jdk-openjdk was updated to java 22 on 2024-04-17, but JOSM doesn't work on that, I got SIGSEGV errors and josm collapsed when I opened some dialogs
Removed jdk-openjdk and installed jdk21-openjdk instead, and now everything works.
In the docs they recommend only running josm on LTS java releases. Java 21 is an LTS release, the next LTS will be java 25, it will be released in 2025.
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