whitepage에러 질문드립니다

package mvcStructure.basic.request;

import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Slf4j
@Controller
public class RequestParamController {

    @RequestMapping("/request-param-v1")
    public void requestParamV1(HttpServletRequest request, HttpServletResponse response) throws IOException {
        String username = request.getParameter("username");
        int age = Integer.parseInt(request.getParameter("age"));

        response.getWriter().write("ok");
    }

    @ResponseBody
    @RequestMapping("/request-param-v3")
    public String  requestParamV3(@RequestParam String username,
                                  @RequestParam String age){
        log.info("username = {}, age = {}", username, age);
        return "ok";
    }

    //@RequestParam 생략하고 단순 타입이면 자동으로 RequestParam이라고 요청 파라미터라고 인식한다
    @ResponseBody
    @RequestMapping("/request-param-v4")
    public String  requestParamV34( String username, String age){
        log.info("username = {}, age = {}", username, age);
        return "ok";
    }

    @ResponseBody
    @RequestMapping("/request-param-Required")
    public String  requestParamRequired(
            @RequestParam(required = true) String username,
            @RequestParam(required = false) Integer age){
        log.info("username = {}, age = {}", username, age);
        return "ok";
    }
}


현재소스이고 경로는 아래와 같이 했습닌다 


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properties속성은 아래와 같습니다 

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#mvcStructure.~~ 패키지와 그 하위 로그레벨 설정

logging.level.root=info

logging.level.hello.springmvc=debug

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현재 접속하면 whitepage가 나는건 왜그런가요