FULL PRODUCT VERSION :
Java(TM) SE Runtime Environment (build 1.6.0_20-b02)

ADDITIONAL OS VERSION INFORMATION :
Windows XP SP3

A DESCRIPTION OF THE PROBLEM :
The bugfix for BugID 6491273 introduced a new class: sun.print.DialogOwner to add the possibllity to set an owner for the PrintDialog via the PrintAttributeSet.
The Class however only allows to set a Frame as owner of the PrintDialog it is also possible that the owner is a Dialog itself.

The DialogOwner class is for example used in WPrinterJob class:

    private boolean displayNativeDialog()
    {
        if(attributes == null)
            return false;
        DialogOwner dialogowner = (DialogOwner)attributes.get(sun/print/DialogOwner);
        Frame frame = dialogowner == null ? null : dialogowner.getOwner();

       //The line above shows it is never possible to instanciate the WPrintdialog with a Dialog.

        WPrintDialog wprintdialog = new WPrintDialog(frame, this);
        wprintdialog.setRetVal(false);
        wprintdialog.setVisible(true);
        boolean flag = wprintdialog.getRetVal();
        wprintdialog.dispose();
        Destination destination = (Destination)attributes.get(javax/print/attribute/standard/Destination);
...
...
...
}




REPRODUCIBILITY :
This bug can be reproduced always.