I think I’m on the same page as @asbachb here. We should keep 8 and 11 around, but with explicit “LTS” labels so it’s clear that packages are depending on older versions. The default should roll as each 6-month release is created, and packages that depend on the jdk should generally depend on it. If a particular 6-month release is found to break a particular package, that package can be fixed by explicitly depending on the LTS release that’ll still be in nixpkgs.
We discussed this approach in: