Name: gm110360 Date: 05/08/2002


FULL PRODUCT VERSION :
java version "1.4.0"
Java(TM) 2 Runtime Environment, Standard Edition (build 1
Java HotSpot(TM) Client VM (build 1.4.0-b92, mixed mode)

and

java version "1.3.0"
Java(TM) 2 Runtime Environment, Standard Edition (build
Java HotSpot(TM) Client VM (build 1.3.0-C, mixed mode)


FULL OPERATING SYSTEM VERSION :

Microsoft Windows 2000 [5.00.2195]

A DESCRIPTION OF THE PROBLEM :
My application cut/copy/paste feature is failing when an
attempt is made to place a (Transferable) object on the
clipboard. This used to work fine in 1.3, and began
failing when I upgraded to 1.4.


REGRESSION. Last worked in version 1.3.1

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. Run my sample program in 1.3 - it works.
2. Run the same program in 1.4 - it gets an exception when
the clipboard's setContents method is called.


EXPECTED VERSUS ACTUAL BEHAVIOR :
The program should run in 1.4.



ERROR MESSAGES/STACK TRACES THAT OCCUR :
When I run my test case program in 1.4, I get the following Exception trace:

Exception in thread "main" java.lang.NullPointerException
        at sun.awt.datatransfer.DataTransferer.getFormatsForFlavors(DataTransfer
er.java:719)
        at sun.awt.windows.WDataTransferer.getFormatsForFlavors(WDataTransferer.
java:127)
        at sun.awt.datatransfer.DataTransferer.getFormatsForTransferable(DataTra
nsferer.java:687)
        at sun.awt.windows.WClipboard.setContents(WClipboard.java:63)
        at CBTest.main(CBTest.java:10)


In my application, the setContents method also fails, but gives a different
excetption trace:

java.lang.ClassCastException: java.lang.Object
at sun.awt.datatransfer.DataTransferer.translateTransferable
(DataTransferer.java:1214)
at sun.awt.windows.WDataTransferer.translateTransferable
(WDataTransferer.java:144)
at sun.awt.windows.WClipboard.setContents(WClipboard.java:75)


This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.awt.datatransfer.*;
import java.awt.*;
import javax.swing.*;

public class CBTest {

public static void main(String[] args) {

TransferableSample transferableSample = new TransferableSample
();
Toolkit.getDefaultToolkit().getSystemClipboard().setContents
(transferableSample,transferableSample);
System.out.println("Success");

   }

static public class TransferableSample implements Transferable, ClipboardOwner {

public DataFlavor imageFlavor;
private DataFlavor [] supportedFlavors = {imageFlavor};
private Image picture ;

public TransferableSample () {

    picture = new ImageIcon("wo.gif").getImage();

    try {
    imageFlavor = new DataFlavor (Class.forName
("java.awt.Image"), "Image");
         }
        catch (ClassNotFoundException e) {
    e.printStackTrace ();
    }

    }
   
    public synchronized DataFlavor [] getTransferDataFlavors () {
 
    return (supportedFlavors);
   
    }
   
    public boolean isDataFlavorSupported (DataFlavor parFlavor) {
   
    return (parFlavor.equals (imageFlavor));
   
    }
   
    public synchronized Object getTransferData (DataFlavor parFlavor)
    throws UnsupportedFlavorException {
    if (parFlavor.equals (imageFlavor))
    return (picture);
    else
    throw new UnsupportedFlavorException (imageFlavor);
   
    }
   
    public void lostOwnership (Clipboard parClipboard, Transferable
parTransferable) {
   
        System.out.println ("Lost ownership");

}
}
}
---------- END SOURCE ----------

Release Regression From : 1.3.0_05
The above release value was the last known release where this
bug was known to work. Since then there has been a regression.

(Review ID: 146336)
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