Rolling release of (usually) STSs OpenJDK by openEuler Community. OpenJDK has release cadence of 6 months, but 3/4 of them are Short Term Supported for 6 months only. This package is designed to harbor them. Currently it is build of OpenJDK 18. JDK 18 will receive updates under until September 2022 when it will be superseded by JDK 19.

JDK18 is current release of Java platform. It is bringing many cool improvements - https://openjdk.java.net/projects/jdk/18/. Unluckily, this package is STS (short term support) version. Between individual LTS there will be always several STS. Again, please see announcement: http://mail.openjdk.java.net/pipermail/discuss/2017-September/004281.html. So this is rolling release of all STSs to come. Its fate during the release of fresh LTS is yet to be decided.