Fix

demo/src/main/java/com/example/demo/DemoApplication.java

@@ -9,7 +9,11 @@ public class DemoApplication {
 	public static void main(String[] args) {
 
 		System.out.println("Start application");
+
 		System.out.println("Another message");
+
+		System.out.println("Second message");
+
 		SpringApplication.run(DemoApplication.class, args);
 	}
 

demo/src/main/java/com/example/demo/controller/User.java

@@ -0,0 +1,4 @@
+package com.example.demo.controller;
+
+public class User {
+}

demo/src/main/java/com/example/demo/controller/UserController.java

@@ -0,0 +1,4 @@
+package com.example.demo.controller;
+
+public class UserController {
+}