Name: diC59631 Date: 12/09/98


To reproduce, start DropBug, drag the red rectangle
and drop it onto the green one, afterwards: java is "not responding".
A thread dump is included after the source.

// Source:
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.dnd.*;
import java.awt.datatransfer.*;
import javax.swing.*;

class DropBug extends JFrame
{
DropBug()
{
super("Drag red rectangle and drop it on green one");
JPanel p1 = new JPanel();
p1.setSize(100, 100);
p1.add(new DragMe());
getContentPane().add(p1);
JPanel p2 = new JPanel();
p2.add(new DropHere(p2));
p2.setSize(100, 100);
getContentPane().add(p2);
setCursor(Cursor.getPredefinedCursor(Cursor.MOVE_CURSOR));
p1.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
p2.setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
pack();
setSize(600, 400);
show();
}
public static void main(String args[])
{
new DropBug();
}
public static final DataFlavor dataFlavor = new DataFlavor(DragMe.class, "AAP");
class DragMe extends JComponent implements DragGestureListener, DragSourceListener, Transferable, Serializable
{
DragMe()
{
DragSource source = DragSource.getDefaultDragSource();
source.createDefaultDragGestureRecognizer(this, DnDConstants.ACTION_COPY, this);
}
public void dropActionChanged(DragSourceDragEvent dsde){}
public void dragEnter(DragSourceDragEvent dsde){}
public void dragOver(DragSourceDragEvent dsde){}
public void dragGestureChanged(DragSourceDragEvent dsde){}
public void dragExit(DragSourceEvent dse){}
public void dragDropEnd(DragSourceDropEvent dsde)
{
}
public void dragGestureRecognized(DragGestureEvent dge)
{
dge.startDrag(null, this, this);
}
public DataFlavor[] getTransferDataFlavors()
{
DataFlavor[] flavors = new DataFlavor[1];
flavors[0] = dataFlavor;
return flavors;
}
public boolean isDataFlavorSupported(DataFlavor flavor)
{
return flavor.equals(dataFlavor);
}
public Object getTransferData(DataFlavor flavor)
throws UnsupportedFlavorException, IOException
{
return "Aap";;
}
public Dimension getPreferredSize()
{
return new Dimension(50, 50);
}
public void paint(Graphics g)
{
Rectangle rec = getBounds();
g.setColor(Color.red);
g.fill3DRect(0, 0, rec.width, rec.height, true);
}
}
class DropHere extends JComponent implements MouseMotionListener, DropTargetListener
{
JPanel parent;
boolean ok = false;

DropHere(JPanel parent)
{
this.parent = parent;
parent.addMouseMotionListener(this);
new DropTarget(this, DnDConstants.ACTION_COPY, this, true);
}
public Dimension getPreferredSize()
{
return new Dimension(60, 60);
}
public void paint(Graphics g)
{
Rectangle rec = getBounds();
g.setColor(Color.green);
g.fill3DRect(0, 0, rec.width, rec.height, true);
}
public void mouseDragged(MouseEvent e){}
public void mouseMoved(MouseEvent e){}
public void mouseEntered(MouseEvent e){}
{
}
public void mouseExited(MouseEvent e)
{
synchronized(parent)
{
parent.setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
}
}
public void dropActionChanged(DropTargetDragEvent dtde){}
public void dragEnter(DropTargetDragEvent dtde)
{
DataFlavor flavor[] = dtde.getCurrentDataFlavors();

for (int i=0; i<flavor.length; i++)
{
if (flavor[i].equals(dataFlavor))
{
System.out.println("Accept");
dtde.acceptDrag(DnDConstants.ACTION_COPY);

return;
}
}

dtde.rejectDrag();
}
public void dragOver(DropTargetDragEvent dtde){}
public void dragScroll(DropTargetDragEvent dtde){}
public void dragExit(DropTargetEvent dte){}
public void drop(DropTargetDropEvent dtde)
{
dtde.acceptDrop(DnDConstants.ACTION_COPY);
Transferable transferable = dtde.getTransferable();
DataFlavor flavors[] = dtde.getCurrentDataFlavors();

String s =null;

try
{
for (int i = 0; i < flavors.length; i++)
{
if (flavors[i].equals(dataFlavor))
{
s = (String) transferable.getTransferData(flavors[i]);
System.out.println("Received "+s);

break;
}
}
}
catch (Throwable t)
{
}
finally
{
dtde.getDropTargetContext().dropComplete(true);
}
}
}
}

