Drag&Drop Custom Data?

Question

Hello, my fellow JavaFXsians :)
I'm trying to implement a Drag&Drop of an Object. But, as you could guess, I'm not really successful. I'm being hit with the +"java.lang.IllegalArgumentException: Only serializable objects or ByteBuffer can be used as data with data format [model.jfxwrappers.VezaDjetetaWrapper]"+ exception. Why is this wrong:
DataFormat dataFormatVDW = new DataFormat("model.jfxwrappers.VezaDjetetaWrapper");  //A Class
myListView.setOnDragDetected(new EventHandler<MouseEvent>() {
    @Override
    public void handle(MouseEvent dragEvent) {
        Dragboard db= myListView.startDragAndDrop(TransferMode.COPY);
        ClipboardContent content= new ClipboardContent();
        content.put(dataFormatVDW, db);
        db.setContent(content);
        dragEvent.consume();
I've read that the model.jfxwrappers.VezaDjetetaWrapper has to be Serializable, so it is. What am I missing, please?

Answer 1

Oh, I'm embarrassed. :) Yes, that was the error, but now I'm having some other difficulties.
When I tried D&D after making the appropriate change suggested above, I've got some more exceptions. First it was:
java.lang.IllegalArgumentException: Could not serialize the data
     at com.sun.javafx.tk.quantum.QuantumClipboard.putContent(Unknown Source)
     at javafx.scene.input.Clipboard.setContent(Unknown Source)
     at java.lang.Thread.run(Thread.java:722)
Caused by: java.io.NotSerializableException: javafx.beans.property.SimpleObjectProperty
     at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1180)
     at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1528)
     at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1493)
     at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416)
     at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174)
     at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:346)
     ... 40 morebut then I've commented out the SimpleObjectProperty (although I've made it's value Serializable as well) and got this exception:
java.lang.IllegalArgumentException: Could not serialize the data
     at com.sun.javafx.tk.quantum.QuantumClipboard.putContent(Unknown Source)
     at javafx.scene.input.Clipboard.setContent(Unknown Source)
     at java.lang.Thread.run(Thread.java:722)
Caused by: java.io.NotSerializableException: javafx.beans.property.SimpleStringProperty
     at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1180)
     at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1528)
     at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1493)
     at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416)
     at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174)
     at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:346)
     ... 40 moreI'm using JavaFX 2.2b06 and presuming that these properties are indeed Serializable (although I couldn't find a confirmation in the API) don't know what could it be.
The only change I've made in my code listed above is this:
content.put(dataFormatVDW, vezeDjetetaList.getSelectionModel().getSelectedItem());