springboot+mybatis Exception : org.springframework.beans.factory.NoSuchBeanDefinitionException - spring

Question

I got the following exception:
org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [pers.panxin.springboot.demo.mapper.UserMapper] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {#org.springframework.beans.factory.annotation.Autowired(required=true)}
Controller :
#Controller
public class HelloController {
#Autowired
private UserService userService;
#RequestMapping("/userList")
#ResponseBody
public String getAllUser(){
return "userList : "+userService.getAllUser().toString();//+list.toString();
}
}
Service:
public interface UserService {
public String getString();
public List<User> getAllUser();
}
ServiceImpl:
#Service
public class UserServiceImpl implements UserService {
#Autowired
private UserMapper userMapper;
#Override
public String getString() {
return "something else ... ";
}
#Override
public List<User> getAllUser() {
return userMapper.getAllUser();
}
}
Mapper Interface:
#Service
public interface UserMapper {
/**
* #return
*/
public List<User> getAllUser();
}
Application's main class
#ComponentScan
#EnableAutoConfiguration
#SpringBootApplication
public class ApplicationStarter {
public static void main(String[] args) {
SpringApplication.run(ApplicationStarter.class, args);
}
}
how the exception happened or something wrong in my code?

Answer 1

1.
I am not sure if you are using mybatis-spring library. If you are trying to integrate MyBatis with Spring you should use it. So make sure you have it as dependency.
2.
When you have mybatis-spring as dependency, just add this annotation to you configuration class:
#MapperScan("package.where.mappers.are.located")
It is because mybatis-spring has separate scanning for MyBatis mappers. Also you should remove #Service annotation from you mapper because if this separate mybatis-spring scanning.
EDIT:
As #Persia pointed out, you can use mybatis-spring-boot-starter library to pull mybatis-spring dependency into your Spring Boot project.

Answer 2

Get the same error today. Check the bean configuration org.mybatis.spring.mapper.MapperScannerConfigurer and org.mybatis.spring.SqlSessionFactoryBean. I mistyped the "basePackage" value for the former one, and the "typeAliasesPackage" value for the second one. After fixing the path, it works fine. Like this:
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<property name="typeAliasesPackage" value="package.path.to.your.model"/>
<property name="mapperLocations" value="classpath*:mappers/*.xml"/>
</bean>
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="package.path.to.your.dao"/>
</bean>

Answer 3

Add MappedTypes along with #MapperScan with
Code looks like the below
#MappedTypes({UserMapper.class})
#MapperScan("package.where.mappers.are.located")