Jspwiki servlet version

[Thành Duy]

Dear dev team!

I am using jspwiki 2.11.3. It seem servlet 4.0, right? I want downgrade to
3.0. Can I downgrade without problem?

Thank you!!!
-- 
*FullName: Nguyễn Duy Thành.*
*Shool: ĐHKHTN.*