Spring Boot 不自动装配 @Repository

问题描述

我正在尝试使用 Spring Boot 配置数据源，但出现 org.springframework.beans.factory.BeanCreationException:创建名为authenticationServiceImpl"的 bean 时出错:自动装配依赖项的注入失败；嵌套异常是 org.springframework.beans.factory.BeanCreationException:无法自动装配字段:private com.mycompany.myapp.repository.UserRepository com.mycompany.myapp.service.AuthenticationServiceImpl.userRepository;嵌套异常是 org.springframework.beans.factory.NoSuchBeanDefinitionException:未找到类型为 [com.mycompany.myapp.repository.UserRepository] ​​的合格 bean 依赖项:预计至少有 1 个 bean 有资格作为此依赖项的自动装配候选者.依赖注解:{@org.springframework.beans.factory.annotation.Autowired(required=true)}

I'm trying to configure a datasource with Spring Boot but I'm getting org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'authenticationServiceImpl': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.mycompany.myapp.repository.UserRepository com.mycompany.myapp.service.AuthenticationServiceImpl.userRepository; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.mycompany.myapp.repository.UserRepository] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@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);
}

控制器

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("[e-mail]");
        userRepository.save(user);
        return user;
    }
}

application.properties

application.properties

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我在 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.我做错了什么?(请注意，我的 Application 类位于包层次结构的顶部).

I guess my app is not detecting my @Repository annotation on UserRepository. As far as I know, Spring Boot will automatically set my class as @Repository because it is extending CrudRepository. What am I doing wrong? (Notice that my Application class is on top of packages hierarchy).

推荐答案

在 spring boot 的主类中，你必须使用下面的注释:

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

在 Repository 层使用下面的注释:

导入 org.springframework.stereotype.Repository;

import org.springframework.stereotype.Repository;

导入 org.springframework.transaction.annotation.Transactional;

import org.springframework.transaction.annotation.Transactional;

@Transactional
@Repositor

如果您有任何服务层，则在实现类中使用以下注释:

import org.springframework.stereotype.Service;

@Service

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