Currently, Java 21 needs to be manually installed each time the Gitpod workspace is opened as gitpod is using Java 11 by default on which the build fails. To streamline the process, the gitpod.yml file should be updated to automate the installation of Java 21. We can update the Dockerfile for the gitpod configuration - as done previously for the Design Library Plugin : https://github.com/jenkinsci/design-library-plugin/pull/373