I have 5 levels hierarchy tables with OneToMany relationship constraints for example: (Country, City, School, Class and Student)
I create a search page for the lowest level (student) in the hierarchy with full CRUD choice which works fine.
My problem is on the Update, Create (Edit Page) for each student

On the UI I create a Select Box that holds the l upper level in the hierarchy (Class) just in order to connect the student to the tree.
It seems that it goes all the way up the tree to the top level and retrieves all the hierarchy data and it takes much too long.
i use hibernate as JPA vendor and it looks like automatic action.

What do I miss? Is it configuration problem?