前提

「Spring 徹底入門」という書籍にて、Spring boot を用いたウェブアプリケーションを作成しています。
アプリケーションを実行したところ、404サーバエラーになります。

実現したいこと

listRooms.htmlを出したい。

発生している問題・エラーメッセージ

Whitelabel Error Page
This application has no explicit mapping for /error, so you are seeing this as a fallback.

Tue Jan 03 11:40:30 JST 2023
There was an unexpected error (type=Not Found, status=404).

該当のソースコード

package mrs;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;

@EnableJpaRepositories("mrs.domain.model")
@ComponentScan(basePackages = { "mrs.domain.repository" })
@SpringBootApplication
public class MrsApplication {

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

}

package mrs.app.room;

import java.time.LocalDate;
import java.util.List;

import mrs.domain.model.ReservableRoom;
import mrs.domain.service.room.RoomService;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.format.annotation.DateTimeFormat;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

@Controller
@RequestMapping(value = "rooms")
public class RoomsController {
	@Autowired
	RoomService roomService;

	@RequestMapping(method = RequestMethod.GET)
	String listRooms(Model model) {
		LocalDate today = LocalDate.now();
		List<ReservableRoom> rooms = roomService.findReservableRooms(today);
		model.addAttribute("date", today);
		return "room/listRooms";
	}
	
	@RequestMapping(path = "{date}", method = RequestMethod.GET)
	String listRooms(@DateTimeFormat(iso = DateTimeFormat.ISO.DATE) @PathVariable("date") LocalDate date, Model model) {
		List<ReservableRoom> rooms = roomService.findReservableRooms(date);
		model.addAttribute("rooms", rooms);
		return "room/listRooms";
	}
}

<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8" />
<title th:text="|${#temporals.format(date, 'yyyy/M/d')}の会議室|">2016/5/20の会議室</title>
</head>
<body>
	<h3>会議室</h3>
	<a th:href="@{'/rooms/' + ${date.minusDays(1)}}">&lt; 前日</a>
	<span th:text="|${#temporals.format(date, 'yyyy/M/d')}の会議室|">2016/5/20の会議室</span>
	<a th:href="@{'/rooms/' + ${date.plusDays(1)}}">翌日 &gt;</a>
	<ul>
		<li th:each="room: ${rooms}">
			<a th:href="@{'/reservations/' + ${date} + '/' + ${room.meetingRoom.roomId}}"
			   th:text="${room.meetingRoom.roomName}"></a>
		</li>
	</ul>
	<form th:action="@{/logout}" method="post">
		<button>ログアウト</button>
	</form>
</body>
</html>

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>3.0.1</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	<groupId>mrs</groupId>
	<artifactId>mrs</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>mrs</name>
	<description>Demo project for Spring Boot</description>
	<properties>
		<java.version>17</java.version>
	</properties>
	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-data-jpa</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-thymeleaf</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>

		<dependency>
			<groupId>org.postgresql</groupId>
			<artifactId>postgresql</artifactId>
			<scope>runtime</scope>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
		<dependency>
			<groupId>org.thymeleaf.extras</groupId>
			<artifactId>thymeleaf-extras-java8time</artifactId>
			<version>2.1.0.RELEASE</version>
		</dependency>
		<dependency>
    		<groupId>org.hibernate.javax.persistence</groupId>
    		<artifactId>hibernate-jpa-2.1-api</artifactId>
    		<version>1.0.0.Final</version>
		</dependency>
		
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>
</project>

spring.jpa.database=POSTGRESQL
spring.datasource.url=jdbc:postgresql://localhost:5432/mrs
spring.datasource.username=postgres
spring.datasource.password=pass
spring.jpa.hibernate.ddl-auto=validate
spring.jpa.properties.hibernate.format_sql=true
spring.datasource.sql-script-encoding=UTF-8
logging.level.org.hibernate.SQL=DEBUG
logging.level.org.hibernate.type.descriptor.sql.BasicBinder=TRACE
spring.datasource.separator=/;