Here I would like to share some knowledge about Struts2.0 , I came to learn this technology before sometimes back.There are lot of concepts which shapes struts framework to compete with other talented one like Django.
It has some more concepts for your mind:
7.OGNL Expressions(Object Grapical Navigational Language)
10.JSP & Bean classes
We should have to be good in above all.I am a starter on the above.Even I don’t know the knowledge about JSP.