I just switched from 2.1 GA to 2.2 beta b15 and noticed that some things that worked in 2.1 don't work any longer in 2.2:

I have a ListView and a TreeView with Drag & Drop. I transport my own data format. On drag detected I put the new data format in the drag board.

On drag entered I ask the drag board if it contains "my" data format. If yes, I want to do stuff.

In the dragentered I get the following exception:

java.lang.IllegalArgumentException: DataFormat 'contactEntry' already exists.
at javafx.scene.input.DataFormat.<init>(Unknown Source)
TestApp5$1$3.handle(TestApp5.java:85)
TestApp5$1$3.handle(TestApp5.java:82)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(Unknown Source)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(Unknown Source)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at com.sun.javafx.event.EventUtil.fireEventImpl(Unknown Source)
at com.sun.javafx.event.EventUtil.fireEvent(Unknown Source)
at javafx.event.Event.fireEvent(Unknown Source)
at javafx.scene.Scene$DnDGesture.handleExitEnter(Unknown Source)
at javafx.scene.Scene$DnDGesture.processTargetEnterOver(Unknown Source)
at javafx.scene.Scene$DnDGesture.access$6100(Unknown Source)
at javafx.scene.Scene$DropTargetListener.dragEnter(Unknown Source)
at com.sun.javafx.tk.quantum.GlassSceneDnDEventHandler.handleDragEnter(Unknown Source)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleDragEnter(Unknown Source)
at com.sun.glass.ui.View.handleDragEnter(Unknown Source)
at com.sun.glass.ui.View.notifyDragEnter(Unknown Source)
at com.sun.glass.ui.win.WinDnDClipboard.push(Native Method)
at com.sun.glass.ui.win.WinSystemClipboard.pushToSystem(Unknown Source)
at com.sun.glass.ui.SystemClipboard.flush(Unknown Source)
at com.sun.glass.ui.ClipboardAssistance.flush(Unknown Source)
at com.sun.javafx.tk.quantum.QuantumClipboard.flush(Unknown Source)
at com.sun.javafx.tk.quantum.QuantumToolkit.startDrag(Unknown Source)
at javafx.scene.Scene$DnDGesture.dragDetectedProcessed(Unknown Source)
at javafx.scene.Scene$DnDGesture.process(Unknown Source)
at javafx.scene.Scene$DnDGesture.access$8700(Unknown Source)
at javafx.scene.Scene$MouseHandler.process(Unknown Source)
at javafx.scene.Scene$MouseHandler.process(Unknown Source)
at javafx.scene.Scene$MouseHandler.access$1900(Unknown Source)
at javafx.scene.Scene.impl_processMouseEvent(Unknown Source)
at javafx.scene.Scene$ScenePeerListener.mouseEvent(Unknown Source)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(Unknown Source)
at com.sun.glass.ui.View.handleMouseEvent(Unknown Source)
at com.sun.glass.ui.View.notifyMouse(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)


I also get a COM ERROR 80de0001 in CallbackToJava(javaIDs.View.notifyDragEnter, grfKeyState, pt, pdwEffect)

In some cases this error event causes my application to terminate!

(I can't copy&paste it here completely due to some strange characters)


TEST CASE (drag a listcell over another one):

import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.ListCell;
import javafx.scene.control.ListView;
import javafx.scene.input.*;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
import javafx.util.Callback;

import java.util.HashMap;
import java.util.Map;


public class TestApp5 extends Application {


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

    public void start(final Stage stage) throws Exception {

        VBox root = new VBox();

        ListView<String> listView = new ListView<String>();

        listView.setCellFactory(new Callback<ListView<String>, ListCell<String>>() {
            @Override
            public ListCell<String> call(ListView<String> stringListView) {

                final ListCell<String> listCell = new ListCell<String>() {

                    protected void updateItem(String item, boolean empty) {
                        super.updateItem(item, empty);
                        if (item != null) {
                            setText(item);
                        }
                    }

                };

                listCell.setOnDragDetected(new EventHandler<MouseEvent>() {
                    @Override
                    public void handle(MouseEvent mouseEvent) {
                        Dragboard db;
                            try {
                                db = listCell.startDragAndDrop(TransferMode.MOVE);

                                String[] contactEntryInfo = new String[2];
                                contactEntryInfo[0] = "Some data";
                                contactEntryInfo[1] = "I want to drag";

                                DataFormat dataFormat = new DataFormat("contactEntry");
                                Map<DataFormat, Object> map = new HashMap<DataFormat, Object>();
                                map.put(dataFormat, contactEntryInfo);

                                db.setContent(map);
                                mouseEvent.consume();
                            } catch (Exception e) {
                                //e.printStackTrace();
                            }
                    }
                });

                listCell.setOnDragEntered(new EventHandler<DragEvent>() {
                    @Override
                    public void handle(DragEvent dragEvent) {
                        if (dragEvent.getDragboard().hasContent(new DataFormat("contactEntry")))
                        {
                            // add some CSS class, so that the user knows that he can drop.
                        }
                    }
                });

                return listCell;
            }
        });

        listView.setItems(FXCollections.observableArrayList("Test1", "Test2"));
        root.getChildren().add(listView);

        Scene scene = new Scene(root);
        stage.setScene(scene);

        stage.show();
    }
}