I wrote up some code with the help of Paul Sandoz last week in  
Grenoble, that makes it dead easy to serialise any object to rdf using  
Jersey. I wrote up detailed explanation of how it works here
http://blogs.sun.com/bblfish/entry/serialising_java_objects_to_rdf
There is a lot of course to do to make this industrial strenght.  
Perhaps some of you have ideas on how to proceed. Feedback welcome of  
course.
Henry
Home page: 
http://bblfish.net/