boot method of a ServiceProvided gets an instance of Laravel\Lumen\Application.

A second argument is not provided.

In `Laravel\Lumen\Application` method to assign a short-hand key for
middleware is called `routeMiddleware`.

Author: jelhan

src/ServiceProvider.php

@@ -41,10 +41,9 @@
 use CloudCreativity\LaravelJsonApi\Http\Responses\Responses;
 use CloudCreativity\LaravelJsonApi\Services\JsonApiService;
 use CloudCreativity\LaravelJsonApi\Validators\ValidatorErrorFactory;
-use Illuminate\Contracts\Foundation\Application;
 use Illuminate\Contracts\Routing\ResponseFactory as ResponseFactoryContract;
-use Illuminate\Routing\Router;
 use Illuminate\Support\ServiceProvider as BaseServiceProvider;
+use Laravel\Lumen\Application;
 use Neomerx\JsonApi\Contracts\Document\DocumentFactoryInterface;
 use Neomerx\JsonApi\Contracts\Encoder\Handlers\HandlerFactoryInterface;
 use Neomerx\JsonApi\Contracts\Encoder\Parser\ParserFactoryInterface;
@@ -85,11 +84,9 @@ class ServiceProvider extends BaseServiceProvider
      * @param ResponseFactoryContract $responses
      */
     public function boot(
-        Router $router,
-        ResponseFactoryContract $responses
+        Application $router
     ) {
         $this->bootMiddleware($router);
-        $this->bootResponseMacro($responses);
     }
 
     /**
@@ -116,13 +113,20 @@ public function register()
      *
      * @param Router $router
      */
-    protected function bootMiddleware(Router $router)
+    protected function bootMiddleware(Application $router)
     {
         /** Laravel 5.4 */
         if (method_exists($router, 'aliasMiddleware')) {
             $router->aliasMiddleware('json-api', BootJsonApi::class);
             $router->aliasMiddleware('json-api.authorize', AuthorizeRequest::class);
             $router->aliasMiddleware('json-api.validate', ValidateRequest::class);
+        } /** Lumen **/
+        else if (method_exists($router, 'routeMiddleware')) {
+            $router->routeMiddleware([
+                'json-api' => BootJsonApi::class,
+                'json-api.authorize' => AuthorizeRequest::class,
+                'json-api.validate' => ValidateRequest::class,
+            ]);
         } /** Laravel 5.1|5.2|5.3 */
         else {
             $router->middleware('json-api', BootJsonApi::class);