bugfix(fastify): not registered fastify routes nestjs#1703

Author: kamilmysliwiec

packages/core/nest-application.ts

@@ -211,7 +211,7 @@ export class NestApplication extends NestApplicationContext
   public async listen(port: number | string, ...args: any[]): Promise<any> {
     !this.isInitialized && (await this.init());
 
-    this.httpServer.listen(port, ...args);
+    this.httpAdapter.listen(port, ...args);
     return this.httpServer;
   }
 
@@ -223,7 +223,7 @@ export class NestApplication extends NestApplicationContext
 
   public async close(): Promise<any> {
     this.socketModule && (await this.socketModule.close());
-    this.httpServer && this.httpServer.close();
+    this.httpAdapter && this.httpAdapter.close();
 
     await Promise.all(
       iterate(this.microservices).map(async microservice => {

packages/platform-express/adapters/express-adapter.ts

@@ -42,8 +42,14 @@ export class ExpressAdapter extends AbstractHttpAdapter {
     return response.set(name, value);
   }
 
+  public listen(port: string | number, callback?: () => void);
+  public listen(port: string | number, hostname: string, callback?: () => void);
+  public listen(port: any, hostname?: any, callback?: any) {
+    return this.httpServer.listen(port, hostname, callback);
+  }
+
   public close() {
-    return this.instance.close();
+    return this.httpServer ? this.httpServer.close() : undefined;
   }
 
   public set(...args: any[]) {