Crash at start-up on Linux

[6XGate]

I am unable to run Korge project on Linux after rebooting, it results in the following error:

Authorization required, but no authorization protocol specified

Exception in thread "main" java.awt.AWTError: Can't connect to X11 window server using ':0' as the value of the DISPLAY variable.
	at java.desktop/sun.awt.X11GraphicsEnvironment.initDisplay(Native Method)
	at java.desktop/sun.awt.X11GraphicsEnvironment$1.run(X11GraphicsEnvironment.java:108)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:319)
	at java.desktop/sun.awt.X11GraphicsEnvironment.initStatic(X11GraphicsEnvironment.java:63)
	at java.desktop/sun.awt.X11GraphicsEnvironment.<clinit>(X11GraphicsEnvironment.java:58)
	at java.desktop/sun.awt.PlatformGraphicsInfo.createGE(PlatformGraphicsInfo.java:68)
	at java.desktop/java.awt.GraphicsEnvironment$LocalGE.createGE(GraphicsEnvironment.java:104)
	at java.desktop/java.awt.GraphicsEnvironment$LocalGE.<clinit>(GraphicsEnvironment.java:89)
	at java.desktop/java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvironment.java:117)
	at java.desktop/java.awt.Window.initGC(Window.java:513)
	at java.desktop/java.awt.Window.init(Window.java:533)
	at java.desktop/java.awt.Window.<init>(Window.java:575)
	at java.desktop/java.awt.Frame.<init>(Frame.java:428)
	at java.desktop/javax.swing.JFrame.<init>(JFrame.java:224)
	at korlibs.render.awt.AwtGameWindow$frame$1.<init>(AwtGameWindow.kt:20)
	at korlibs.render.awt.AwtGameWindow.<init>(AwtGameWindow.kt:20)
	at korlibs.render.DefaultGameWindowJvmKt.CreateDefaultGameWindow(DefaultGameWindowJvm.kt:8)
	at korlibs.korge.KorgeRunner.invoke(Korge.kt:197)
	at korlibs.korge.KorgeRunner$invoke$1.invokeSuspend(Korge.kt)
	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
	at kotlinx.coroutines.internal.DispatchedContinuationKt.resumeCancellableWith(DispatchedContinuation.kt:263)
	at kotlinx.coroutines.DispatchedCoroutine.afterResume(Builders.common.kt:255)
	at kotlinx.coroutines.AbstractCoroutine.resumeWith(AbstractCoroutine.kt:100)
	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:46)
	at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:101)
	at kotlinx.coroutines.internal.LimitedDispatcher$Worker.run(LimitedDispatcher.kt:113)
	at kotlinx.coroutines.scheduling.TaskImpl.run(Tasks.kt:89)
	at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:589)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:823)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:720)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:707)

This occurs on Arch Linux and it randomly will work fine again, then refuse to launch.

I have check that the X authentication env is present. This is the only JVM application that exhibits this issue as far as I've encountered.

KorGE Forge 2025.2.1.1 (Fenix Edition)
Build #KF-252.25557.SNAPSHOT, built on September 6, 2025 at 06:35
Source revision: 917b28f78c531
Runtime version: 21.0.8+9-b1038.71 amd64 (JCEF 122.1.9)
VM: OpenJDK 64-Bit Server VM by JetBrains s.r.o.
Toolkit: sun.awt.X11.XToolkit
Linux 6.18.7-arch1-1
Arch Linux; glibc: 2.42
GC: G1 Young Generation, G1 Concurrent GC, G1 Old Generation
Memory: 8192M
Cores: 12
Registry:
  ide.experimental.ui=true
Non-Bundled Plugins:
  com.intellij.plugins.vscodekeymap (252.23892.201)
  com.nbadal.ktlint (0.30.2)
  com.github.copilot (1.5.63-243)
Kotlin: 252.25557.20250906-IJ
Current Desktop: KDE

[6XGate]

So upon further investigation, I determined that my X server under my DE is running on display :1. Strangely, launching the Gradle runJvmAutoreload task in KorGE Forge showed it was being given :0 via the environment; seen using println(System.getenv("DISPLAY")) in fun main. KorGE Forge though was seeing it as :1 in every setting I checked, as it should be. Even more bizarre, launching from the terminal works fine and it sees :1. I managed to fix whatever was going on by attempting to run the preview from the Korge Preview tool window. Somehow that fixed whatever was caching? the value.

If it helps, this was happening under the Wayland sessions of both GNOME 49.2 and KDE 6.5.5.

Other information:

• Project based on the Hello World project.
• Still using the same Gradle and Kotlin settings (8.8 and 2.0)
• Project is set to use the JetBrains Runtime v21.