JDO vs JPA for Java on Google App Engine

Question

I want to develop my project on Google App Engine with Struts2. For the database I have two options JPA and JDO. Will you guys please suggest me on it? Both are new for me a

Answer 1

Neither!

Use Objectify, because is cheaper (use less resources) and is faster. FYI: http://paulonjava.blogspot.mx/2010/12/tuning-google-appengine.html

Objectify is a Java data access API specifically designed for the Google App Engine datastore. It occupies a "middle ground"; easier to use and more transparent than JDO or JPA, but significantly more convenient than the Low-Level API. Objectify is designed to make novices immediately productive yet also expose the full power of the GAE datastore.

Objectify lets you persist, retrieve, delete, and query your own typed objects.

@Entity
class Car {
    @Id String vin; // Can be Long, long, or String
    String color;
}

ofy().save().entity(new Car("123123", "red")).now();
Car c = ofy().load().type(Car.class).id("123123").now();
ofy().delete().entity(c);