{ description = "A Nix-flake-based Java development environment"; inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1"; outputs = inputs: let javaVersion = 17; 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${toString javaVersion}"; in { inherit jdk; maven = prev.maven.override { jdk_headless = jdk; }; gradle = prev.gradle.override { java = jdk; }; lombok = prev.lombok.override { inherit jdk; }; }; devShells = forEachSupportedSystem ( { pkgs }: { default = pkgs.mkShell { packages = with pkgs; [ gcc gradle jdk maven ncurses patchelf zlib ]; shellHook = let loadLombok = "-javaagent:${pkgs.lombok}/share/java/lombok.jar"; prev = "\${JAVA_TOOL_OPTIONS:+ $JAVA_TOOL_OPTIONS}"; in '' export JAVA_TOOL_OPTIONS="${loadLombok}${prev}" ''; }; } ); }; }