Ability to choose a Java version.

[ajh123]

Some Minecraft versions (or plugins) may require a specific Java version to run (for example Minestom or 1.20.6+ requires Java 21).

This can be achieved by installing SDKMAN inside proxy and server pods. SDKMAN can be used to install various JDKs.

The example YAML shows how one may configure their Java JDK.

apiVersion: shulkermc.io/v1alpha1
kind: ProxyFleet # or MinecraftServerFleet
metadata:
  name: public
spec:
  clusterRef:
    name: getting-started
  replicas: 1
  service:
    type: LoadBalancer
    externalTrafficPolicy: Local
  template:
    spec:
      javaVersion: 22.0.2-oracle # whatever gets put here will be passed to `sdk install java <version>`
      version:
        channel: Velocity # or Paper
        name: latest

[jeremylvln]

Hi @ajh123,

I've merged everything needed to work with Minecraft 1.21, by bumping Java to 21.

The Docker image I use supports selecting different Java versions, so I think I can have a mapping Minecraft Version → Java Version and select the most appropriate one, with the ability of overriding it in the config as you suggested.

I'm not sure if I should prioritize this, I think after the doc overhaul this can be a nice addition indeed :)

[ajh123]

I agree, it shouldn't be prioritized right now. I will test your updates to see if they work.