fix

modules/applications/java/default.nix

@@ -0,0 +1,25 @@
+{
+  lib,
+  config,
+  ...
+}:
+let
+  cfg = config.my.applications.java;
+in
+{
+  imports = [
+    ./home.nix
+    ./system.nix
+  ];
+
+  options.my.applications.java = {
+    enable = lib.mkEnableOption "Java runtime";
+    system.enable = lib.mkEnableOption "Java system configuration";
+    homeManager.enable = lib.mkEnableOption "Java home-manager configuration";
+  };
+
+  config = lib.mkIf cfg.enable {
+    my.applications.java.system.enable = lib.mkDefault true;
+    my.applications.java.homeManager.enable = lib.mkDefault true;
+  };
+}

modules/applications/java/home.nix

@@ -0,0 +1,23 @@
+{
+  lib,
+  config,
+  ...
+}:
+let
+  cfg = config.my.applications.java.homeManager;
+in
+{
+  options.my.applications.java.homeManager = {
+    enable = lib.mkEnableOption "Java home-manager configuration";
+  };
+
+  config.home-manager.sharedModules = [
+    {
+      config = lib.mkIf cfg.enable {
+        programs.java = {
+          enable = true;
+        };
+      };
+    }
+  ];
+}

modules/applications/java/system.nix

@@ -0,0 +1,27 @@
+{
+  pkgs,
+  lib,
+  config,
+  ...
+}:
+let
+  cfg = config.my.applications.java.system;
+in
+{
+  options.my.applications.java.system = {
+    enable = lib.mkEnableOption "Java system configuration";
+  };
+
+  config = lib.mkIf cfg.enable {
+    programs.java = {
+      enable = true;
+      package = pkgs.jdk25;
+    };
+
+    environment.systemPackages = with pkgs; [
+      jdk25 # Java Development Kit 25
+      maven # Java Build Tool
+      gradle # Java Build Tool
+    ];
+  };
+}