Whitelabel Error Page

'/hello'만 서비스되고 '/'에 대한 정의는 없기 때문에 발생한 에러

@GetMapping("/hello") -> @GetMapping("/") 변경하면 해결 됨

package com.example.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

@SpringBootApplication
@RestController
public class DemoApplication {

	public static void main(String[] args) {
		SpringApplication.run(DemoApplication.class, args);
	}
	
	@GetMapping("/hello")
	public String hello(@RequestParam(value="name", defaultValue="World") String name) {
		return String.format("Hello %s!", name);
	}
}