Question

我是春天的新手，我目前正在学习如何使用服务和存储库以及@autowired，但是在完成每个步骤之后它似乎并不适合我。从阅读错误我得到我可以看到使用@Autowired注入bean并不适用于我创建的服务类，因为它没有找到具有匹配条件的类。

这是我的服务界面。

public interface ArtistService {

void save(Artist artist);

Artist get(int id);

void remove(Artist artist);

List<Artist> findAll();
}

这是我的类实现我的服务接口

@Service
public class ArtistServiceImpl implements ArtistService {

ArtistRepository artistRepository;

@Autowired
public ArtistServiceImpl(ArtistRepository artistRepository) {
    this.artistRepository = artistRepository;
}

（实现了接口方法，但是为了保持这种紧凑而省略了）

我的启动应用

@SpringBootApplication
public class JdbcTutorialApplication implements CommandLineRunner {

@Autowired
ArtistService artistService;
@Autowired
ArtistRepository artistRepository;

}

@Autowired也没有为我想要添加的存储库工作，但它基本上与此完全相同，但它是一个存储库。

以下是我得到的错误的第一行

       org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'jdbcTutorialApplication': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: ie.cit.oossp.service.ArtistService ie.cit.oossp.JdbcTutorialApplication.artistService; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'artistServiceImpl' defined in file [C:\Users\Sean\Documents\College\3rd Year\OOSSP\STSWorkspace\JdbcTutorial\target\classes\ie\cit\oossp\service\ArtistServiceImpl.class]: Unsatisfied dependency expressed through constructor argument with index 0 of type [ic.cit.oossp.repository.ArtistRepository]: No qualifying bean of type [ic.cit.oossp.repository.ArtistRepository] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {}; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [ic.cit.oossp.repository.ArtistRepository] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {}

Answer 1

确保ArtistRepository扩展CrudRepository，如下所示。 SpringBoot将自动查找所有存储库并创建实例。您不需要注释存储库类。

public interface ArtistRepository extends CrudRepository<Artist, Long>

注入一个@Autowired不工作的bean

1 个答案: