spring boot 启动的时候required a bean of type 'XXX' that could not be

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.

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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:




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