Nixos: Add java env flake

env/flake_java.nix

@@ -0,0 +1,33 @@
+{
+  description = "Java Environment";
+
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  inputs.flake-utils.url = "github:numtide/flake-utils";
+  inputs.devshell.url = "github:numtide/devshell";
+
+  outputs = {
+    self,
+    nixpkgs,
+    flake-utils,
+    devshell,
+  }:
+    flake-utils.lib.eachDefaultSystem (system: let
+      pkgs = import nixpkgs {
+        inherit system;
+        config.allowUnfree = true; # For clion
+        overlays = [devshell.overlays.default];
+      };
+    in {
+      devShell = pkgs.devshell.mkShell {
+        name = "Java Environment";
+
+        packages = with pkgs; [
+          jdk22
+          jdt-language-server
+          gradle
+        ];
+
+        commands = [];
+      };
+    });
+}