Java doesn't yet (fully/at all) support Wayland. So you've got to install XServer/X11/Xwayland.
What java version are you using? java -version
Might require a different java version. I've found some bugtracker that wayland support is in progress but I can't test it myself (still on XServer).
stackoverflow.com/questions/39197208/java-gui-support-on-wayland
github.com/swaywm/sway/wiki/Running-programs-natively-under-wayland
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JD-Dev & Server-Admin
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