github.com_the-nix-way_dev-templates/kotlin/flake.nix

{
  description = "A Nix-flake-based Kotlin development environment";

  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1";

  outputs = inputs:
    let
      javaVersion = 23; # Change this value to update the whole stack

      supportedSystems = [ "x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin" ];
      forEachSupportedSystem = f: inputs.nixpkgs.lib.genAttrs supportedSystems (system: f {
        pkgs = import inputs.nixpkgs {
          inherit system;
          overlays = [ inputs.self.overlays.default ];
        };
      });
    in
    {
      overlays.default =
        final: prev:
        let
          jdk = prev."jdk${toString javaVersion}";
        in
        {
          gradle = prev.gradle.override { java = jdk; };
          kotlin = prev.kotlin.override { jre = jdk; };
        };

      devShells = forEachSupportedSystem ({ pkgs }: {
        default = pkgs.mkShell {
          packages = with pkgs; [
            gcc
            gradle
            kotlin
            ncurses
            patchelf
            zlib
          ];
        };
      });
    };
}