Used by Spring's LocalSessionFactoryBean if told to not expose a
transaction-aware SessionFactory proxy. LocalSessionFactoryBean's default
is still SessionFactory proxying, though, mainly to remain compatible with
Hibernate 3.0 as well. Turn the "exposeTransactionAwareSessionFactory" flag
to "false" to expose the raw Hibernate 3.1 CurrentSessionContext mechanism.
This CurrentSessionContext implementation can be specified in custom
SessionFactory setup through the "hibernate.current_session_context_class"
property, with the fully qualified name of this class as value.