SSM框架编译错误Build path is incomplete

使用SSM框架搭建项目，编译始终报这个错误：Build path is incomplete. Cannot find class file for com/fasterxml/jackson/databind/ObjectMapper
在网上没查到解决方案，求助大神啊！

http://blog.csdn.net/fanfan199312/article/details/46228531