setup.py broken on Ubuntu with openjdk 14

Installation on Ubuntu 20.04.1 LTS, with apt installed openjdk 14 (jre+ headless)
setup install fails without any usefull info,
seting :
export JAVA_HOME=/usr/lib/jvm/java-14-openjdk-amd64/ allowed the setup to finish,
java detection script is broken (at least on my 20.04 ubuntu)