Why does Java resize a Window to 1x1 pixel when HDMI is unplugged (and does not resize back when HDMI is plugged)

[Kevin Rushforth]

Specific technical questions like this should be redirected to the 
appropriate area-specific mailing list [1], client-libs-dev at openjdk.org 
in this case. I'll reply there.

-- Kevin

[1] https://openjdk.org/guide/#area-mailing-lists


On 6/9/2023 2:32 AM, Martin Petzold wrote:
>
> I have a Java application running on:
>
> XWayland 2:1.20.11-1+deb11u6, Weston 9.0.0-1, OpenJDK 
> 11.0.18+10-1~deb11u1, Debian 11, Kernel 5.10.52
>
> My JFrame (Window) is set 
> to:|GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice().setFullScreenWindow(this);|
>
> I can then see my interface on the full screen (in my case it is a TV 
> and I have CEC enabled in the Kernel). However, after I unplug HDMI 
> and plug HDMI again, my interface is gone (black screen). There is 
> only one small 1x1 pixel left. It seems the size of the Window is 
> changed by Java / XWayland / (Weston). I am sure, that I am not 
> changing it - I check all resize methods on JFrame.
>
> When I restart my Java application, it is back again - so it is not an 
> issue of the OS (Linux) directly and also - most probably - not Weston.
>
> I also don't have this issue with a pure Wayland application (e.g. 
> Weston flower). Using only Wayland (without Java and XWayland) things 
> work.
>
> When I PLUG the HDMI there is NO java.awt.event.ComponentEvent
>
> When I UNPLUG HDMI, I get the following java.awt.event.ComponentEvent:
>
> |java.awt.event.ComponentEvent[COMPONENT_RESIZED (0,0 1x1)] on frame0 
> java.base/java.lang.Thread.getStackTrace(Thread.java:1602) 
> java.desktop/java.awt.AWTEventMulticaster.componentResized(AWTEventMulticaster.java:167) 
> java.desktop/java.awt.AWTEventMulticaster.componentResized(AWTEventMulticaster.java:167) 
> java.desktop/java.awt.Component.processComponentEvent(Component.java:6461) 
> java.desktop/java.awt.Component.processEvent(Component.java:6415) 
> java.desktop/java.awt.Container.processEvent(Container.java:2263) 
> java.desktop/java.awt.Window.processEvent(Window.java:2049) 
> java.desktop/java.awt.Component.dispatchEventImpl(Component.java:5011) 
> java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2321) 
> java.desktop/java.awt.Window.dispatchEventImpl(Window.java:2772) 
> java.desktop/java.awt.Component.dispatchEvent(Component.java:4843) 
> java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:772) 
> java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721) 
> java.desktop/java.awt.EventQueue$4.run(EventQueue.java:715) 
> java.base/java.security.AccessController.doPrivileged(Native Method) 
> java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85) 
> java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:95) 
> java.desktop/java.awt.EventQueue$5.run(EventQueue.java:745) 
> java.desktop/java.awt.EventQueue$5.run(EventQueue.java:743) 
> java.base/java.security.AccessController.doPrivileged(Native Method) 
> java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85) 
> java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:742) 
> java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203) 
> java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124) 
> java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113) 
> java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109) 
> java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101) 
> java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90) 
> |
>
> Unfortunately I also don't know how to manipulate the size after I 
> catched this event. I tried to directly set the size back, but this 
> did not work. I think it may don't work because at this time HDMI is 
> UNPLUGGED. Also, if I try to set the size back to normal once the HDMI 
> is plugged again, it does not work. I get overruled and the size is 
> then back to 1x1 pixel.
>
> As I don't get any event when the HDMI is PLUGGED again, I also don't 
> know when to (try to) set the size back to "normal".
>
>
> Thanks,
>
>
> Martin
>
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