Does anybody know where I can find an example of a class implementing
PropertyAccessor?

Hibernate 3.0:

Mapping documents:

Code between sessionFactory.openSession() and session.close():

Full stack trace of any exception that occurs:

PostgreSQL 8.0:

The generated SQL (show_sql=true):

Debug level Hibernate log excerpt:

Hibernate uses org.hibernate.property.BasicPropertyAccessor as default.
Look at its implementation for a start.