Package of LTS OpenJDK 17 OpenJDK have release cadence of 6 months. but 3/4 of them are Short Term Supported for 6 months only.
JDK17 is last LTS release of Java platform. It is bringing many cool improvements - http://openjdk.java.net/projects/jdk/17/ and is landing to your Fedora. Where it will be maintained for several years. You will always be allowed to install Used LTSs in build root, and alongside via alternatives.
See announcement: http://mail.openjdk.java.net/pipermail/discuss/2017-September/004281.html See java SIG plans: https://jvanek.fedorapeople.org/devconf/2018/changesInjavaReleaseProcess.pdf
https://fedoraproject.org/wiki/Changes/Java17 https://fedoraproject.org/wiki/Changes/java-11-openjdk-TechPreview