Do Domain Classes usually get JPA or JAXB Annotations or both?

Question

I have a Java enterprise application that provides a web service, has a domain layer, and a hibernate persistence layer. In this particular case, there is not a huge differ

Answer 1

I agree that using the same model classes is the right approach. If you are concerned about annotation clutter, you could use a JAXB implementation (such as EclipseLink JAXB) that provides a mechanism for externalizing the metadata:

• http://wiki.eclipse.org/EclipseLink/Examples/MOXy/EclipseLink-OXM.XML

Also since you are using a JPA model EclipseLink JAXB (MOXy) has extensions for making this easier:

• http://bdoughan.blogspot.com/2010/07/jpa-entities-to-xml-bidirectional.html
• http://wiki.eclipse.org/EclipseLink/Examples/MOXy/JPA

Here is an example of using one model with JAXB & JPA to create a RESTful service:

• Part 1 - The database
• Part 2 - JPA entities
• Part 3 - Mapping entities to XML using JAXB
• Part 4 - The RESTful service
• Part 5 - The client