我在Spring MVC中有错误。
Exception in thread "main" org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [service.NewsServiceImpl] is defined
at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBean(DefaultListableBeanFactory.java:373)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBean(DefaultListableBeanFactory.java:333)
at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1088)
at controller.Testing.main(Testing.java:24)
NewsDAImpl代码是:
@Repository
public class NewsDAImpl implements NewsDA {
@PersistenceContext
private EntityManager context;
@Override
public News ... Some Other Codes
我的NewsServiceImpl类:
@Service
@Transactional
public class NewsServiceImpl implements NewsService{
@Autowired
private NewsDAImpl newsDa;
@Override
public News ... Some Other Codes
我编写具有静态void main的控制器,仅用于测试。在那里我写了这个:
ApplicationContext context = new AnnotationConfigApplicationContext(ProjectConfig.class);
然后我用getBean方法得到新闻服务:
NewsServiceImpl service = context.getBean(NewsServiceImpl.class);
更改
NewsServiceImpl service = context.getBean(NewsServiceImpl.class);
至
NewsService service = context.getBean(NewsService.class);
你有NewServiceImpl
用@Transactional
注释,所以默认情况下spring会创建一个代理当然实现NewsService
而不是NewsServiceImpl
。