@Autowire 因 @Repository 而失败 [英] @Autowire failing with @Repository

问题描述

我无法使 @Autowire 注释与 @Repository 注释类一起工作.

I am not being able to make @Autowire annotation work with a @Repository annotated class.

我有一个界面:

public interface AccountRepository {
    public Account findByUsername(String username);
    public Account findById(long id);
    public Account save(Account account);
}

以及实现接口的类用@Repository 注释:

@Repository
public class AccountRepositoryImpl implements AccountRepository {
    public Account findByUsername(String username){
        //Implementing code
    }
    public Account findById(long id){
        //Implementing code            
    }
    public Account save(Account account){
        //Implementing code
    }
}

在另一个类中，我需要使用此存储库通过用户名查找帐户，因此我使用的是自动装配，但我正在检查它是否有效并且 accountRepository 实例始终为空:

In another class, I need to use this repository to find an account by the username, so I am using autowiring, but I am checking if it works and the accountRepository instance is always null:

@Component
public class FooClass {
    @Autowired
    private AccountRepository accountRepository;

    ...

    public barMethod(){
        logger.debug(accountRepository == null ? "accountRepository is NULL" : "accountRepository IS NOT NULL");
    }
}

我还设置了包来扫描组件(sessionFactory.setPackagesToScan(new String [] {"com.foo.bar"});)，并且它会自动装配其他带注释的类以@Component 为例，但在这个用@Repository 注释的，它总是为空.

I have also set the packages to scan for the components (sessionFactory.setPackagesToScan(new String [] {"com.foo.bar"});), and it does autowire other classes annotated with @Component for instance, but in this one annotated with @Repository, it is always null.

我错过了什么吗?

推荐答案

您的问题很可能是您自己使用 new 实例化 bean，因此 Spring 没有意识到这一点.改为注入 bean，或者使 bean @Configurable 并使用 AspectJ.

Your problem is most likely that you're instantiating the bean yourself with new, so that Spring isn't aware of it. Inject the bean instead, or make the bean @Configurable and use AspectJ.

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