WSDL, JAX-WS, WS-AT, Hibernate

I am new to alot of this. As I peruse the internet, is it true that I can have a client running a Hibernate transaction against a database, and have a JAX-WS call that uses WS-AT which particpates in that parent transaction, and would rollback if the transaction were rolled back? That seems to be what the articles I am reading imply, but I don't seem to find a decent example showing a client test class running a transaction, calling a web service that participates. I misunderstood what JEST was, thinking it would do something like what I am after for REST services, but instead it seems to just be a scheme for managing transactions within a REST service.

So can someone set me straight on if I am going down the right path towards having transactional integrity while using web services? And maybe a pointer to a good example would be good.