I'd like to re-iterate that Wayland is not a supported platform for ANY version of JDK.
It is known "not to work" - I suggest you use X.org, not Wayland.
And when we do get to support Wayland it will be on a VERY recent Linux platform. As a minimum it will probably require Gnome 45  - which isn't even available for another few months and only
in distros some time after that.
We even go to the trouble in the Oracle JDK supported platform matrix of explicitly calling out Wayland mode as not supported.

I don't really know if Wayland is the actual problem here, I just know it is unsupported

If X.org cures the problems, then you have your answer
If you can reproduce your problems on X.org then that is a much more certain base for debugging your actual issue which seems likely to a display configuration issue for which I can believe there are issues depending on h/w, video driver, JDK version etc.

But definitely JDK 11u is VERY OLD and you'll keep getting hints to upgrade to the latest (JDK20).

So that's my gentle hint as to what direction you should take - but be informed that these lists are not a support forum. They are lists exclusively for people contributing fixes to the JDK itself, so you can't expect everyone to jump on finding a solution for you,
especially on an old and relatively obscure configuration.

-phil

On 6/9/23 10:18 AM, Martin Petzold wrote:
Am 09.06.23 um 15:47 schrieb Aleksei Ivanov:
If it is a full-screen JFrame, you can exit full-screen mode and enter it again. It may help.

Thanks, I can restore the size with your suggestion: I'm now using a scheduled executor service to check size and if it is not full screen remove full screen and set full screen window again. However, the Window does not show - it is not rendered. I tried setVisible(true) again, but no effect.

Martin


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