JRuby support has been removed from the Stapler web framework used in Jenkins core. Plugins written in JRuby and Jython have not been distributed by update ...

Jenkins LTS Upgrade Guide · Security Advisories · 2024-03-20 security advisory

Distribution of jenkins.war has been suspended ... Scalability: Fix performance issues in the XML unmarshalling code. ... "Installing slave as Windows service" ...

Quoting Issue with JDK Installer with Windows Slave (issue 5408); /about no longer shows third-party licenses (issue 17724); Failed to instantiate class ...