DPS - 3 - Make DPS jar compatible with jre 8

[mageddo]

What is expected

Make DPS jar run in jre 8

What is Happening

Actually compatible with jre 17

Changes (Optional)

• Initial work using jabel is done at this branch

Research

• jabel make it possible compile java 17 code into jre 8 target but won't support jdk9+ new methods or classes like Set.of() and go on
• UniJ has the proposal to implement jdk 9+ classes for jdk 8, the project is out of date and you need to use the prefix Uni for each class you use, like UniList.of()
• refaster maybe can fix unij limitation by merging the new implementations to List and go on
• here a discussion on jabel github about that but no proposal to merge all this stuff into a new tool
• Another impeditive to use jre 8 is that DPS need java 16 support for unix sockets to be fully compatible with docker, need to find a lib replacement for that, docker-java library have a lot of incompatible stuff with native image, old jres and so on though, maybe think in a better replacement for docker java

[mageddo]

we are considerably far to achieve this feature, better people try to use the binary releases or just download jre 17+ and use the jar

[mageddo]

I think it won't be possible, best choice is to tryout the native image binaries we have, and on the future also provide a Windows binary. As a fallback run the jar which requires jre 17+

[mageddo]

See #306 for windows binary release support