GAE Remote API or GWT’s RequestFactory?

[Rafael Dipold]

Hi,

I want to build an software financial control that's uses infraestrutura of GAE to data and logic tier.
In the presentation tier I would like to use the JavaFX technology.
My doubt is with relation the comunication between the presentation and logic tier.
I read and tested two technology in a single CRUD app and both work's fine:

• Remote API
• GWT’s RequestFactory

The Remote API is more simple but I'm not sure if I understand the best use for this toolset. I read in Nick Johnson blog's that is intended purely for administrative access, but it work's fine in a single CRUD test that I created.
What technology you advises to build data-oriented (CRUD) software like I described??

Second question is with the fact that's in my country there are a federal law that forces the offline access of any software that's issue receipt for sale to consumers.

There are anyway to do with that there are replication/synchronization between a local db like mysql and the datastore in GAE infrastruture?
I read about AppRocket but I'm not sure if this delivers what it promises. Anybody has a suggestion about this?

I'm open to new ideas and appreciate any sugestion.

Kind regards,

Rafael Dipold