Google Web Toolkit and Google App Engine With PhoneGap for Mobile Apps
To write Java EE server side code and Java client code that deploys to the cloud and serves thin, mobile and headless clients - I find Google Web Toolkit used within Eclipse that deploys to Google App Engine using a Google Cloud SQL instance works very well. If you go one step further and package your client HTML5/JS client code using PhoneGap for iOS and Android then you have a full end to end solution.
The following diagram illustrates various start and end points when developing thin or mobile clients.
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| Options for generating native, thin and hybrid mobile clients |
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| Sequence diagram for generating HTML5 based mobile apps from Java using GWT and PhoneGap |
Getting Started
I am interested in getting the JPA 2.0 provider working in Google App Engine. Unfortunately Google does not use the open source EclipseLink JPA 2.0 provider - instead it uses the DataNucleus provider.
There are a lot of differences and constraints on the JPA 2 provider - here are some of the highlights.
You must use the Key PK wrapper - which shares implementation with JDO
import com.google.appengine.api.datastore.Key[0] Nutrient (id=164) id Key (id=169) jdoDetachedState null jdoFlags 1 jdoStateManager JDOStateManager (id=171) name "aName" (id=178)
Software
Eclipse 3.8/4.2 with DTP, GWT
Google App Engine
PhoneGap/Cordova 2.4
Google App Services
Google Datastore using the paxos algorithm:
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