CODEWITHSUNDEEP
jpajdo
user246160
user246160

Reputation: 1397

Difference between JPA and JDO?

want to develop my project on Google App Engine .I want to use google big table as database. For the database I have two options JPA and JDO. Will you guys please suggest me on it? Both are new for me and I need to learn them. So I will be focused on one after your replies.

Upvotes: 21

Views: 18516

Answers (5)

marklai
marklai

Reputation: 2040

Since you're using Data Nucleus, see their FAQ on JDO vs JPA. http://www.datanucleus.org/products/accessplatform_3_0/jdo_jpa_faq.html

DataNucleus AccessPlatform supports both JDO and JPA specifications of Java persistence. As such it has no "vested interest" in either technology, believing that it is for users to choose which they like best. There has been much FUD on the web about JDO and JPA, largely perpetrated by RDBMS vendors. This FAQ corrects many of these points

Upvotes: 12

Vladimir Vaschenko
Vladimir Vaschenko

Reputation: 576

JPA persists java objects to relational data via ORM, while JDO is more general specification for java object persistence. So using JDO will give you more freedom in storage implementation options for your objects.

Upvotes: 2

rockXrock
rockXrock

Reputation: 3453

Since GAE BigTable is not an RDBMS, JDO is a better choice. There are some detailed comparision articles in Aphache JDO, it is helpful for me.

Upvotes: 3

user1593165
user1593165

Reputation: 615

A key difference is that JDO support a rich domain model (logic together with data), in fact all persistent classes can have a reference to the current PersistenceManager, issue queries, and, I guess, it's possible not to have fields persistent by default.

JPA does not support such software design. In fact each Entity doesn't have a reference to the PersistenceManager, to have it you have to resort to ThreadLocal variables, which is not a very elegant and robust solution.

Upvotes: 4

Padmarag
Padmarag

Reputation: 7214

JPA is the leading java standard for persistence. So I'll say use JPA if you are using RDBMS and require ORM.
Hibernate is generally used as JPA implementation. If you need some extra features you can use hibernate specific annotations.

This question already looks to be discussed here JDO vs JPA for Java on Google App Engine

Upvotes: 2

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