Author.java

@Entity
public class Author implements Serializable {
	@Id
	@GeneratedValue(strategy = GenerationType.AUTO)
	@Column(name = "id", updatable = false, nullable = false)
	private Long id;
	
	@Version
	@Column(name = "version")
	private int version;

	@Column
	private String firstName;

	@Column
	private String lastName;
	
	@ManyToMany(mappedBy="authors")
	private Set<Book> books = new HashSet<Book>();
	
	...
}

Author_.java

@Generated(value = "org.hibernate.jpamodelgen.JPAMetaModelEntityProcessor")
@StaticMetamodel(Author.class)
public abstract class Author_ {

	public static volatile SingularAttribute<Author, String> firstName;
	public static volatile SingularAttribute<Author, String> lastName;
	public static volatile SetAttribute<Author, Book> books;
	public static volatile SingularAttribute<Author, Long> id;
	public static volatile SingularAttribute<Author, Integer> version;

}

Criteria.java

CriteriaBuilder cb = this.em.getCriteriaBuilder();

// create the query
CriteriaQuery<Author> q = cb.createQuery(Author.class);

// set the root class
Root<Author> a = q.from(Author.class);

// use metadata class to define the where clause
q.where(cb.like(a.get(Author_.firstName), "J%"));

// perform query
this.em.createQuery(q).getResultList();

EntityGraph.java

// create the entity graph
EntityGraph graph = this.em.createEntityGraph(Author.class);
// use metadata class to define the subgraph
Subgraph<Book> bookSubGraph = graph.addSubgraph(Author_.books);

// perform query
List<Author> authors = this.em
				.createQuery("SELECT DISTINCT a FROM Author a", Author.class)
				.setHint("javax.persistence.fetchgraph", graph).getResultList();

pom.xml

...

<dependencies>
	<dependency>
		<groupId>org.hibernate</groupId>
		<artifactId>hibernate-jpamodelgen</artifactId>
	</dependency>
</dependencies>

...