HelloWorldController.java

package com.quillbytes.scratch.web.controller;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
@EnableAutoConfiguration
public class HelloWorldController {
  @RequestMapping
  @ResponseBody String index() {
    return "Hello world!";
  }

  public static void main(String... args) {
    SpringApplication.run(HelloWorldController.class, args);
  }
}