I just created and published a JPA module for Dropwizard. I basically reworked Dropwizard Hibernate to expose a shareable, thread-safe EntityManager that works with the UnitOfWork annotation. Setup and configuration is almost identical to that for Dropwizard Hibernate. So far I've only published releases compatible with Dropwizard 0.9.0 - 0.9.3. I'd like to get some feedback on the project before releasing a 1.0 milestone compatible with Dropwizard 1.0.0. If you have the interest and time to check it out I'd appreciate any thoughts or feedback you might have.
Github: https://github.com/scottescue/dropwizard-entitymanager
User Guide: http://scottescue.com/dropwizard-entitymanager/