搭建SSH框架时出现错误

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'testService' defined in ServletContext resource [/WEB-
INF/applicationContext.xml]: Initialization of bean failed; nested exception is org.springframework.beans.TypeMismatchException: Failed to convert property value of type [com.test.impl.dao.Test2DAO] to required type [com.test.dao.ItestDao] for property 'testDao'; nested exception is java.lang.IllegalArgumentException: Cannot convert value of type [com.test.impl.dao.Test2DAO] to required type [com.test.dao.ItestDao] for property 'testDao': no matching editors or conversion strategy found


这是什么问题呢，怎么结局？各位高手麻烦给个答案
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