Spring + MyBatis でのMySQL接続で起動時エラー

前提

SpringBootからMyBatisを用いてMySQLに接続するミニマムコードを作成したいです。
起動時エラーでマッパーがBeanとして認識されていない？ようなエラーで詰まっています。
なにが不足している、または間違っているかわかりますでしょうか？

発生している問題・エラーメッセージ

SampleService required a bean of type 'jp.co.demo.mapper.SampleMapper' that could not be found.

該当のソースコード

pom.xml

xml
1<dependency>
2	<groupId>mysql</groupId>
3	<artifactId>mysql-connector-java</artifactId>
4</dependency>
5<dependency>
6	<groupId>org.mybatis.spring.boot</groupId>
7	<artifactId>mybatis-spring-boot-starter</artifactId>
8	<version>2.1.3</version>
9</dependency>

application.properties

properties
1spring.datasource.url = jdbc:mysql://localhost:3306/test-db
2spring.datasource.username = root
3spring.datasource.password = pass
4spring.datasource.driver-class-name = com.mysql.cj.jdbc.Driver

java
1package jp.co.demo.bean;
2
3public class SampleUserBean {
4	private int user_id;
5	private String user_name;
6	private String password;
7
8	public int getUser_id() {
9		return user_id;
10	}
11
12	public void setUser_id(int user_id) {
13		this.user_id = user_id;
14	}
15
16	public String getUser_name() {
17		return user_name;
18	}
19
20	public void setUser_name(String user_name) {
21		this.user_name = user_name;
22	}
23
24	public String getPassword() {
25		return password;
26	}
27
28	public void setPassword(String password) {
29		this.password = password;
30	}
31}

java
1package jp.co.demo.controller;
2
3import org.springframework.beans.factory.annotation.Autowired;
4import org.springframework.stereotype.Controller;
5import org.springframework.web.bind.annotation.GetMapping;
6
7import jp.co.demo.service.SampleService;
8
9@Controller
10public class SampleController {
11	@Autowired
12	private SampleService sampleService;
13
14	@GetMapping("/sample")
15	public String sample() {
16		sampleService.sample();
17		return "sample";
18	}
19}
20

java
1package jp.co.demo.mapper;
2
3import java.util.List;
4
5import org.apache.ibatis.annotations.Mapper;
6import org.apache.ibatis.annotations.Select;
7
8import jp.co.demo.bean.SampleUserBean;
9
10@Mapper
11public interface SampleMapper {
12	@Select("select * from m_users;")
13	List<SampleUserBean> selectAll();
14}

java
1package jp.co.demo.service;
2
3import java.util.List;
4
5import org.springframework.beans.factory.annotation.Autowired;
6import org.springframework.stereotype.Service;
7
8import jp.co.demo.bean.SampleUserBean;
9import jp.co.demo.mapper.SampleMapper;
10
11@Service
12public class SampleService {
13	@Autowired
14	private SampleMapper sampleMapper;
15
16	public void sample() {
17		List<SampleUserBean> users = sampleMapper.selectAll();
18
19		for (SampleUserBean user : users) {
20			System.out.println(user.getUser_id() + ", " + user.getUser_name() + " " + user.getPassword());
21		}
22	}
23}