For some software, there is necessary to have java version 8 (or higher). I'm on ubuntu (16.04) and I installed java so:
sudo apt-get update
sudo apt-get install default-jre
now check java version: java -version
this gives: openjdk version "1.8.0_181"
OpenJDK Runtime Environment (build 1.8.0_181-8u181-b13-0ubuntu0.16.04.1-b13)
OpenJDK 64-Bit Server VM (build 25.181-b13, mixed mode)
I dont get it, currently, there is java version 9(?) and I installed so old (1.8) version ?
May be very stupid question, I'm very far from java and it's versioning