table-per-hierarchy

How to get all objects of concrete class in table-per-hierarchy with hibernate?

How to get all objects of concrete class in table-per-hierarchy with hibernate?
I'm developing a web application with Netbeans (Maven Web Application) using Spring MVC and Hibernate. I have an abstract class (User) with multiple concrete classes (Parent, Child, etc.). I chose for a table-per-hierarchy construction so that I have
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