错误信息
org.springframework.beans.factory.UnsatisfiedDependencyException:
Error creating bean with name ‘indexController’: Unsatisfied dependency expressed through field ‘bookService’; nested exception is org.springframework.beans.factory.
UnsatisfiedDependencyException: Error creating bean with name ‘bookService’:
Unsatisfied dependency expressed through field ‘bookMapper’; nested exception is org.springframework.beans.factory.
NoSuchBeanDefinitionException: No qualifying bean of type ‘com.project.dao.BookMapper’ available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
我已经是二次入坑了，第一次没有做记录，结果导致第二次又忘了
解决办法
有以下几个原因：
1）service接口实现类上有没有加@Service注解，注解是不是引用的spring的类？不要导错包
2）接口有没有写实现类，实现类是实现的对应接口么?
3）有没有扫描Service所在的包
4）确保代码无误后，再看看包是否下载完整
- 查看注入是否正确
6）是否正确配置Listenter（就是这个原因一直在卡我）
org.springframework.web.context.ContextLoaderListener
