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

问题描述

我试图在我的自定义实现中获取对我的存储库接口（ UserRepository ）的引用，该引用扩展了 CrudRepository （ UserRepositoryExtensionImpl ），以便访问Spring JPA提供的所有方法。

$ b Crud扩展：

  @Repository 
 public interface UserRepository扩展CrudRepository< User，String>，UserRepositoryExtension< RosterUser> {
 ...任何自定义Spring JPA方法... 
} 
  

扩展接口：

  @Repository 
 public interface UserRepositoryExtension< T> {
 public T put（T实体）; 
 
 
 
 $ b $ p $自定义实现：
 
  $ b  $ b  pre>  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）; 
 // ...把​​逻辑放在这里
返回null; 
} ... 
} 
  

然而，我无法注入 UserRepository ，因为存在循环依赖关系（假设 UserRepository 扩展了我的 UserRepositoryImpl ）。我收到以下错误：



  org.springframework.beans.factory.BeanCurrentlyInCreationException：创建名为'userRepositoryImpl'的bean时出错：请求的bean当前正在创建中：是否存在无法解析的循环引用？ 
  

一个可能但不太理想的解决方案是注入和 EntityManager 转换为 UserRepositoryImp ，但在这种情况下，我无法访问由 CrudRepository 提供的任何Spring JPA方法。 code>，或者我可能在UserRepository中创建的任何其他方法。

有关如何解决此问题的任何建议？

任何帮助将不胜感激。编辑：正如@ shelley的回答中提到的，我能够通过进行3次更改来解决这个问题：

/ p>

• 从 UserRepositoryExtensionImpl @Repository $ c $ <$>重命名 UserRepositoryExtensionImpl 至 UserRepositoryImpl 。显然这让Spring意识到了实现的存在。请参阅 Spring Doc a>


• 删除我的构造函数并将 @Autowired 移动到 userRepository

SUCCESS！

解决方案

一些小的事情需要改变才能使用：

• 删除 @存储库自定义存储库接口的注释（ UserRepositoryExtension ）。

定制存储库实现实际上应该命名为< StandardRepository> Impl ，而不是< CustomRepository> Impl 。在你的代码示例中，这应该是 UserRepositoryImpl ，而不是 UserRepositoryExtensionImpl 。

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.

Crud Extension:

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

Extension Interface:

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

Custom Implementation:

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;
    }...
}

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?

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.

Any suggestions on how to get around this?

Any help would be greatly appreciated.

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

• 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

SUCCESS!

解决方案

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

• Remove the @Repository annotation from the custom repository interface (UserRepositoryExtension).

• 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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