Java 8 is a common problem that people face when they want to use MineOS because java 8 is not available in the official repository as its end of life. Stretch is also finished you could add the repo but i don’t see the point its an old outdated version of java 8, but basically this is why its a headache for people.
Minecraft versions from the very first version up until Minecraft 1.16 are still widely used and are subject to being java 8 based jvm’s.
This will be using Adopt variation of the JRE as the official java 8 is end of life. Which can be found here. There is many other options out there you can use this is just one of them.
This is just how i do it not that its right or wrong but it is easier for me to do it this way and makes sense to me. Here is how to obtain java 8 this is also applies to a 64bit binary so if you use a different platform then you will need to account for that.
Open a terminal and run the following as root
mkdir -p java
wget -O jre8.tar.gz https://github.com/AdoptOpenJDK/semeru8-binaries/releases/download/jdk8u345-b01_openj9-0.33.1/ibm-semeru-open-jre_x64_linux_8u345b01_openj9-0.33.1.tar.gz
Note: You can apply the above wget command and tailor it to specific JRE versions to suit your requirements which you can find the different releases at the top of this post. on the Adpot Github.
tar xf jre8.tar.gz
Inside your Minecraft servers directory you will find a file called
server.config open this file with a text editor of your choice and edit the following line so that it can find the JRE.
You should now be able to run your server as long as everything else is setup correctly.