It would be oh-so-simple to move data between ROME and these beans in Jena.
So here is a jar of the source and binary files for concrete Java beans that represent the Atom RDF schema, have type-safe getters/setters, and will play nicely in Jena:
(In addition to the standard Jena jars, you’ll need the kazuki.jar as well. Get it here.)
If this proves useful to you, drop me a note and let me know. (I can’t support it in any way, however. Use it as a starting point for your own experiments.)
Note: I edited the original OWL schema file slightly to fix a couple of resource URIs. The resulting AtomSchema.rdf is in the jar. There may also be a couple of defined Datatype properties that are actually using Objects, according to the schema. I decided not to mess with those, so be on the lookout.