JPA Objects is a sister project to the Naked Objects framework, providing an implementation of an RDBMS Object Store.
The diagram below shows how JPA Objects relates to the Naked Objects framework, in terms of the hexagonal architecture.
There are a number of other sister projects; for details see the Star Objects umbrella project.
This site contains a users' guide to get you started, describing for example how to annotate the domain model using JPA annotations, and how to configure Hibernate, the underlying JPA provider implementation.
JPA Objects distributed using Maven, downloadable from the Maven repo hosted at the Star Objects umbrella project.
If you are interested in contributing enhancements or bug fixes, please see the developers guide.