Hello - We have been asked to update our Windows node server to Java 11, currently running java 1.8, and were hoping for any guidance on where to begin or how to best go about making this update.
Thank you-
Login to windows server, stop the service, uninstall JDK 8, download and install JDK 11 then start the service. You Jenkins version should be at least 2.357.
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Hello @randomkoala757 and welcome to this community 
You may want to have a look to this guide too: Upgrading Jenkins Java version from 8 to 11 .