CrudRepository 在我的自定义存储库实现中 [英] CrudRepository inside my custom repository implementation

问题描述

我正在尝试获取对我的存储库接口 (UserRepository) 的引用，该接口在我的自定义实现 (UserRepositoryExtensionImpl) 中按顺序扩展了 CrudRepository访问 Spring JPA 提供的所有方法.

I am attempting to get a reference to my repository interface (UserRepository) that extends CrudRepository within my custom implementation (UserRepositoryExtensionImpl) in order to gain access to all the methods provided by Spring JPA.

原油扩展:

@Repository
public interface UserRepository extends CrudRepository<User, String>, UserRepositoryExtension<RosterUser> {
    ...any custom spring JPA methods...
}

扩展接口:

@Repository
public interface UserRepositoryExtension <T> {
   public T put(T entity);
}

自定义实现:

public class UserRepositoryExtensionImpl implements UserRepositoryExtension<User> {

    UserRepository userRepository;

    @Autowired
    public UserRepositoryExtensionImpl(UserRepository userRepository) {
        this.userRepository = userRepository;
    }

    @Override
    public User put(User user) {
        System.out.println(user + "was put");
        // ...put logic here
        return null;
    }...
}

但是，我无法注入 UserRepository，因为存在循环依赖(假设 UserRepository 扩展了由我的 UserRepositoryImpl 实现的接口).我收到以下错误:

However, I am unable to inject UserRepository since a circular dependency exists (given that UserRepository extends the interface implemented by my UserRepositoryImpl). I am getting the following error:

org.springframework.beans.factory.BeanCurrentlyInCreationException: Error creating bean with name '    userRepositoryImpl': Requested bean is currently in creation: Is there an unresolvable circular     reference?

一种可能但不太理想的解决方案是将 EntityManager 注入 UserRepositoryImp，但在这种情况下，我无法访问任何 Spring JPACrudRepository 提供的方法，或我可能在 UserRepository 中创建的任何其他方法.

A possible, but less than ideal solution would be to inject and EntityManager into UserRepositoryImp, but in that case, I do not have access to any of the Spring JPA methods provided by CrudRepository, or any additional methods that I might have created in UserRepository.

关于如何解决这个问题有什么建议吗?

Any suggestions on how to get around this?

任何帮助将不胜感激.

正如@shelley 的回答中所述，我能够通过进行 3 次更改来解决此问题:

As mentioned in @shelley's answer, I was able to solve this by making 3 changes:

• 从 UserRepositoryExtensionImpl
中删除 @Repository
• 将 UserRepositoryExtensionImpl 重命名为 UserRepositoryImpl.显然，这让 Spring 意识到实现的存在.请参阅 Spring 文档
• 删除我的构造函数并将 @Autowired 移动到 userRepository 字段

• Removing the @Repository from UserRepositoryExtensionImpl
• Renaming UserRepositoryExtensionImpl to UserRepositoryImpl. Apparently this makes Spring aware of the implementation's existence. See Spring Doc
• Removing my constructor and moving the @Autowired to the userRepository field

成功！

推荐答案

一些小事情需要改变才能使其发挥作用:

A couple small things need to be changed in order for this to work:

• 从自定义存储库界面 (UserRepositoryExtension) 中删除 @Repository 注释.

自定义存储库实现实际上应该命名为Impl"而不是Impl".在您的代码示例中，这应该是 UserRepositoryImpl 而不是 UserRepositoryExtensionImpl.

The custom repository implementation should actually be named "<StandardRepository>Impl" rather than "<CustomRepository>Impl". In your code example, this should be UserRepositoryImpl instead of UserRepositoryExtensionImpl.

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