I'm getting this error running my app: ```Exceptio...

# compose-desktop

[martmists]

I'm getting this error running my app:

Exception in thread "main" java.awt.HeadlessException: 
No X11 DISPLAY variable was set,
or no headful library support was found,
but this program performed an operation which requires it,


	at java.desktop/sun.java2d.HeadlessGraphicsEnvironment.getDefaultScreenDevice(HeadlessGraphicsEnvironment.java:58)
	at androidx.compose.ui.window.LayoutConfiguration_desktopKt.getGlobalDensity(LayoutConfiguration.desktop.kt:41)
	at androidx.compose.ui.window.Application_desktopKt$awaitApplication$2$1$2$1.invoke(Application.desktop.kt:226)
	at androidx.compose.ui.window.Application_desktopKt$awaitApplication$2$1$2$1.invoke(Application.desktop.kt:221)
	at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.kt:121)

What do I do? I'm running KDE Wayland

[Thiago]

Have you a JRE Headless installed? Maybe set the headless to true. on Gradle properties or terminal -D property.

[martmists]

I don't think so, I'm just using OpenJDK 21

[Thiago]

Here the reference: https://www.oracle.com/technical-resources/articles/javase/headless.html

[martmists]

Forcibly setting headless to false: Can't connect to X11 window server using ':0.0' as the value of the DISPLAY variable.

[martmists]

I think it's caused by intellij/gradle not passing the DISPLAY env var to the desktop task?

[Johannes Gätjen]

I also recently started to encounter this issue. Same project used to work fine. I suspect it broke with some driver/system updates, because I didn't change anything with the project. Running Ubuntu 24.04