Annotation-specified bean name 'userDaoImpl' for bean class [***] conflicts with existing, non-compatible bean definition of same name and class [***]

使用Spring开发的时候报错如下：

Caused by: org.springframework.context.annotation.ConflictingBeanDefinitionException: Annotation-specified bean name 'userDaoImpl' for bean class [cn.arebirth.impl.UserDaoImpl] conflicts with existing, non-compatible bean definition of same name and class [cn.arebirth.dao.impl.UserDaoImpl]

排错思想：

　　Spring Bean管理的对象名称相同了，也就是说有两个类的名字相同。