Problem with Wayland - Ubuntu 24.04

[username02]

As the title said, game won't start anymore since last update a few months ago

Terminal output:

~$ /bin/sh "/opt/illarion/illarion" %U

(java:24204): Gdk-CRITICAL **: 22:53:17.877: gdk_x11_display_set_window_scale: assertion 'GDK_IS_X11_DISPLAY (display)' failed
#
# A fatal error has been detected by the Java Runtime Environment:
#
#  SIGSEGV (0xb) at pc=0x0000000000000003, pid=24204, tid=0x000075c6793cb6c0
#
# JRE version: OpenJDK Runtime Environment (8.0_452-b11) (build 1.8.0_452-b11)
# Java VM: OpenJDK 64-Bit Server VM (25.452-b11 mixed mode linux-amd64 compressed oops)
# Problematic frame:
# C  0x0000000000000003
#
# Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
#
# An error report file with more information is saved as:
# /tmp/hs_err_pid24204.log
#
# If you would like to submit a bug report, please visit:
#   https://bell-sw.com/support
# The crash happened outside the Java Virtual Machine in native code.
# See problematic frame for where to report the bug.
#
Annullato (core dump creato)

[.. and Java crashes]

Problem might be solved using X11:

~$ env GDK_BACKEND=x11 /bin/sh "/opt/illarion/illarion" %U

This way everything works as it used to.

I'm writing now because this workaround won't be possible anymore using Ubuntu 26.04 / Gnome 50 because X11 sessions won't be allowed anymore.

[voidowl-rl]

Thanks for the heads-up.
The graphics framework we are using is in the process of adding stable wayland support. I will add it once that can be done without breaking x11 support on the other hand.