JDK-8012586 : [x11] Modal dialogs for fullscreen window may show behind its owner
  • Type: Bug
  • Component: client-libs
  • Sub-Component: java.awt
  • Affected Version: 7
  • Priority: P4
  • Status: Resolved
  • Resolution: Fixed
  • Submitted: 2013-04-18
  • Updated: 2013-07-17
  • Resolved: 2013-04-26
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7u40Fixed 8 b89Fixed
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Relates :  
Reported at http://mail.openjdk.java.net/pipermail/awt-dev/2013-April/004619.html

I'm using in my application fullscreen mode. Since 1.6 java have a lot of
issue with it I using X11 native binding for it.
Use JNA 3.4. To going to fullscreen I send XSendEvent as _NET_WM_STATE with

You can look at test application on the github:
https://github.com/vkravets/FullScreenTest. Main Class: Main or MinTest

So about the issue... I have an issue with modal dialogs or windows which I
try to show when my main window in fullscreen mode.
>From 1.7 java is not working as expected. In 1.6 java modal dialogs/windows
appeared above fullscreen window as it should be, but in 1.7 and 1.8 all
modal dialogs/windows appeared under the fullscreen window.

I'm using wm Metacity, the same I have noticed on Gnome Shell... It seems
that it's related to all clones of Metacity...

I'm try to see how it's perform by defult native frameworks and I tested
GTK3 and SWT which is using GTK bindings. And everything is working as
expected. SmartGit which written on Java and use SWT don't have such
problem. VLC/GTK the same - in fullscreen mode I can call some dialogs
which will be appeared above fullscreen window.

It's very strange  for me that Java in own documentation have such lines:
Quote from GraphicsDevice#setFullScreenWindow:
Windows cannot overlap the full-screen window. All other application
windows will always appear beneath the full-screen window in the Z-order.

Since from 1.7 java is using the same message _NET_WM_STATE with
_NET_WM_STATE_FULLSCREEN to going to fullscreeb and is not clear why we
have such broken behavior with modal dialogs from 1.7 java and such lines
in the documentation....
Fix is contributed and being reviewed at: http://mail.openjdk.java.net/pipermail/awt-dev/2013-April/004642.html