FULL PRODUCT VERSION :
java version  " 1.7.0_13 " 
Java(TM) SE Runtime Environment (build 1.7.0_13-b20)
Java HotSpot(TM) 64-Bit Server VM (build 23.7-b01, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Mac OS X 10.7.5

EXTRA RELEVANT SYSTEM CONFIGURATION :
Processor  2.5 GHz Intel Core i5
Memory  8 GB 1333 MHz DDR3
Graphics  AMD Radeon HD 6630M 256 MB
Software  Mac OS X Lion 10.7.5 (11G63)

A DESCRIPTION OF THE PROBLEM :
A new window is created when the user does an app-switch while the native print dialog is showing in Java app.

REGRESSION.  Last worked in version 6u31

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
compile and run the attached test case.
In the UI click the  " Print Dialog "  button. This will show the native print dialog.
now switch to a different app using cmd+Tab or mouse.
switch back to the app.
notice the print dialog did not get focus, instead a new window is created at the top left corner of the screen.
This window does not disappear after the print dialog is closed.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Print dialog gets focus
ACTUAL -
A new window is created at the top-left corner of the screen, which gets the focus. Print dialog is not in focus.The new window will stay even after the print dialog is closed.

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------

import javax.swing.SwingUtilities;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.print.PrinterJob;
import javax.print.attribute.HashPrintRequestAttributeSet;
import javax.print.attribute.PrintRequestAttributeSet;
import javax.print.attribute.standard.DialogTypeSelection;
import javax.swing.JButton;
import javax.swing.JFrame;

public class PrintDialogTestCase extends JFrame {

public PrintDialogTestCase() {
        this.setTitle( " Example " );
        this.setSize(200, 100);
        this.setLocationRelativeTo(null);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                
        this.setLayout(new FlowLayout());
        JButton printDialogButton = new JButton( " Print Dialog " );
        printDialogButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent event) {
                final PrintRequestAttributeSet attributes = new HashPrintRequestAttributeSet();
                attributes.add(DialogTypeSelection.NATIVE);
                PrinterJob printJob = PrinterJob.getPrinterJob();
                printJob.printDialog(attributes);

            }
        });
        this.add(printDialogButton);
        
        JButton exitButton = new JButton( " Exit " );
        exitButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent event) {
                System.exit(0);
            }
        });
        this.add(exitButton);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                PrintDialogTestCase window = new PrintDialogTestCase();
                window.setVisible(true);
            }
        });

    }
}

---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
None, if you want to use the native print dialogs in your app. Windows.getWindows does not list this new window.