Spring Boot JPA Crud存储库 [英] Spring Boot JPA CrudRepository

问题描述

我正在使用Spring Boot + Spring Data JPA，并在尝试注入扩展CrudRepository的类时遇到此问题:

I'm working with Spring Boot + Spring Data JPA and facing this problem when trying to inject a class that extends CrudRepository:

由以下原因引起:org.springframework.beans.factory.BeanCreationException: 创建名称为'topicRepository'的bean时出错:无法解析 匹配的构造函数(提示:指定索引/类型/名称参数 避免类型歧义的简单参数)

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'topicRepository': Could not resolve matching constructor (hint: specify index/type/name arguments for simple parameters to avoid type ambiguities)

存储库类:

public interface TopicRepository extends CrudRepository<Topic, Integer> {}

服务等级:

@Service
public class TopicService {

      @Autowired
      private TopicRepository topicRepository;
}

有什么建议吗?

推荐答案

我遇到了同样的问题，并且我通过切换Spring Boot版本来解决了这个问题.更改Spring Data JPA版本并没有执行任何操作(这是我假设的错误所在)，因此我认为Spring Boot版本1.5.1中存在一个错误.我切换回1.4.3版，错误消失了.我没有尝试过后续版本/不同版本，因此您可能只需要试验依赖项及其版本.

I was having the same issue, and I fixed it by switching Spring Boot versions. Changing the Spring Data JPA versions did nothing (this is where I assumed the bug would be), so I think there is a bug in Spring Boot version 1.5.1. I switched back to version 1.4.3 and the error was gone. I didn't try subsequent/different versions, so you may just have to experiment with your dependencies and their versions.

为便于记录，您可以为服务类添加@Repository注释，这应该没有任何区别.我一直在使用service/dao模式以相同的方式设置这些应用程序，并且从来没有对注释过分挑剔.希望这可以帮助那些Spring Boot开发流程突然抛出错误的人！

For the record, you can have your service class annotated with @Repository, it shouldn't make any difference. I've been setting these apps up the same way using the service/dao pattern, and it has never been too picky with the annotations. Hopefully this may help others whose Spring Boot development flow suddenly throws an error!

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