NouniQueBeanDefinitionException:...需要一个匹配bean，但找到2：

Question

我有这个超级班：

@Component
public class DAOBase {
}

@Component
public class VoceDAO extends DAOBase{       
}

@Service
public class TransactionService {
    @Autowired
    private DAOBase dAOBase;
}

Caused by: org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type [com.jeansedizioni.dao.DAOBase] is defined: expected single matching bean but found 2: DAOBase,voceDAO
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:865)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:770)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:486)
    ... 37 more

@Component("DAOBaseBeanName")
public class DAOBase {
}

我想确定我完全理解了解决方案。通过@component（“daoBaseBeanname”），我给类DAOBase指定了特定的名称“daoBaseBeanname”，应用程序可以用它来标识类DAOBase，这样就不会把它与扩展DAOBase的其他类混淆了。对吗？

谢谢你。

Answer 1

尝试添加@qualifier注释，如下所示：

 @Autowired
 @Qualifier("dAOBase")
 private DAOBase dAOBase;

指定要在类中注入哪个bean(daobase或vocedao)。