public abstract class GenericDAOJPA<T> implements IGenericDAO<T>
{
	@PersistenceContext(unitName = "BookStore")
	private EntityManager em;

	
	public EntityManager getEntityManager()
	{
		return em;
	}


	@Override
	public void create(T entity)
	{
		em.persist(entity);
	}
......................................

@Stateless(name="BookDAOJPA")
@LocalBean
@Local(IBookDAO.class)
public class BookDAOJPA extends GenericDAOJPA<Book> implements IBookDAO
{

................................
public List<Book> getBooks()
       {
                Session session = getEntityManager().unwrap(Session.class);
                
		Criteria crit = session.createCriteria(Book.class);
		crit.setFirstResult(1);
		crit.setMaxResults(10);
		@SuppressWarnings("unchecked")
		List<Book> results = crit.list();

		return results;
	}
.....................................
}

book1
book1
book2
book2
book3
book3
book4
book4
book5
book5

@Entity
@Table(name="books")
public class Book implements Serializable {
	private static final long serialVersionUID = 1L;

	@Id
	@GeneratedValue(strategy=IDENTITY)
	@Column(name="book_id")
	private int bookId;

	private String description;

	@Column(name="file_size")
	private int fileSize;

	@Column(name="pages_count")
	private int pagesCount;

	private String picture;

	private String title;

	private int year;

	//bi-directional many-to-many association to Author
	@ManyToMany(fetch = EAGER, cascade = { MERGE, DETACH, REFRESH, PERSIST })
	@JoinTable(name = "authors_books", joinColumns = { @JoinColumn(name = "book_id") }, 
	inverseJoinColumns = { @JoinColumn(name = "author_id") })	
private Set<Author> authors = new HashSet<Author>();
	//bi-directional many-to-one association to BookType
    @ManyToOne(fetch = EAGER)
	@JoinColumn(name="type_id")
	private BookType bookType;

..................{getters, setters}..................

select
        this_.book_id as book1_1_2_,
        this_.type_id as type8_1_2_,
        this_.description as descript2_1_2_,
        this_.file_size as file3_1_2_,
        this_.pages_count as pages4_1_2_,
        this_.picture as picture1_2_,
        this_.title as title1_2_,
        this_.year as year1_2_,
        authors2_.book_id as book1_1_4_,
        author3_.author_id as author2_4_,
        author3_.author_id as author1_2_0_,
        author3_.name as name2_0_,
        booktype4_.type_id as type1_0_1_,
        booktype4_.type as type0_1_ 
    from
        books this_ 
    left outer join
        authors_books authors2_ 
            on this_.book_id=authors2_.book_id 
    left outer join
        authors author3_ 
            on authors2_.author_id=author3_.author_id 
    left outer join
        book_type booktype4_ 
            on this_.type_id=booktype4_.type_id limit ?, ?|#]