Name: mc57594 Date: 12/07/99


Possible duplicate of 4269666
"Kestrel-FCS-E:Drag and Drop on Windows platform causes app to freeze."
[chamness]

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java version "1.3beta"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3beta-O)
Java(TM) HotSpot Client VM (build 1.3beta-O, mixed mode)

Create a component, make it a drop target, and place it on a hidden heavyweight
parent. When you go to show the frame, it hangs, taking up 100% CPU time. This
happens on 1.2.2 and 1.3beta1. Causes problems for wizard-like UI.


import java.awt.*;
import java.awt.dnd.*;
import java.awt.event.*;

public class DnDTest
{
public final static void main (String[] args)
{
Frame f = new Frame("Laucher frame");
f.setLayout(null);
f.setBounds(100,100,200,200);

Button b = new Button();
b.setBounds(50,100,120,30);
b.setLabel("Push me");
b.addActionListener(new AL());
f.add(b);

f.show();
}
}

class AL implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
Frame f = new Frame("Test frame");
f.setLayout(null);
f.setBounds(150,150,400,200);

Panel p = new Panel();
p.setBounds(0,0,400,200);
p.setVisible(false);
f.add(p);

Panel p2 = new Panel();
p2.setBounds(100,100,100,100);
new DropTarget(p2, new DTL());
p.add(p2);

f.show();
}
}

class DTL implements DropTargetListener
{
public void dragEnter(DropTargetDragEvent dtde) {}
public void dragExit(DropTargetEvent dte) {}
public void dragOver(DropTargetDragEvent dtde) {}
public void drop(DropTargetDropEvent dtde) {}
public void dropActionChanged(DropTargetDragEvent dtde) {}
}



Full thread dump:

"Thread-1" prio=5 tid=0x786100 nid=0x148 waiting on monitor [0..0x6fb64]

"AWT-Windows" prio=5 tid=0x781cd0 nid=0xfc runnable [0x934f000..0x934fddc]
        at sun.awt.windows.WToolkit.eventLoop(Native Method)
        at sun.awt.windows.WToolkit.run(WToolkit.java:145)
        at java.lang.Thread.run(Thread.java:479)

"SunToolkit.PostEventQueue-0" prio=5 tid=0x781350 nid=0x142 waiting on monitor [
0x930f000..0x930fddc]
        at java.lang.Object.wait(Native Method)
        at java.lang.Object.wait(Object.java:424)
        at sun.awt.PostEventQueue.run(SunToolkit.java:451)

"AWT-EventQueue-0" prio=7 tid=0x781100 nid=0x10c runnable [0x92cf000..0x92cfddc]

        at sun.awt.windows.WComponentPeer.show(Native Method)
        at java.awt.Component.show(Component.java:893)
        at java.awt.Window.show(Window.java:350)
        at AL.actionPerformed(DnDTest.java:42)
        at java.awt.Button.processActionEvent(Button.java:333)
        at java.awt.Button.processEvent(Button.java:306)
        at java.awt.Component.dispatchEventImpl(Component.java:2529)
        at java.awt.Component.dispatchEvent(Component.java:2443)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:302)
        at java.awt.EventDispatchThread.pumpOneEvent(EventDispatchThread.java:10
5)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:95)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:86)

"Signal Dispatcher" daemon prio=10 tid=0x776ce0 nid=0x133 waiting on monitor [0.
.0]

"Finalizer" daemon prio=9 tid=0x774550 nid=0x12b waiting on monitor [0x90af000..
0x90afddc]
        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:166)

"Reference Handler" daemon prio=10 tid=0x773d30 nid=0x162 waiting on monitor [0x
906f000..0x906fddc]
        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)

"VM Thread" prio=5 tid=0x773750 nid=0x124 runnable

"VM Periodic Task Thread" prio=10 tid=0x776970 nid=0x141 waiting on monitor
(Review ID: 97969)
======================================================================
abhijit.saha@Eng 2001-07-02
updating the bugtraq for bugs integrated in appropriate version of jdk.