Spring AutoWired 服务类异常

Question

伙计们，我很快就会生气:) 我有一个基本的 Service 类，如下所示

@Service
public class CategoryService {


@Autowired
@Qualifier("categoryDaoImp")
CategoryDaoImp categoryDaoImp;

@PostConstruct
public void asdasdas()
{
    System.out.println("Yaratıldı");

}


public CategoryService()
{
    System.out.println("Bla Bla");

}

}

这是我的异常..

Error creating bean with name 'categoryService': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.iu.eblood.daoImp.CategoryDaoImp com.iu.eblood.serviceImp.CategoryService.categoryDaoImp; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No matching bean of type [com.iu.eblood.daoImp.CategoryDaoImp] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true), @org.springframework.beans.factory.annotation.Qualifier(value=categoryDaoImp)}

我确信已创建 CategoryDaoImp 类..因为我在上下文和调试模式中看到 创建的班级列表是

 org.springframework.context.annotation.internalConfigurationAnnotationProcessor,
 org.springframework.context.annotation.internalAutowiredAnnotationProcessor,
 org.springframework.context.annotation.internalRequiredAnnotationProcessor,
 org.springframework.context.annotation.internalCommonAnnotationProcessor,
 org.springframework.context.annotation.internalPersistenceAnnotationProcessor,
 categorydaoimp,
 categoryService,
 org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor#0,
 DB2DataSource
 ,sessionFactory,
hibernateTemplate,
 org.springframework.aop.config.internalAutoProxyCreator,
 org.springframework.transaction.annotation.AnnotationTransactionAttributeSource#0,
 org.springframework.transaction.interceptor.TransactionInterceptor#0,
 org.springframework.transaction.config.internalTransactionAdvisor,
 org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor#0,
 DB2TransactionManager

Answer 1

查看 bean 名称和类型 (CategoryDaoImp)，我猜有一个 CategoryDao 接口。尝试这样做：

@Autowired
CategoryDao categoryDao;

问题是您在 CategoryDao 上放置的 @Transactional 注释（再次猜测）。