What does an underscore concatenated to a class name mean?

Question

I was reading the \"Dynamic, typesafe queries in JPA 2.0\" article and stumbled upon this example:

EntityManager em = ...
CriteriaBuilder qb = em.getCriteriaBuil         


        

Answer 1

I found this way to declare the metamodel in this article.

/**
 * A  meta model class used to create type safe queries from person
 * information.
 * @author Petri Kainulainen
 */
@StaticMetamodel(Person.class)
public class Person_ {
    public static volatile SingularAttribute lastName;
}