Book.java

@Entity
public class Book {

	@Id
	@GeneratedValue(strategy = GenerationType.AUTO)
	@Column(name = “id”, updatable = false, nullable = false)
	private Long id;

	@OneToMany(mappedBy = “book”)
	private List reviews = new ArrayList();

	…
}

HelperMethod.java

@Entity
public class Book {

	…

	public void addReview(Review review) {
		this.reviews.add(review);
		review.setBook(this);
	}

	…
}

PersistEntities.java

Book b = em.find(Book.class, 1L);

Review r = new Review();
r.setComment(“This is a comment”);
r.setBook(b);

b.getReviews().add(r);

em.persist(r);

ReadEntity.java

b = em.find(Book.class, 1L);

List reviews = b.getReviews();
Assert.assertEquals(b, reviews.get(0).getBook());

Review.java

@Entity
public class Review {

	@Id
	@GeneratedValue(strategy = GenerationType.AUTO)
	@Column(name = “id”, updatable = false, nullable = false)
	private Long id;

	@ManyToOne
	@JoinColumn(name = “fk_book”)
	private Book book;

	…
}