在编译时找不到Spring数据存储库 [英] Spring data repository not found at compile time

问题描述

我正在尝试在Spring Boot应用程序中使用Spring数据和存储库，但是在编译项目时出现错误.

I am trying to use Spring data and repositories in a Spring Boot application, but I have an error when compiling the project.

这是我的实体:

package fr.investstore.model;

import javax.persistence.Id;
...

@Entity
public class CrowdOperation {

    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    public Long id;

    @Enumerated(EnumType.STRING)
    public RepaymentType repaymentType;

    ...
}

以及相应的存储库:

package fr.investstore.repositories;

import org.springframework.data.repository.CrudRepository;
import org.springframework.data.repository.PagingAndSortingRepository;
import org.springframework.stereotype.Repository;

import fr.investstore.model.CrowdOperation;


public interface CrowdOperationRepository extends CrudRepository<CrowdOperation, Long> {

}

我在WS控制器中使用它，通过Autowired批注生成了一个存储库:

I use it in a WS controller, generating a repository through the Autowired annotation:

package fr.investstore.ws;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RequestMapping;
...

@Controller
@EnableAutoConfiguration
public class SampleController {

    @Autowired
    private CrowdOperationRepository crowdOperationRepository;


    @RequestMapping(path = "/", method = RequestMethod.GET)
    @ResponseBody
    public String getOperations(@RequestParam(required=true, defaultValue="Stranger") String name) {
        crowdOperationRepository.save(new CrowdOperation());
        return "Hello " + name;
    }
}

以及应用程序代码:

package fr.investstore;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

import fr.investstore.ws.SampleController;

@SpringBootApplication
public class InvestStoreApplication {

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

但是在编译项目时，我得到了:

But when compiling the project I get:

---

申请无法开始

---

APPLICATION FAILED TO START

描述:现场人群 fr.investstore.ws.SampleController需要一个类型为bean的bean 无法提供的"fr.investstore.repositories.CrowdOperationRepository" 被发现.

Description: Field crowdOperationRepository in fr.investstore.ws.SampleController required a bean of type 'fr.investstore.repositories.CrowdOperationRepository' that could not be found.

操作:考虑定义一个类型的bean 您的"fr.investstore.repositories.CrowdOperationRepository" 配置.

Action: Consider defining a bean of type 'fr.investstore.repositories.CrowdOperationRepository' in your configuration.

Spring是否不会通过界面为存储库自动生成一个bean? 我该如何解决?

Woudn't Spring automatically generate a bean for the repository through the interface? How can I resolve this?

我也尝试将Repository注释(来自org.springframework.stereotype.Repository)放到CrowdOperationRepository上，但是出现了相同的错误

I also tried to put the Repository annotation (from org.springframework.stereotype.Repository) onto CrowdOperationRepository, but I got the same error

推荐答案

在创建Spring-boot应用程序时，我们需要牢记一些重点，例如

While creating a spring-boot application, we need to keep some point in our mind like

1. 始终将主类(带有@SpringBootApplication批注的类)保留在顶级程序包中，而其他类应位于子程序包下.

1. Always keep main class (class with `@SpringBootApplication annotation) on the top level package and other classes should lie under sub-packages.

总是用适当的注释标记您的bean类，例如所有存储库均应标有@Repository注释，所有服务实现类应标有@Service，其他组件类应标有@Component，定义我们的bean的类应标为@Configuration

Always mark your bean classes with proper annotation e.g. all repositories should be marked by @Repository annotation, all service implementation classes should be marked with @Service, other component classes should be marked by @Component, class which defines our beans should be marked as @Configuration

启用您正在使用的功能，例如@EnableJpaRepositories，@EnableTransactionManagement，@EnableJpaAuditing，这些注释还提供了使我们能够定义spring需要扫描的软件包的功能.

Enable the feature which you are using e.g. @EnableJpaRepositories, @EnableTransactionManagement, @EnableJpaAuditing, these annotations also provides functionality which let us define which package spring needs to scan.

因此，在您的情况下，您需要使用@EnableJpaRepositories注释标记InvestStoreApplication类，并使用@Repository标记CrowdOperationRepository.

So in your case, you need to mark InvestStoreApplication class with @EnableJpaRepositories annotation and CrowdOperationRepository with @Repository.

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