Java Data Objects (JDO)

Reading: http://java.sun.com/developer/technicalArticles/J2SE/jdo/
The JDO Programming Model
The Development Life Cycle: Using JDO in Your Applications


JDO as part of Google App Engine (GAE):
https://developers.google.com/appengine/docs/java/datastore/jdo/overview

Lifecycle of GAE datastore writes:
https://developers.google.com/appengine/articles/life_of_write