Spring Boot 不 Autowiring @Repository

Question

我正在尝试使用 Spring Boot 配置数据源，但出现org.springframework.beans.factory.BeanCreationException: 创建名称为“authenticationServiceImpl”的 bean 时出错: Autowiring 依赖项注入(inject)失败；嵌套异常是 org.springframework.beans.factory.BeanCreationException:无法 Autowiring 字段:私有(private) com.mycompany.myapp.repository.UserRepository com.mycompany.myapp.service.AuthenticationServiceImpl.userRepository；嵌套异常是 org.springframework.beans.factory.NoSuchBeanDefinitionException:没有找到依赖项 [com.mycompany.myapp.repository.UserRepository] ​​类型的合格 bean:预计至少有 1 个有资格作为此依赖项的 Autowiring 候选者的 bean。依赖注释:{@org.springframework.beans.factory.annotation.Autowired(required=true)}

这是我的项目结构:

主类:

package com.mycompany.myapp;
@ComponentScan(basePackageClasses = {com.mycompany.myapp.domain.user.User.class,
                                     com.mycompany.myapp.repository.UserRepository.class,
                                     com.mycompany.myapp.service.AuthenticationServiceImpl.class})
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

域类:

package com.mycompany.myapp.domain.user
@Entity
public class User {

    @Id
    @GeneratedValue
    private long id;
    @Column(nullable = false)
    private String name;
    @Column(nullable = false)
    private String lastName;
    @Column(nullable = false)
    private String password;
    @Column(nullable = false)
    private String email;

    public User() {}

    public User(String email, String password){
        this.email = email;
        this.password = password;
    }
}

存储库:

package com.mycompany.myapp.repository;
public interface UserRepository extends CrudRepository<User, Long> {

    List<User> findByLastName(String lastName);
}

Controller

package com.mycompany.myapp.service;
@RestController
public class AuthenticationServiceImpl implements AuthenticationService {

    @Autowired
    private UserRepository userRepository;

    @RequestMapping("/add")
    public User add(){
        User user = new User();
        user.setName("Juan");
        user.setLastName("Sarpe");
        user.setEmail("<a href="https://stackoverflow.com/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="afcac2cec6c3efc8c2cec6c381ccc0c2" rel="noreferrer noopener nofollow">[email protected]</a>");
        userRepository.save(user);
        return user;
    }
}

应用程序属性

spring.datasource.url:jdbc:mysql://localhost:3306/mydb
spring.datasource.username=user
spring.datasource.password=pass
spring.datasource.driverClassName=com.mysql.jdbc.Driver
spring.jpa.hibernate.ddl-auto=update

我猜我的应用程序没有检测到 UserRepository 上的 @Repository 注释。据我所知，Spring Boot 会自动将我的类设置为 @Repository，因为它扩展了 CrudRepository。我究竟做错了什么？ (请注意，我的应用程序类位于包层次结构的顶部)。

Answer 1

在 Spring Boot 的主类中，您必须使用以下注释:

@SpringBootApplication
@ComponentScan(basePackages = "basepackage")
@EntityScan(basePackages ="basepackage")
@EnableAutoConfiguration
@EnableJpaRepositories(basePackages = "basepackage")

在存储库层中使用以下注释:

导入org.springframework.stereotype.Repository;

导入org.springframework.transaction.annotation.Transactional;

@Transactional
@Repositor

如果您有任何服务层，请在实现类中使用以下注释:

import org.springframework.stereotype.Service;

@Service