Difference between Struts 1 and Struts 2 Web Development Framework

I had worked previously on Struts 1 but never touched Struts 2, especially since Spring MVC was there to take the leading role. Recently one of my friends ask me to help with Struts2, which leads me to look on the Struts2 framework from start. First thing I wanted to find out differences between Struts 1 and Struts 2 framework, because in my experience, if you have worked in the previous version looking differences between two versions of Struts can quickly help to find, what changes and What are the new features, concepts and improvement is offered by Struts 2. Also the difference between Struts 1 and Struts 2 is a good candidate to include in my list of Struts interview questionsfor quick revision.
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