Property 'sqlSessionFactory' or 'sqlSessionTemplate' are required. The problem I cannot solve - mysql

Question

My question :
When I didn't use the #MapperScan in the Application Boot class, it has this kind of problems:
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.example.reggie.mapper.EmployeeMapper' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {#org.springframework.beans.factory.annotation.Autowired(required=true)}
at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoMatchingBeanFound(DefaultListableBeanFactory.java:1812) ~[spring-beans-6.0.3.jar:6.0.3]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1371) ~[spring-beans-6.0.3.jar:6.0.3]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1325) ~[spring-beans-6.0.3.jar:6.0.3]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:709) ~[spring-beans-6.0.3.jar:6.0.3]
... 34 common frames omitted
When I add the #MapperScan, the problem changes to this
Caused by: java.lang.IllegalArgumentException: Property 'sqlSessionFactory' or 'sqlSessionTemplate' are required
at org.springframework.util.Assert.notNull(Assert.java:204) ~[spring-core-6.0.3.jar:6.0.3]
at org.mybatis.spring.support.SqlSessionDaoSupport.checkDaoConfig(SqlSessionDaoSupport.java:122) ~[mybatis-spring-2.0.5.jar:2.0.5]
at org.mybatis.spring.mapper.MapperFactoryBean.checkDaoConfig(MapperFactoryBean.java:73) ~[mybatis-spring-2.0.5.jar:2.0.5]
at org.springframework.dao.support.DaoSupport.afterPropertiesSet(DaoSupport.java:44) ~[spring-tx-6.0.3.jar:6.0.3]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1797) ~[spring-beans-6.0.3.jar:6.0.3]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1747) ~[spring-beans-6.0.3.jar:6.0.3]
... 44 common frames omitted
My pom is
<?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>com.example</groupId>
<artifactId>reggie</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>reggie</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-web</artifactId>
</dependency>
<dependency>
<groupId>com.mysql</groupId>
<artifactId>mysql-connector-j</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.12</version>
</dependency>
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>3.4.2</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>1.1.9</version>
</dependency>
<dependency>
<groupId>commons-lang</groupId>
<artifactId>commons-lang</artifactId>
<version>2.1</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<excludes>
<exclude>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</exclude>
</excludes>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.19.1</version>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>16</source>
<target>16</target>
</configuration>
</plugin>
</plugins>
</build>
</project>
My Service is
package com.example.reggie.service;
import com.baomidou.mybatisplus.extension.service.IService;
import com.example.reggie.entity.Employee;
public interface EmployeeService extends IService<Employee> {
}
My service implementation is
package com.example.reggie.service.impl;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.example.reggie.entity.Employee;
import com.example.reggie.mapper.EmployeeMapper;
import com.example.reggie.service.EmployeeService;
import org.springframework.stereotype.Service;
#Service
public class EmployeeServiceImpl extends ServiceImpl<EmployeeMapper, Employee> implements EmployeeService {
}
My controller is
package com.example.reggie.controller;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.example.reggie.common.R;
import com.example.reggie.entity.Employee;
import com.example.reggie.service.EmployeeService;
import jakarta.annotation.Resource;
import jakarta.servlet.http.HttpServletRequest;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.util.DigestUtils;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
#Slf4j
#RestController
#RequestMapping("/employee")
public class EmplyeeController {
#Autowired
private EmployeeService employeeService;
/**
*
* #param request
* #param employee
* #return
*/
#PostMapping("/login")
public R<Employee> login(HttpServletRequest request , #RequestBody Employee employee){
String passwaord=employee.getPassword();
passwaord=DigestUtils.md5DigestAsHex(passwaord.getBytes());
LambdaQueryWrapper<Employee> queryWrapper=new LambdaQueryWrapper<>();
queryWrapper.eq(Employee::getUsername,employee.getUsername());
Employee emp=employeeService.getOne(queryWrapper);
if (emp==null){
return R.error("Failed");
}
if (!emp.getPassword().equals(passwaord)){
return R.error("Failed");
}
if (emp.getStatus()==0){
return R.error("Forbiidden.");
}
request.getSession().setAttribute("employee",emp.getId());
return R.success(emp);
}
}
I don't know why.Is this the problem between Mybaties and SpringBoot?
I hope to know that the reason of this problem.

Answer 1

I got the same problem, and i saw the answer by ave, i realized the version maybe not been supported any more for my Java17, so i changed the mybatis-spring-boot-starter from 2.2.1 to 3.0.1. Then the problem was solved.
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>3.0.1</version>
</dependency>