spring boot 启动的时候required a bean of type 'XXX' that could not be
- 学习笔录-spring boot
- 时间：2018-07-16 22:55
- 7848人已阅读
简介
Field mapper in com.demo.service.impl.UserServiceImpl required a bean of type 'com.kaigejava.kgblog.dao.UserDao' that could not be found.
🔔🔔🔔好消息!好消息!🔔🔔🔔
有需要的朋友👉:联系凯哥
Description:
Field mapper in com.kaigejava.kgblog,service.impl.UserServiceImpl required a bean of type 'com.kaigejava.kgblog.dao.UserDao' that could not be found.
Action:
Consider defining a bean of type 'com.kaigejava.kgblog.dao.UserDao' in your configuration.
SpringBoot启动失败，告诉我Bean配置失败，楼主看了看 该用的注解都用上了 这是咋的回事嘞？
先看错误的：
//@Component
@Repository
public interface UserMapper {
int insert(UserDomain record);
List<UserDomain> selectUsers();
}这两个注解都是用了，为什么还会报错呢?
查询：
解决方案一：
后来在网上看到网友说要用@Mapper注解，这才把问题解决了 至于具体原因，楼主还需要好好看看文档再来解释。
于是修改：
@Mapper
public interface UserDao {
int insert(UserDomain record);
List<UserDomain> selectUsers();
}重新启动，启动正常。访问ok.
解决方案二：
先看失败之前的Application(启动类)：
@SpringBootApplication
public class KgblogApplication {
public static void main(String[] args) {
SpringApplication.run(KgblogApplication.class, args);
}
}根据错误提示，没有UserDao这个bean.那么我们就在启动类上将该报扫描进去：
//@SpringBootApplication
@SpringBootApplication
@MapperScan(value = {"com.kaigejava.kgblog.dao"})
public class KgblogApplication {
public static void main(String[] args) {
SpringApplication.run(KgblogApplication.class, args);
}
}解决方案三: