Name: auR10023 Date: 12/22/2000


  
Method javax.swing.TransferHandler.exportAsDrag(JComponent, InputEvent, int) throws
unexpected NullPointerException.
Here is the example:
  
--------Test.java----------
public class Test{
    public static void main(String [] args) {
        TestComp c = new TestComp();
        TransferHandler testHandler = new TransferHandler("stringProperty");
        c.setTransferHandler(testHandler);
        testHandler.exportAsDrag(
            c,
            new MouseEvent (c,
                MouseEvent.MOUSE_CLICKED,
                (new Date()).getTime(),
                0, 0, 0, 1, false),
            TransferHandler.COPY);
    }
}
  
-------TestComp.java-------
public class TestComp extends javax.swing.JComponent implements java.io.Serializable {
    private String stringProperty = "val";
    public void setStringProperty(String val) {
        stringProperty = val;
    }
    public String getStringProperty() {
        return stringProperty;
    }
}

-------output----------
java.lang.NullPointerException
        at sun.awt.motif.MDragSourceContextPeer.startDrag(MDragSourceContextPeer.java:63)
        at sun.awt.dnd.SunDragSourceContextPeer.startDrag(SunDragSourceContextPeer.java:96)
        at java.awt.dnd.DragSource.startDrag(DragSource.java:263)
        at java.awt.dnd.DragSource.startDrag(DragSource.java:366)
        at java.awt.dnd.DragGestureEvent.startDrag(DragGestureEvent.java:187)
        at javax.swing.TransferHandler$DragHandler.dragGestureRecognized(TransferHandler.java:601)
        at java.awt.dnd.DragGestureRecognizer.fireDragGestureRecognized(DragGestureRecognizer.java:335)
        at javax.swing.TransferHandler$SwingDragGestureRecognizer.gestured(TransferHandler.java:653)
        at javax.swing.TransferHandler.exportAsDrag(TransferHandler.java:130)
        at Test.main(Test.java:11)
Exception in thread "main" java.awt.dnd.InvalidDnDOperationException: failed to create native peer
        at sun.awt.motif.MDragSourceContextPeer.startDrag(MDragSourceContextPeer.java:75)
        at sun.awt.dnd.SunDragSourceContextPeer.startDrag(SunDragSourceContextPeer.java:96)
        at java.awt.dnd.DragSource.startDrag(DragSource.java:263)
        at java.awt.dnd.DragSource.startDrag(DragSource.java:366)
        at java.awt.dnd.DragGestureEvent.startDrag(DragGestureEvent.java:187)
        at javax.swing.TransferHandler$DragHandler.dragGestureRecognized(TransferHandler.java:601)
        at java.awt.dnd.DragGestureRecognizer.fireDragGestureRecognized(DragGestureRecognizer.java:335)
        at javax.swing.TransferHandler$SwingDragGestureRecognizer.gestured(TransferHandler.java:653)
        at javax.swing.TransferHandler.exportAsDrag(TransferHandler.java:130)
        at Test.main(Test.java:11)


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