According to https://www.oracle.com/java/technologies/javase/jdk-faqs.html Java 17 is again available under a pretty open license. Unfortunately the warning in https://github.com/jenkinsci/jdk-tool-plugin/blob/1b32b6caf9cafdabcabcce1d9199502543608bc3/src/main/resources/hudson/tools/JDKInstaller/config.jelly#L52 still lists all JDKs above 11 incorrectly as not available for free.

In addition the installer only provides versions from https://github.com/jenkins-infra/crawler/blob/08c68c085ab7151aaf703c28ac44114071cda9e5/jdk.groovy#L31 which is the hardcoded list from https://github.com/jenkins-infra/crawler/blob/master/jdk.hack.json

This hardcoded list should be removed to allow downloading/installing newer Oracle JDK versions.