Nix and similar tools (Spack) promise a reproduciblity story for packages (from source or bitwise).
Specifically within Nix, several languages have successfully integrated into the ecosystem but some such as Java are oddly absent given their popularity.

In a search for how to better integrate Java into a Nix-centric workflow, we go over some current challenges with the fractured Java ecosystem and how the appeal of a federated artifact store has led to sharp edges.