{ description = "A Nix-flake-based Java development environment"; inputs = { nixpkgs.url = "github:NixOS/nixpkgs"; flake-utils.url = "github:numtide/flake-utils"; }; outputs = { self, nixpkgs, flake-utils }: flake-utils.lib.eachDefaultSystem (system: let jdk = "jdk17"; jdkPkg = pkgs.${jdk}; config = { packageOverrides = p: { sbt = p.sbt.override { jre = p.${jdk}; }; scala_3 = p.scala_3.override { jre = p.${jdk}; }; }; }; pkgs = import nixpkgs { inherit config jdk system; }; inherit (pkgs) mkShell; scala = pkgs.scala_3; buildTools = with pkgs; [ sbt ]; in { devShells = { default = pkgs.mkShell { buildInputs = [ scala jdkPkg ] ++ buildTools; shellHook = '' ${scala}/bin/scala -version ''; }; }; }); }