Springboot整合Mybatis对dao包下的XXXMapper.java文件进行单元测试报错

Bertha 。 2022-05-17 01:30 214阅读 0赞

报错内容：

> org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'com.pblog.PblogApplicationTests': Unsatisfied dependency expressed through field 'userMapper'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.pblog.dao.UserMapper' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: \{@org.springframework.beans.factory.annotation.Autowired(required=true)\}
> 
> Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.pblog.dao.UserMapper' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: \{@org.springframework.beans.factory.annotation.Autowired(required=true)\}

单元测试文件内容：

> package com.pblog;
> 
> import org.junit.Test;  
> import org.junit.runner.RunWith;  
> import org.springframework.beans.factory.annotation.Autowired;  
> import org.springframework.boot.test.context.SpringBootTest;  
> import org.springframework.test.context.junit4.SpringRunner;
> 
> import com.pblog.dao.UserMapper;  
> import com.pblog.domain.User;
> 
> @RunWith(SpringRunner.class)  
> @SpringBootTest  
> public class PblogApplicationTests \{  
>   
>  @Autowired  
> private UserMapper userMapper;  
> @Test  
> public void userDaoTest() \{  
> User user=new User();  
> user.setUserName("刘备");  
> user.setUserEmail("1111111111@qq.com");  
> user.setUserPwd("123456");  
> int n=userMapper.insert(user);  
> if(n>0) \{  
> System.out.println("插入成功");  
> \}else \{  
> System.out.println("插入失败");  
> \}  
> \}  
>   
> \}

出错原因：spring找不到bean(UserMapper)

找到项目启动文件Application.java，内容如下：

> package com.pblog;
> 
> import org.mybatis.spring.annotation.MapperScan;  
> import org.springframework.boot.SpringApplication;  
> import org.springframework.boot.autoconfigure.SpringBootApplication;
> 
> @SpringBootApplication  
> public class PblogApplication \{
> 
> public static void main(String\[\] args) \{  
> SpringApplication.run(PblogApplication.class, args);  
> \}  
> \}

解决办法：在项目的启动类中加入MapperScan注解。

修改后的Application.java文件如下：

> package com.pblog;
> 
> import org.mybatis.spring.annotation.MapperScan;  
> import org.springframework.boot.SpringApplication;  
> import org.springframework.boot.autoconfigure.SpringBootApplication;
> 
> @SpringBootApplication  
> @MapperScan("com.pblog.dao")  
> public class PblogApplication \{
> 
> public static void main(String\[\] args) \{  
> SpringApplication.run(PblogApplication.class, args);  
> \}  
> \}

重新启动项目成功。