I'm in the middle of configuring and choosing my architecture components for my GWT based we application. I have to choose a simple way to persist my data model on the target server which is Google-App-Engine.
Contestants:
Spring Roo: I've tried this and integrated it in my project and it's pretty nice. Seem to be simple to use and the java AspectJ ITD seem a very cool tech to assist me in generating and persisting my entities. For now it only works with JPA so, not really exploiting DataStore real potential (RDBMS only :(
Objectify: Not tried this one yet but it seems great to address directly the Google DataStore API. No fuzzle with JDO. I checked sample usage and it looks very nice too.
Does any experienced guy has an opinion?
Thank you!
I created an unpublished Roo add-on which used Twig for GAE persistence. Twig is fantastic, there is almost no configuration and problems really only arose when I over-configured things. The problem with JPA on GAE is that it is only JPA 1.0 and it the Datanucleus plugin for GAE is sketchy at best.
If I were solely targeting GAE I would be using Twig or Objectify. If your interested I can publish my Twig add-on as Google Code project.