What are my options for frameworks for creating high performance web services using Scala, without too much fat? I am a total newbie at Scala and IntelliJ IDEA, and I'm looking at it for some future development -- for now, I'm in learning mode, and I've managed to get things working with the Play 2.0 framework, but not appropriate for my needs.
Coming from ruby's Sinatra, I found Scalatra, but honestly I got totally confused at trying to get it to work with INtelliJ IDEA 12 on Windows. Is there a tutorial that would help me create a debuggable Scalatra project in this IDE, on Windows? The instructions here (http://www.scalatra.org/2.2/getting-started/ide-support.html) left me needing more -- I don't even fully understand where scalatra fits into those instructions. Or how I go from those instructions to creating an actual project and run configuration.
Are there other frameworks like Scalatra (in spirit) I could use, if I do not need to do any UI work for now?