Based on the demos and documentation, OpenXava looks very impressive framework for quickly building an RIA from a Java domain. If it's really as good as it claims, why isn't it more well known?
I'd like to hear from people with practical experience of using OpenXava. What are it's strengths and weaknesses? How does it compare with alternatives such as Grails, Roo, and the Play framework?
If you choose to use openxava then you have to choose a portal server in which to deploy it. That's the complicated part, portals are very heavy.