FULL PRODUCT VERSION :
1.8.0_92, 1.7.0_55

ADDITIONAL OS VERSION INFORMATION :
OS X El Capitan
10.11.4

A DESCRIPTION OF THE PROBLEM :
Modal dialog is shown behind non-modal dialog (parent) if owning frame is in a full screen mode

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Show a frame.
Switch it into a full screen mode
Open non-modal dialog
Open another modal dialog


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Last modal dialog is on top of owning non-modal dialog
ACTUAL -
Last modal dialog is hidden under owning non-modal dialog

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import com.apple.eawt.FullScreenUtilities;

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;

public class TestFrame extends JFrame
{
public TestFrame() throws HeadlessException
{
super("Test Frame");
setDefaultCloseOperation(DISPOSE_ON_CLOSE);
setSize(500, 500);
FullScreenUtilities.setWindowCanFullScreen(this, true);

Container contentPane = getContentPane();
contentPane.setLayout(new FlowLayout());
contentPane.add(new JButton(new AbstractAction("Open non-modal dialog")
{
@Override
public void actionPerformed(ActionEvent e)
{
new NonModalDialog(TestFrame.this).setVisible(true);
}
}));

}

public static void main(String args[])
{
new TestFrame().setVisible(true);
}

private static class NonModalDialog extends JDialog
{
public NonModalDialog(Window parent)
{
super(parent, "Non-modal");
setDefaultCloseOperation(DISPOSE_ON_CLOSE);
setSize(200, 200);

Container contentPane = getContentPane();
contentPane.setLayout(new FlowLayout());
contentPane.add(new JButton(new AbstractAction("Open modal dialog")
{
@Override
public void actionPerformed(ActionEvent e)
{
new ModalDialog(NonModalDialog.this).setVisible(true);
}
}));
}
}

private static class ModalDialog extends JDialog
{
public ModalDialog(Window parent)
{
super(parent, "Modal");
setDefaultCloseOperation(DISPOSE_ON_CLOSE);
setSize(200, 200);
}
}
}

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