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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