travis needs currently openjdk8 to function
travis needs currently openjdk8 to function

"Pre-installed JVMs: openjdk8, openjdk10, and openjdk11 on x86"
sources:
https://docs.travis-ci.com/user/reference/xenial/#jvm-clojure-groovy-java-scala-support
https://travis-ci.community/t/install-of-oracle-jdk-8-failing/3038/8
eis/minimal-di,eis/minimal-di,eis/minimal-di