How I can add the work of flow to a developed project?

Version 1

Created by tuiyun on Dec 6, 2012 4:34 AM. Last modified by tuiyun on Dec 6, 2012 4:44 AM.

My project is based on spring mvc+hibernate+extjs4.1.Now it was completed.But I receive a new requirement now.The project need work of flow like approving.What can I do add the jbpm4 to my project.Please give me a useful way.Thanks!