/////////


Full thread dump Classic VM (JDK-1.2-V, native threads):
    "Thread-1" (TID:0xd62f7d8, sys_thread_t:0x8d4ce0, state:R, native ID:0xcf) prio=6
at sun.awt.windows.WDragSourceContextPeer.doDragDrop(Native Method)
at sun.awt.windows.WDragSourceContextPeer$1.run(WDragSourceContextPeer.java:163)
    "Thread-0" (TID:0xd62d830, sys_thread_t:0x8cc4e0, state:CW, native ID:0xf1) prio=5
    "AWT-Windows" (TID:0xd61d108, sys_thread_t:0x888310, state:CW, native ID:0xce) prio=5
at java.lang.Object.wait(Native Method)
at java.lang.Object.wait(Compiled Code)
at javax.swing.SwingUtilities.invokeAndWait(SwingUtilities.java:1149)
at sun.awt.windows.WDragSourceContextPeerDispatcher.dispatch(Compiled Code)
at sun.awt.windows.WDragSourceContextPeerDispatcher.deliverDropFinish(WDragSourceContextPeer.java:534)
at sun.awt.windows.WDragSourceContextPeer.dragDropFinished(WDragSourceContextPeer.java:374)
at sun.awt.windows.WToolkit.eventLoop(Native Method)
at sun.awt.windows.WToolkit.run(WToolkit.java:134)
at java.lang.Thread.run(Thread.java:479)
    "SunToolkit.PostEventQueue-0" (TID:0xd61cf68, sys_thread_t:0x888180, state:CW, native ID:0xe5) prio=5
at java.lang.Object.wait(Native Method)
at java.lang.Object.wait(Compiled Code)
at sun.awt.PostEventQueue.run(SunToolkit.java:363)
    "AWT-EventQueue-0" (TID:0xd61cf98, sys_thread_t:0x887de0, state:R, native ID:0xe9) prio=6
at sun.awt.windows.WComponentPeer.setCursor(Native Method)
at java.awt.Component.setCursor(Component.java:1759)
at java.awt.LightweightDispatcher.retargetMouseEvent(Compiled Code)
at java.awt.LightweightDispatcher.trackMouseEnterExit(Compiled Code)
at java.awt.LightweightDispatcher.processMouseEvent(Compiled Code)
at java.awt.LightweightDispatcher.dispatchEvent(Compiled Code)
at java.awt.Container.dispatchEventImpl(Compiled Code)
at java.awt.Window.dispatchEventImpl(Compiled Code)
at java.awt.Component.dispatchEvent(Compiled Code)
at java.awt.EventQueue.dispatchEvent(Compiled Code)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:68)
    "Finalizer" (TID:0xd5f9320, sys_thread_t:0x820460, state:CW, native ID:0xfd) prio=8
at java.lang.Object.wait(Native Method)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:112)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:127)
at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:174)
    "Reference Handler" (TID:0xd5f93b0, sys_thread_t:0x81f800, state:CW, native ID:0xfc) prio=10
at java.lang.Object.wait(Native Method)
at java.lang.Object.wait(Object.java:424)
at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:114)
    "Signal dispatcher" (TID:0xd5f93e0, sys_thread_t:0x81edb0, state:R, native ID:0xef) prio=5
Monitor Cache Dump:
    sun.awt.windows.WDragSourceContextPeerDispatcher@D61D0A0/DA19C98: owner "AWT-Windows" (0x888310) 1 entry
    sun.awt.windows.WFramePeer@D62D660/DAC2070: owner "AWT-EventQueue-0" (0x887de0) 1 entry
    java.lang.ref.ReferenceQueue$Lock@D5F9338/D92F028: <unowned>
Waiting to be notified:
"Finalizer" (0x820460)
    sun.awt.PostEventQueue@D61CF68/DA18C00: <unowned>
Waiting to be notified:
"SunToolkit.PostEventQueue-0" (0x888180)
    javax.swing.SwingUtilities$1@D630558/DBAA640: <unowned>
Waiting to be notified:
"AWT-Windows" (0x888310)
    java.lang.ref.Reference$Lock@D5F93C0/D92EB20: <unowned>
Waiting to be notified:
"Reference Handler" (0x81f800)
    DropBug@D6098B0/D9A6C08: owner "AWT-EventQueue-0" (0x887de0) 1 entry
Registered Monitor Dump:
    SymcJIT Method Monitor: <unowned>
    SymcJIT Method Monitor: <unowned>
    SymcJIT Method List Monitor: <unowned>
    SymcJIT Lock: <unowned>
    utf8 hash table: <unowned>
    JNI pinning lock: <unowned>
    JNI global reference lock: <unowned>
    BinClass lock: <unowned>
    Class linking lock: <unowned>
    System class loader lock: <unowned>
    Code rewrite lock: <unowned>
    Heap lock: <unowned>
    Monitor cache lock: owner "Signal dispatcher" (0x81edb0) 1 entry
    Thread queue lock: owner "Signal dispatcher" (0x81edb0) 1 entry
Waiting to be notified:
(Review ID: 47638)
======================================================================

The attached sample program also failed on Win'98 on the jdk kestrel-beta
release (Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.0-J)
Roger Pham 10/12/99

Since this bug is causing the JCK regression tests to fail, I'm upgrading
it status to red.

Roger Pham 10/12/99