Which simple Java JPA ORM tool to use ?

Posted by Guillaume on Programmers See other posts from Programmers or by Guillaume
Published on 2010-11-16T15:00:30Z Indexed on 2012/09/07 9:49 UTC
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java

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orm

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jpa

What Java ORM library implementing JPA that match following criteria would you recommend and why ?

free & open source
alive (at least bug fixes and a mailing list)
with good documentation
simple (simpler than hibernate)

I need to select a simple ORM tool that can be set up in minutes, without too much configuration and easy to understand, for setting simple CRUD DAOs. A query builder will be an interesting plus. Later I can have to move to Hibernate, that's why being JPA compliant is a must.

I have found some candidates on the web, but not so much feedback, so I will gladly take your advices on the topic.

----- EDIT ---------
I have been successfully testing ebean/avaje with a small test cases. Any one has a feedback on using these tools in production ?

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