1. 复现问题

今天在测试如下代码时：

@SpringBootTest
class LowCodeApplicationTests {@Autowired private Userservice userservice;@Testvoid contextLoads() {List<User> users = userservice.queryByParam("测试");for (User user : users) {System.out.println(user);}}
}

报错如下错误：

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userMapper' defined in file [D:\project\target\classes\com\cloud\lowcode\mapper\UserMapper.class]: Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Property 'sqlSessionFactory' or 'sqlSessionTemplate' are requiredat org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1786)at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:602)at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:524)at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335)at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234)at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333)at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:213)at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.resolveBeanByName(AbstractAutowireCapableBeanFactory.java:461)at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.autowireResource(CommonAnnotationBeanPostProcessor.java:527)at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.getResource(CommonAnnotationBeanPostProcessor.java:497)at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor$ResourceElement.getResourceToInject(CommonAnnotationBeanPostProcessor.java:650)at org.springframework.beans.factory.annotation.InjectionMetadata$InjectedElement.inject(InjectionMetadata.java:228)at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:119)at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.postProcessProperties(CommonAnnotationBeanPostProcessor.java:318)... 83 more
Caused by: java.lang.IllegalArgumentException: Property 'sqlSessionFactory' or 'sqlSessionTemplate' are requiredat org.springframework.util.Assert.notNull(Assert.java:201)at org.mybatis.spring.support.SqlSessionDaoSupport.checkDaoConfig(SqlSessionDaoSupport.java:122)at org.mybatis.spring.mapper.MapperFactoryBean.checkDaoConfig(MapperFactoryBean.java:73)at org.springframework.dao.support.DaoSupport.afterPropertiesSet(DaoSupport.java:44)at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1845)at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1782)... 96 more

即错误信息为：java.lang.IllegalArgumentException: Property 'sqlSessionFactory' or 'sqlSessionTemplate' are required。

2. 分析问题

将该错误信息翻译成中文为java.lang.IllegalArgumentException：属性“sqlSessionFactory”或“sqlSessionTemplate”是必需的。

2.1 检查是否引入了mybatis的jar包

<properties><java.version>1.8</java.version><mybatisStarter.version>2.2.2</mybatisStarter.version><baomidouStarter.version>1.0.5</baomidouStarter.version><baomidouMybatisPlus.version>2.1.9</baomidouMybatisPlus.version>
</properties><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>${mybatisStarter.version}</version>
</dependency>
<dependency><groupId>com.baomidou</groupId><artifactId>mybatisplus-spring-boot-starter</artifactId><version>${baomidouStarter.version}</version>
</dependency>
<dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus</artifactId><version>${baomidouMybatisPlus.version}</version>
</dependency>

2.2 检查启动类的配置

检查启动类是否加上MapperScan，如下已加上该注解：

@SpringBootApplication(exclude= {DataSourceAutoConfiguration.class})
@MapperScan("com.**.mapper")
public class LowCodeApplication {public static void main(String[] args) {SpringApplication.run(LowCodeApplication.class, args);}}

2.3 检查xml文件对应java类的配置是否有误

如下是userMapper.xml配置信息：

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.cloud.lowcode.mapper.UserMapper"><select id="queryByParam" parameterType="string" resultType="com.cloud.lowcode.entity.po.User">SELECT * FROM `user`<where><if test="username != null || username.length > 0">name = #{username}</if></where></select>
</mapper>

再看对应的UserMapper.java类，如下所示：

package com.cloud.lowcode.mapper;import com.baomidou.mybatisplus.mapper.BaseMapper;
import com.cloud.lowcode.entity.po.User;
import org.apache.ibatis.annotations.Mapper;import java.util.List;/*** @author 念兮为美* @datetime 2022/11/28 13:51* @desc 用户实体类*/
@Mapper
public interface UserMapper extends BaseMapper<User> {List<User> queryByParam(String username);
}

userMapper.xml和userMapper.java对应如下：

userMapper.xml和UserMapper.java的名字一样(不包括后缀名)
userMapper.xml中的namespace为com.cloud.lowcode.mapper.UserMapper对应UserMapper.java中的包名+类名，没问题
userMapper.xml中的id为queryByParam对应UserMapper.java中的方法名，没问题
userMapper.xml中的参数类型parameterType为string对应UserMapper.java中的queryByParam字符串类型，没问题
经检查resultType也没问题

2.4 检查application.yml文件的mybatis配置是否有误

如下是application.yml配置的mybatis信息：

#mybatis配置
mybatis-plus:configuration:log-impl: org.apache.ibatis.logging.stdout.StdOutImplmapper-locations: classpath*:/mapper/*Mapper.xmltype-aliases-package: com.cloud.lowcode.entity.po

该配置信息没有问题。

2.5 检查pon.xml文件

<build><resources><resource><directory>src/main/resources</directory><includes><include>**/*.yml</include><include>**/*.xml</include></includes><filtering>true</filtering></resource><resource><directory>src/main/java</directory><filtering>true</filtering></resource></resources>
</build>

pom.xml中已配置了resource信息，也没有问题。

以上四种情况，都没有问题，那么，问题出现在哪里呢？

3. 解决问题

尝试删除启动类中的exclude={DataSourceAutoConfiguration.class}，即修改成如下代码：

@SpringBootApplication
@MapperScan("com.**.mapper")
public class LowCodeApplication {public static void main(String[] args) {SpringApplication.run(LowCodeApplication.class, args);}}

重新启动测试类，便能成功运行，如下代码所示：

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