.setScene(scene2));
      
       
        StackPane viskas = new StackPane();
        viskas.getChildren().addAll( imageView1,mygt,tekst);
        scene1 = new Scene(viskas, 500, 500);
         
      
        ///
         
         
        Button end = new Button ("backwards");
        end.setOnAction ( e -> window.setScene(scene1) );
         
        Button next = new Button ("Last stage");
        next.setOnAction ( e-> window.setScene (scene3));
        next.setTranslateY(14);
        next.setTranslateX(14);
         
        StackPane lay3 = new StackPane ();
        lay3.getChildren ().addAll (end,next);
        scene2= new Scene (lay3, 200, 200);
        scene2.setFill(Color.GREEN);
        
         
        ///
       
         
        final java.net.URL resource = getClass().getResource("mix.mp3");
        final Media media = new Media(resource.toString());
        final MediaPlayer mediaPlayer = new MediaPlayer(media);
        mediaPlayer.play();
         
        StackPane layout = new StackPane ();
        scene3 = new Scene (layout, 500,500);
         
 
 
        //Display scene 1 at first
        window.setScene(scene1);
        window.setTitle("Title Here");
        window.show();
         
    }
 
}

The code ranging from 78 to 81. Was found on random website.

This code (full code)  have buttons, who switching scenes. I wish that once user enters 3rd scene, the mp3 file to be played.
MP3 file is inserted inside project, not in package.

[bob john]

If I run, console shows:
Exception in Application start method
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
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(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at sun.launcher.LauncherHelper$FXHelper.main(Unknown Source)
Caused by: java.lang.RuntimeException: Exception in Application start method
at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:917)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$155(LauncherImpl.java:182)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NullPointerException
at Button.Talent.start(Talent.java:79)
at com.sun.javafx.application.LauncherImpl.lambda$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.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)
... 1 more
Exception running application Button.Talent

[Knute Snortum]

The problem is that the variable resource is not being set, probably because "mix.mp3" is not being found.  

[Knute Snortum]

Try putting a slash in front of media file name:

final java.net.URL resource = getClass().getResource("/mix.mp3");

[bob john]

Still, nothing happens.

[Knute Snortum]

It's a good practice to create a folder Bandymai/resources and put anything you access with getResource() there.  Barring that, you need to put the resource somewhere in the classpath.

[Ron McLeod]

Knute Snortum wrote:The problem is that the variable resource is not being set, probably because "mix.mp3" is not being found.

Knute Snortum wrote:Try putting a slash in front of media file name:

final java.net.URL resource = getClass().getResource("/mix.mp3");

bob john wrote:Still, nothing happens.

Does nothing happens mean that the you are still seeing the NullPointerException, or does that mean no sound was played?

Did you check to see if resource was non-null?

[Ron McLeod]

We had a related discussion about addressing resources in this thread a while back.