Java 应用上下文中部分bean的依赖形成一个循环
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The dependencies of some of the beans in the application context form a cycle
提问by Laurent Maillet
I'm working on a Spring Boot v1.4.2.RELEASE application with JPA.
我正在使用 JPA 开发 Spring Boot v1.4.2.RELEASE 应用程序。
I defined repository interfaces and implementations
我定义了存储库接口和实现
ARepository
存储库
@Repository
public interface ARepository extends CrudRepository<A, String>, ARepositoryCustom, JpaSpecificationExecutor<A> {
}
ARepositoryCustom
ARepositoryCustom
@Repository
public interface ARepositoryCustom {
Page<A> findA(findAForm form, Pageable pageable);
}
ARepositoryImpl
ARepositoryImpl
@Repository
public class ARepositoryImpl implements ARepositoryCustom {
@Autowired
private ARepository aRepository;
@Override
public Page<A> findA(findAForm form, Pageable pageable) {
return aRepository.findAll(
where(ASpecs.codeLike(form.getCode()))
.and(ASpecs.labelLike(form.getLabel()))
.and(ASpecs.isActive()),
pageable);
}
}
And a service AServiceImpl
和一个服务 AServiceImpl
@Service
public class AServiceImpl implements AService {
private ARepository aRepository;
public AServiceImpl(ARepository aRepository) {
super();
this.aRepository = aRepository;
}
...
}
My application won't start with the message :
我的应用程序不会以以下消息开头：
*************************** APPLICATION FAILED TO START *************************** Description: The dependencies of some of the beans in the application context form a cycle: | aRepositoryImpl └─────┘
I followed all steps discribed in http://docs.spring.io/spring-data/jpa/docs/current/reference/html/#repositories.single-repository-behaviour
我遵循了http://docs.spring.io/spring-data/jpa/docs/current/reference/html/#repositories.single-repository-behaviour 中描述的所有步骤
Please help !
请帮忙 ！
Laurent
洛朗
采纳答案by Andrei Pietrusel
There's a simple fix for your original problem: Just remove @Repository from ARepositoryCustom and from ARepositoryImpl. Keep all the naming and interface/class hierarchies. They are all OK.
您的原始问题有一个简单的解决方法：只需从 ARepositoryCustom 和 ARepositoryImpl 中删除 @Repository。保留所有命名和接口/类层次结构。他们都没事。
回答by Phat H. VU
I've tested your source code, and found something tricky.
我已经测试了你的源代码，发现了一些棘手的问题。
First, with your source code, I got the following error:
首先，使用您的源代码，我收到以下错误：
There is a circular dependency between 1 beans in the application context:
- ARepositoryImpl (field private test.ARepository test.ARepositoryImpl.aRepository)
- aRepositoryImpl
Then, I guess Spring 'confused' between ARepository(JPA repository) and ARepositoryImpl(Custom repository).
So, I would suggest you renameARepositoryto something else, such as BRepository. It worked if I renamed the class name.
然后，我猜 Spring 在ARepository（JPA 存储库）和ARepositoryImpl（自定义存储库）之间“混淆”了。因此，我建议您重命名ARepository为其他名称，例如BRepository. 如果我重命名类名，它会起作用。
According to offcial documentation of Spring Data (https://docs.spring.io/spring-data/jpa/docs/current/reference/html/) :
根据 Spring Data 的官方文档（https://docs.spring.io/spring-data/jpa/docs/current/reference/html/）：
These classes need to follow the naming convention of appending the namespace element's attribute repository-impl-postfix to the found repository interface name. This postfix defaults to Impl
这些类需要遵循将命名空间元素的属性 repository-impl-postfix 附加到找到的存储库接口名称的命名约定。这个后缀默认为 Impl
