I'm teaching a college course on mobile application development and would like to introduce my students to a REST framework for use with App Engine, to help them with data storage for the Android apps they're building. Could anyone recommend a Java REST framework for App Engine that meets the following criteria:
Must have:
Nice to have:
Not important:
From my web searching, Restlet looks best. Is there any other framework I should consider?
Jax-RS...Restlet was written before this but was modified to implement Jax-RS.