我正在尝试使用 JpaRepository 将数据推送到我的数据库中，但是有一些错误阻止我这样做

Question

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

Description:

Field userRepository in com.Lex.Exercise.Service.RegistrationService required a bean of type 'com.Lex.Exercise.Repository.UserRepository' 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 'com.Lex.Exercise.Repository.UserRepository' in your configuration.

//用户存储库

package com.Lex.Exercise.Repository;

import org.springframework.data.jpa.repository.JpaRepository;

import com.Lex.Exercise.Model.UserEntity;

  public interface UserRepository extends JpaRepository<UserEntity, String>{

  }

//注册服务

@ComponentScan(basePackages = "com.Lex.Exercise.Repository")
@Component
public class RegistrationService {  
@Autowired
private UserRepository userRepository;
//business methods and other validations comes here
}

这是主类

    package com.Lex.Exercise.SpringBootDemo;
@SpringBootApplication
@PropertySource(value = { "classpath:configuration.properties" })
public class SpringBootDemoApplication implements CommandLineRunner {

    @Autowired
    private RegistrationService service;
    public static void main(String[] args) {
        SpringApplication.run(SpringBootDemoApplication.class, args);
    }
}

以下是项目结构： /SpringBootDemo/src/main/java/com/Lex/Exercise/Model/User.java /SpringBootDemo/src/main/java/com/Lex/Exercise/Model/UserEntity.java /SpringBootDemo/src/main/java/com/Lex/Exercise/Repository/UserRepository.java /SpringBootDemo/src/main/java/com/Lex/Exercise/Service/RegistrationService.java /SpringBootDemo/src/main/java/com/Lex/Exercise/SpringBootDemo/SpringBootDemoApplication.java /SpringBootDemo/src/main/resources/application.properties /SpringBootDemo/src/main/resources/configuration.properties

请帮我解决这个问题

Answer 1

删除您的RegistrationService.class 上的@ComponentScan(scanBasePackages = "com.Lex.Exercise.Repository")

你的SpringBootDemoApplication.class 应该是这样的。比com.Lex.Exercise 子包中的组件将被注入到应用程序上下文中。

@SpringBootApplication
@ComponentScan(basePackages = {"com.Lex.Exercise"})
public class SpringBootDemoApplication{
    public static void main(String[] args) {
        new SpringApplication(SpringBootDemoApplication.class).run(args);
    }
}

一般来说，将 SpringApplication 放在顶级包中是个好主意（就像你的情况 com.Lex.Exercise），因为 Spring Boot 会自动扫描该类的所有子包。所以你不需要额外的@ComponentScan

Answer 2

@ComponentScan(basePackages = "com.Lex.Exercise.Repository") 属于您的配置，可能是您的应用程序类