Add warning when no reflector is given

CHANGELOG.md

@@ -1,3 +1,6 @@
+# 2.0.0-rc.0
+* Log a warning when no `reflector` is provided.
+
 # 2.0.0-alpha.24
 * Add `AngelEnv` class to `core`.
 * Deprecate `Angel.isProduction`, in favor of `AngelEnv`.

example/main.dart

@@ -4,18 +4,15 @@ import 'package:angel_framework/http.dart';
 import 'package:logging/logging.dart';
 
 main() async {
-  var app = new Angel(
+  // Logging set up/boilerplate
+  Logger.root.onRecord.listen(print);
+
+  // Create our server.
+  var app = Angel(
     logger: Logger('angel'),
     reflector: MirrorsReflector(),
   );
 
-  app.logger = new Logger('angel')
-    ..onRecord.listen((rec) {
-      print(rec);
-      if (rec.error != null) print(rec.error);
-      if (rec.stackTrace != null) print(rec.stackTrace);
-    });
-
   // Index route. Returns JSON.
   app.get('/', (req, res) => 'Welcome to Angel!');
 
@@ -44,12 +41,12 @@ main() async {
 
   // Simple fallback to throw a 404 on unknown paths.
   app.fallback((req, res) {
-    throw new AngelHttpException.notFound(
+    throw AngelHttpException.notFound(
       message: 'Unknown path: "${req.uri.path}"',
     );
   });
 
-  var http = new AngelHttp(app);
+  var http = AngelHttp(app);
   var server = await http.startServer('127.0.0.1', 3000);
   var url = 'http://${server.address.address}:${server.port}';
   print('Listening at $url');

lib/src/core/server.dart

@@ -3,8 +3,6 @@ library angel_framework.http.server;
 import 'dart:async';
 import 'dart:collection' show HashMap;
 import 'dart:convert';
-import 'dart:io';
-
 import 'package:angel_container/angel_container.dart';
 import 'package:angel_http_exception/angel_http_exception.dart';
 import 'package:angel_route/angel_route.dart';
@@ -13,7 +11,6 @@ import 'package:http_parser/http_parser.dart';
 import 'package:logging/logging.dart';
 import 'package:mime/mime.dart';
 import 'package:tuple/tuple.dart';
-
 import 'controller.dart';
 import 'env.dart';
 import 'hooked_service.dart';
@@ -357,6 +354,16 @@ class Angel extends Routable {
       this.serializer,
       this.viewGenerator})
       : super(reflector) {
+    if (reflector == const EmptyReflector()) {
+      var msg =
+          'No `reflector` was passed to the Angel constructor, so reflection will not be available.\n'
+          'Features like controllers, constructor dependency injection, and `ioc` require reflection, '
+          'and will not work without it.\n\n'
+          'For more, see the documentation:\n'
+          'https://docs.angel-dart.dev/guides/dependency-injection#enabling-dart-mirrors-or-other-reflection';
+      logger?.warning(msg);
+    }
+
     bootstrapContainer();
     viewGenerator ??= noViewEngineConfigured;
     serializer ??= json.encode;