为什么不能@Autowired 一个 JPA 存储库 - Spring boot + JPA答案

【问题标题】：Why can't @Autowired a JPA repository - Spring boot + JPA为什么不能@Autowired 一个 JPA 存储库 - Spring boot + JPA
【发布时间】：2022-01-24 12:05:27
【问题描述】：

我给出了这个错误：

Parameter 0 of constructor in x.microservice.module.business.application.BusinessCreator required a bean of type 'x.microservice.module.business.infrastructure.HibernateJpaRepository' that could not be found.

The injection point has the following annotations:
    - @org.springframework.beans.factory.annotation.Autowired(required=false)


Action:

Consider defining a bean of type 'x.microservice.module.business.infrastructure.HibernateJpaRepository' in your configuration.

控制器：

@Slf4j
@RestController
public final class BusinessPostController {

    @Autowired
    private BusinessCreator creator;

    @PostMapping(value = "/business")
    public ResponseEntity create(@RequestBody Request request){
        BusinessCreatorDto businessCreatorDto = new BusinessCreatorDto(IdentifierEpoch.generate(),request.getName());
        return ResponseEntity.ok(
                creator.create(businessCreatorDto)
        );
    }

}

应用层：

@AllArgsConstructor
@Service
public class BusinessCreator {

    @Autowired
    private HibernateJpaRepository repository;

    public BusinessResponse create(BusinessCreatorDto dto){

        Business business = new Business(dto.getId(), dto.getName());
        repository.save(business);

        return BusinessResponse.fromAggregate(business);
    }
}

在基础设施层

@Repository
public abstract class HibernateJpaRepository implements JpaRepository<Business, Long> {

}

启动应用程序：


@EnableJpaRepositories
@SpringBootApplication
public class MicroserviceApplication {

    public static void main(String[] args) {
        SpringApplication.run(MicroserviceApplication.class, args);
    }

}

所有依赖项都已解决，我认为其他类无关紧要。

有什么建议吗？非常感谢

【问题讨论】：

你有spring-boot-starter-data-jpa 依赖吗？您的存储库、服务、控制器是否都位于（包含配置文件的文件夹）下
错误出现在我的存储库中，我已更改为：@Repository public interface HibernateJpaRepository extends JpaRepository { } 现在运行正常。谢谢。

标签： spring-boot spring-data-jpa

【解决方案1】：

错误原因可能是HibernateJpaRepository - 它必须是扩展JpaRepository 的接口。

【讨论】：

【解决方案2】：

您可以在界面中编写自己的存储库：

@Repository
public interface HibernateJpaRepository extends JpaRepository < Business, Long > {
}

然后你的班级：

@AllArgsConstructor
@Service
public class BusinessCreator {

    @Autowired
    private HibernateJpaRepository repository;

    public BusinessResponse create(BusinessCreatorDto dto){

        Business business = new Business(dto.getId(), dto.getName());
        repository.save(business);

        return BusinessResponse.fromAggregate(business);
    }
}

【讨论】：