Take snapshot of your JavaFX application

Scene.snapshot() takes a snapshot of scene and returns the rendered image when it is ready.

Example:

package javafxsnapshot;

import java.io.File;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javafx.application.Application;
import javafx.embed.swing.SwingFXUtils;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.image.WritableImage;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;
import javax.imageio.ImageIO;

/**
 *
 * @web http://java-buddy.blogspot.com
 */
public class JavaFXSnapshot extends Application {
    
    @Override
    public void start(Stage primaryStage) {
        
        StackPane root = new StackPane();
        Scene scene = new Scene(root, 300, 250);
        
        Button btn = new Button();
        btn.setText("Say 'Hello World'");
        btn.setOnAction(new EventHandler<ActionEvent>() {
            
            @Override
            public void handle(ActionEvent event) {
                System.out.println("Hello World!");
                takeSnapShot(scene);
                
            }
        });

        root.getChildren().add(btn);

        primaryStage.setTitle("Hello World!");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
    
    private void takeSnapShot(Scene scene){
        WritableImage writableImage = 
            new WritableImage((int)scene.getWidth(), (int)scene.getHeight());
        scene.snapshot(writableImage);
        
        File file = new File("snapshot.png");
        try {
            ImageIO.write(SwingFXUtils.fromFXImage(writableImage, null), "png", file);
            System.out.println("snapshot saved: " + file.getAbsolutePath());
        } catch (IOException ex) {
            Logger.getLogger(JavaFXSnapshot.class.getName()).log(Level.SEVERE, null, ex);
        }
    }
    
}