Micornaut Controller Path

[NoahELE]

package com.example.controller;

import io.micronaut.http.annotation.Controller;
import io.micronaut.http.annotation.Get;
import java.util.Map;

@Controller("")
public class HelloController {
  @Get("/hello")
  public Object hello() {
    return Map.of("message", "Hello, Micronaut!");
  }
}

With the controller above, when I start the application and try to GET /hello, the response is an error of not found.

How does Micronaut resolve the path?