Image Drag'n'Drop error

Question

Hello
so... he is the deal:
based on that: http://java-buddy.blogspot.com/2012/03/javafx-20-implement-gesturetarget-of.html i made some simple app that loads pictures from files.
whats important about this is this:
HBox targetBox = new HBox();and this
targetBox.getChildren().add(dbImageView);now. this works. but if i use fxml file, i cant force it to do its job.
HBox was added to the scene using scene builder and it looks like this:
<HBox id="hBox1" fx:id="targetBox" layoutX="14.0" layoutY="14.0" prefHeight="221.0" prefWidth="544.0" />and then in my main class, extending Application am trying to do this:
@FXML HBox hBox1; or @FXML HBox targetBox; (tried both ways)then
    @Override
    public void start(Stage stage) throws Exception {
        Parent root = FXMLLoader.load(getClass().getResource("sceneBuilder.fxml"));
        Scene scene = new Scene(root);
        setupGestureTarget(scene, hBox1); //taken from tutorial mentioned above
        stage.setScene(scene);
        stage.show();
    }it runs, i try to drag some image from explorer folder into the scene and BANG
onDragDropped
java.lang.NullPointerException
     at mzlike.MZlike$2.handle(MZlike.java:79)
     at mzlike.MZlike$2.handle(MZlike.java:64)
     at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(Unknown Source)
     at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source)
     at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source)
     at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(Unknown Source)
     at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
     at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
     at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
     at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
     at com.sun.javafx.event.EventUtil.fireEventImpl(Unknown Source)
     at com.sun.javafx.event.EventUtil.fireEvent(Unknown Source)
     at javafx.event.Event.fireEvent(Unknown Source)
     at javafx.scene.Scene$DnDGesture.fireEvent(Unknown Source)
     at javafx.scene.Scene$DnDGesture.processTargetDrop(Unknown Source)
     at javafx.scene.Scene$DnDGesture.access$4300(Unknown Source)
     at javafx.scene.Scene$DropTargetListener.drop(Unknown Source)
     at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleDragDrop(Unknown Source)
     at com.sun.glass.ui.View.handleDragDrop(Unknown Source)
     at com.sun.glass.ui.View.notifyDragDrop(Unknown Source)
     at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
     at com.sun.glass.ui.win.WinApplication.access$100(Unknown Source)
     at com.sun.glass.ui.win.WinApplication$2$1.run(Unknown Source)
     at java.lang.Thread.run(Thread.java:722)
Exception in thread "JavaFX Application Thread" Ewhere 79 line is targetBox.getChildren().add(dbImageView);i can upload my whole project somewhere, if you guys want.
i'd really be thankful for any help
best regards

Answer 1

ok so i did something like this:
public class Sample implements Initializable {
    @FXML HBox hBox1;
    @FXML
    private void handleButtonAction(ActionEvent event) {
        System.out.println("You clicked me!");
        if(event.getSource() instanceof MenuItem){
            System.out.println("Source is MenuItem");
            MenuItem source = (MenuItem) event.getSource();
            System.out.println("Source text is = " + source.getText());
        //label.setText("Hello World!");
    @Override
    public void initialize(URL url, ResourceBundle rb) {
        // TODO
        setupGestureTarget(hBox1);
    void setupGestureTarget(final HBox targetBox){
        targetBox.setOnDragOver(new EventHandler <DragEvent>() {
            @Override
            public void handle(DragEvent event) {
                /* data is dragged over the target */
                System.out.println("onDragOver");
                Dragboard db = event.getDragboard();
                if(db.hasFiles()){
                    event.acceptTransferModes(TransferMode.ANY);
                event.consume();
        targetBox.setOnDragDropped(new EventHandler <DragEvent>() {
            @Override
            public void handle(DragEvent event) {
                /* data dropped */
                System.out.println("onDragDropped");
                Dragboard db = event.getDragboard();
                if(db.hasFiles()){
                    for(File file:db.getFiles()){
                        String absolutePath = file.getAbsolutePath();
                        Image dbimage = new Image(absolutePath);
                        ImageView dbImageView = new ImageView();
                        dbImageView.setImage(dbimage);
                        targetBox.getChildren().add(dbImageView);
                    event.setDropCompleted(true);
                }else{
                    event.setDropCompleted(false);
                event.consume();
}and this is the outcome
May 17, 2012 11:27:41 AM javafx.fxml.FXMLLoader logException
SEVERE: java.lang.NullPointerException
/C:/test_workspace/NetBeans/MZlike/build/classes/mzlike/sceneBuilder.fxml:-1
  at mzlike.Sample.setupGestureTarget(Sample.java:61)
  at mzlike.Sample.initialize(Sample.java:56)
  at javafx.fxml.FXMLLoader.load(Unknown Source)where line 61 is
        targetBox.setOnDragOver(new EventHandler <DragEvent>() Edited by: Radosław on 2012-05-17 02:46