Google Web Toolkit (GWT) + Google App Engine (GAE) + Detached Data Persistence

Question

I would like to develop a web-app requiring data persistence using GWT and GAE. As I understand it, my only (or at least by far the most convenient) option for data persiste

Answer 1

Currently, I use the DTO (DataTransferObject) pattern. Not necessarily as clean and plenty more boilerplate but GAE still requires a fair amount of boilerplate at current. ;)

I have a Domain Object mapped (usually) one-to-one with a DTO. When a client needs Domain info, a DAO(DataAccessObject) coughs up a DTO representation of the Domain object and sends that across the wire. When a DTO comes back, I hand the DAO the DTO which then updates all the appropriate Domain Objects.

Not as clean as being able to pass Domain Objects directly across the wire obviously but the limitations of GAE's JDO implementation and GWT's Serialization process means this is the cleanest way for me to handle this currently.