Hello

in the hibernate reference documentation
chapter 27 "Best practices"

we read in the section"Consider abstracting your business logic from Hibernate:"

Hide Hibernate data-access code behind an interface. Combine the DAO and Thread Local
Session patterns. You can even have some classes persisted by handcoded JDBC associated
to Hibernate via a UserType.

I do not understand the usage of UserType because I may be wrong but UserType are useful for unusual mapping between POJO fields and database columns
so why the documentation recommend it for classes persisted by handcoded JDBC ?

Thank you for any explanation