Build path is incomplete. Cannot find class file for org.springframework.aop.Advisor

初学spring，记录一下出现的错误

在写AOP的时候，出现了错误Build path is incomplete. Cannot find class file for org.springframework.aop.Advisor

解决办法：下载org.springframework.aop的jar文件

然后将zip文件解压，加入到path里面

错误解决。