How do I map a nested collection, Map>, with hibernate JPA annotations?

Question

I have a class I am not sure how to annotate properly.

My goal for Holder::data:

• List should maintain order not by comparator but by the natural orde

Answer 1

Please note that the referred link to the Hibernate documentation seems out of date, I found the following working: http://docs.jboss.org/hibernate/core/3.5/reference/en/html/collections.html