Unable to grab jpeg from clipboard

Hi
I am trying to display a jpeg image from a clipboard in my application. However It keeps coming up with Data Flavor Unsupported exception. I have tried even creating a separate DataFlavor object of jpeg, but still its not working. Any help is appreciated.
The code that I am using is :
Graphics g = mainPanel.getGraphics();
        Image img = null;
        //DataFlavor jpegFlavor = new DataFlavor("image/jpeg","JPEG image");
        if (clipboardContents.isDataFlavorSupported(DataFlavor.imageFlavor))
        // get the system clipboard
        Clipboard systemClipboard =
                Toolkit.getDefaultToolkit().getSystemClipboard();
        // get the contents on the clipboard in a
        // Transferable object
        Transferable clipboardContents =
                systemClipboard.getContents(null);
        // check if contents are empty, if so, return null
        if (clipboardContents == null)
            img = null;
        } else
            try
                // make sure content on clipboard is
                // falls under a format supported by the
                // imageFlavor Flavor
                if (clipboardContents.isDataFlavorSupported(DataFlavor.imageFlavor))
                    // convert the Transferable object
                    // to an Image object
                    Image image =
                            (Image) clipboardContents.getTransferData(DataFlavor.imageFlavor);
                    img = image;
            } catch (UnsupportedFlavorException ufe)
                ufe.printStackTrace();
            } catch (IOException ioe)
                ioe.printStackTrace();
        g.drawImage(img, 0, 0, null);Regards.

If I comment out the IF check, then the following exception is displayed.
java.awt.datatransfer.UnsupportedFlavorException
at sun.awt.datatransfer.ClipboardTransferable.getTransferData(ClipboardTransferable.java:143)
at clipboardtesting.ClipboardTestingView.GrabActionPerformed(ClipboardTestingView.java:247)
at clipboardtesting.ClipboardTestingView.access$800(ClipboardTestingView.java:30)
at clipboardtesting.ClipboardTestingView$4.actionPerformed(ClipboardTestingView.java:130)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
at java.awt.Component.processMouseEvent(Component.java:6041)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3265)
at java.awt.Component.processEvent(Component.java:5806)
at java.awt.Container.processEvent(Container.java:2058)
at java.awt.Component.dispatchEventImpl(Component.java:4413)
at java.awt.Container.dispatchEventImpl(Container.java:2116)
at java.awt.Component.dispatchEvent(Component.java:4243)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4322)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3986)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3916)
at java.awt.Container.dispatchEventImpl(Container.java:2102)
at java.awt.Window.dispatchEventImpl(Window.java:2440)
at java.awt.Component.dispatchEvent(Component.java:4243)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)

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