Server dependencies on Servlets

[Andrew Toulouse]

I'd like to implement an OAuth2 provider on top of the Play framework (which 
does not use the Servlet API), but when I looked into using Amber, it looks 
like the Servlet API is a part of Amber at a pretty basic level. Not knowing 
anything about Amber (yet), how involved is it to refactor it to be 
servlet-agnostic?