springmvc注入类 NoUniqueBeanDefinitionException: No qualifying bean of type [] is defined: expected single错误 - 码上欢乐

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springmvc注入类 NoUniqueBeanDefinitionException: No qualifying bean of type [] is defined: expected single错误

本文转载自查看原文 2017-11-14 20:07 7606 Java/ SpringMVC/ MVC

在springmvc中注入服务时用@Service

当有两个实现类时都标明@Service后则会出现异常：

nested exception is org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type [com.james.dao.impl.BaseDao] is defined: expected single matching bean but found 2:

这是因为都标明了@Service会自动注入，这时会导致不清楚实际运行时实例化哪一类。

解决：

方法一

实际运用哪一个实现类就在哪个类上注入@Service，另外一个不标注

方法二

都不标注@Service，在resource文件夹中配置 applicationContext.xml，表明实际运行哪个实现类。

<bean id="serviceImpl" class="com.james.service.impl.ServiceImpl"></bean>

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