Is there an implementation of the ActiveRecord pattern in Java like the one from Ruby?

Question

I'd like to have a ActiveRecord implementation in Java and before crafting my own, I'd like to know if there is an open source implementation of it.

I am aware of other successful java OR maping tools like Hibernate, Castor, etc... and that is not what i want, i want a ActiveRecord like in RoR:

• RoR ActiveRecord
• .NET Castle ActiveRecord

Anyone?

Answer 1

Hibernate is an ORM framework in Java and based on JPA specifications. JPA (Java Persistent API) internally implements ActiveRecord Pattern at number of places. But overall JPA is based on bit complex pattern called as DataMapper.

You can refer to http://www.theserverside.com/tt/articles/article.tss?l=RailsHibernate for comparison between Rails ActiveRecord and Hibernate

Answer 2

You could also consider using ActiveRecord-JDBC running on JRuby: http://wiki.jruby.org/wiki/ActiveRecord-JDBC

I haven't done that myself, but I have had great success in using ActiveRecord's Migrations to manage schema migrations in a Hibernate based application.

Answer 3

After "Googling" for a answer I've found the project arjava. It implements the Active Record pattern kind of similar to the Ruby way.

Answer 4

I released this ActiveJDBC project: http://code.google.com/p/activejdbc/

This is an implementation of ActiveRecord in Java

Enjoy

Igor

Answer 5

Check out ActiveObjects, a more Rails-esque ActiveRecord then the other mappers: https://activeobjects.dev.java.net/