---
prelude: >
  JDK8 is soon going to be EOL by Mar 31, 2022. with most of the LF projects
  already using JDK11 (LTS), upgrade default version to JDK11 (LTS).
upgrade:
  - |
    Upgrade default version to JDK11 (LTS).

    https://www.oracle.com/java/technologies/java-se-support-roadmap.html