Add Java environment

java/.envrc

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+use flake .

java/flake.lock

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+{
+  "nodes": {
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1656928814,
+        "narHash": "sha256-RIFfgBuKz6Hp89yRr7+NR5tzIAbn52h8vT6vXkYjZoM=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "7e2a3b3dfd9af950a856d66b0a7d01e3c18aa249",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1659041591,
+        "narHash": "sha256-kKoy3tDZl3w0GuVlvJ6W/ERGRqeXy2+IGXL9g1a3F68=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "ab0794b1ae2756411d176dd5b82843a4ae56fe6e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

java/flake.nix

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+{
+  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
+        pkgs = import nixpkgs { inherit system; };
+
+        inherit (pkgs) mkShell;
+
+        java = pkgs.jdk17;
+
+        buildTools = with pkgs; [ ant gradle maven ];
+      in {
+        devShells = {
+          default = pkgs.mkShell {
+            nativeBuildInputs = [
+              java
+            ] ++ buildTools;
+
+            shellHook = ''
+              ${java}/bin/java -version
+            '';
+          };
+        };
+      }
+    );
+}