flake-templates.nix/java/flake.nix at main · ShellTux/flake-templates.nix · GitHub

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

  inputs.nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";

  outputs =
    { self, nixpkgs }:
    let
      javaVersion = 25; # Change this value to update the whole stack

      supportedSystems = [
        "x86_64-linux"
        "aarch64-linux"
        "x86_64-darwin"
        "aarch64-darwin"
      ];
      forEachSupportedSystem =
        f:
        nixpkgs.lib.genAttrs supportedSystems (
          system:
          f {
            pkgs = import nixpkgs {
              inherit system;
              overlays = [ 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 }:
        let
          inherit (pkgs) mkShell;
          inherit (pkgs.lib) getExe;
          inherit (pkgs) gradle maven;

          onefetch = getExe pkgs.onefetch;
        in
        {
          default = mkShell {
            packages =
              [
                gradle
                maven

                pkgs.gcc
                pkgs.jdk
                pkgs.ncurses
                pkgs.patchelf
                pkgs.zlib
              ]
              ++ [
                pkgs.entr
                pkgs.fd
                pkgs.jq
                pkgs.ripgrep
                pkgs.ripgrep-all
                pkgs.tokei
              ];

            shellHook =
              let
                loadLombok = "-javaagent:${pkgs.lombok}/share/java/lombok.jar";
                prev = "\${JAVA_TOOL_OPTIONS:+ $JAVA_TOOL_OPTIONS}";
              in
              ''
                export JAVA_TOOL_OPTIONS="${loadLombok}${prev}"
                ${onefetch} --no-bots 2>/dev/null
              '';
          };
        }
      );
    };
}