SpringBoot启动失败--扫描不到Bean

报错日志

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled. 2025-12-19 10:29:35.762 ERROR 580 --- [ main] o.s.b.d.LoggingFailureAnalysisReporter :

*************************** APPLICATION FAILED TO START ***************************

Description: Field userMapper in nuc.edu.testspring.Service.Impl.UserServiceImpl required a bean of type 'nuc.edu.testspring.mapper.UserMapper' that could not be found. The injection point has the following annotations: - @org.springframework.beans.factory.annotation.Autowired(required=true)

Action: Consider defining a bean of type 'nuc.edu.testspring.mapper.UserMapper' in your configuration.

进程已结束，退出代码为 1

解决方案

步骤 1：修复依赖兼容性问题（避免隐性报错）

你的mybatis-spring-boot-starter版本是 3.0.0，而 Spring Boot 2.6.13 和该版本不兼容（3.0.0 要求 Spring Boot 2.7+），需调整版本：

pom

<dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>2.2.2</version> <!-- 适配Spring Boot 2.6.x --> </dependency>

步骤 2: 给 Mapper 接口添加@Mapper注解

在UserMapper接口上添加 MyBatis 的@Mapper注解，示例：

java

package nuc.edu.testspring.mapper; import nuc.edu.testspring.entity.User; import org.apache.ibatis.annotations.Mapper; // 关键注解 import java.util.List; @Mapper // 标记为MyBatis Mapper，让Spring扫描并创建Bean public interface UserMapper { // 你的Mapper方法（比如查询用户） User selectById(Long id); }