JavaFX application on KDE Wayland - tiny

[Kevin Rushforth]

Another workaround is to set the "GDK_SCALE" environment variable, for 
example:

export GDK_SCALE=2

I found the following enhancement request in our bug backlog requesting 
automatic detection of the screen scale:

https://bugs.openjdk.org/browse/JDK-8238077

I changed the title to be more reflective of this and reassigned the 
bug. It's something that we could consider implementing if it isn't too 
difficult.

-- Kevin


On 11/21/2025 11:33 AM, Christopher Schnick wrote:
> You are probably looking for glass.gtk.uiScale
>
> I think I reported a while ago that the automatic scale detection for 
> KDE is not working, but apparently there wasn't an easy API 
> replacement available.
>
> On 21/11/2025 18:15, Chad Preisler wrote:
>> Hello,
>>
>> When I run my JavaFX (using JFX25) application on KDE Plasma using 
>> Wayland the fonts are incredibly small. How can I scale the 
>> application so that things are not so tiny?
>>
>> FYI: I had a similar issue with Netbeans. I know it's different 
>> because it is Swing. I was able to get Netbeans to look good with the 
>> following settings.
>>
>> -J-Dsun.java2d.uiScale=2 -J-Dflatlaf.uiScale=0.75
>>
>> Is there something similar I can do for JavaFX?
>>
>> Thanks,
>> Chad
>>
>>