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8170794: [macosx] Error when using setDesktopManager on a JDesktopPan…
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…e on MacOS X with Look and Feel Aqua

Reviewed-by: prr
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prsadhuk committed Jul 25, 2022
1 parent 80dc6ce commit d0c365a
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Showing 2 changed files with 106 additions and 1 deletion.
Original file line number Diff line number Diff line change
Expand Up @@ -1085,7 +1085,7 @@ public Image getVolatileOffscreenBuffer(Component c,

// If the window is non-opaque, it's double-buffered at peer's level
Window w = (c instanceof Window) ? (Window)c : SwingUtilities.getWindowAncestor(c);
if (!w.isOpaque()) {
if (w != null && !w.isOpaque()) {
Toolkit tk = Toolkit.getDefaultToolkit();
if ((tk instanceof SunToolkit) && (((SunToolkit)tk).needUpdateWindow())) {
return null;
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105 changes: 105 additions & 0 deletions test/jdk/javax/swing/JDesktopPane/
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@@ -0,0 +1,105 @@
* Copyright (c) 2022, Oracle and/or its affiliates. All rights reserved.
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit if you need additional information or have any
* questions.

/* @test
* @bug 8170794
* @key headful
* @summary Verifies iconifying internalframe after setting DesktopManager
* does not return NPE
* @run main TestDesktopManagerNPE

import java.awt.Dimension;
import java.awt.Robot;
import java.awt.Toolkit;
import javax.swing.DefaultDesktopManager;
import javax.swing.JInternalFrame;
import javax.swing.JDesktopPane;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuItem;
import javax.swing.JMenuBar;
import javax.swing.KeyStroke;
import javax.swing.SwingUtilities;

public class TestDesktopManagerNPE {

static JDesktopPane desktop;
static JInternalFrame internalFrame;
static JFrame frame;

//Create a new internal frame.
protected static void createFrame() {
internalFrame = new JInternalFrame();
internalFrame.setSize(300, 300);
internalFrame.setLocation(30, 30);
internalFrame.setVisible(true); //necessary as of 1.3
try {
} catch (java.beans.PropertyVetoException e) {}

* Create the GUI and show it. For thread safety,
* this method should be invoked from the
* event-dispatching thread.
private static void createAndShowGUI() {

int inset = 50;
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
frame = new JFrame("Test");
frame.setBounds(inset, inset,
screenSize.width - inset*2,
screenSize.height - inset*2);

//Set up the GUI.
desktop = new JDesktopPane(); //a specialized layered pane

// If you add this line, iconification will fail
desktop.setDesktopManager(new DefaultDesktopManager());

createFrame(); //create first "window"
//Display the window.

public static void main(String[] args) throws Exception {
try {
SwingUtilities.invokeAndWait(() -> createAndShowGUI());
Robot robot = new Robot();
} finally {
SwingUtilities.invokeAndWait(() -> {
if (frame != null) {

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