public class Book {
@Id
@GeneratedValue
private int bookId;
private String name;
@OneToMany(mappedBy = "Book")
private List<Chapter> chapters;
}

public class Chapter {
@Id
@GeneratedValue
@ManyToOne
private int chapterId;
private String name;
@JoinColumn(name = "bookId")
private Book book;
}

{
"id" : "1"
"name" : "Alice in wonderland"
}

{
"id": "1",
"name" : "Down the Rabbit Hole"
}

{
"chapterId" : 1,
"name" : "Down the Rabbit Hole",
"bookId" : "1"
}

chapter = (Chapter) session.get( Chapter.class, chapterId );

{
"chapterId" : 1,
"name": "Down the Rabbit Hole",
"Book" : {
    "bookId" : "1",
     "name": "Alice in wonderland"
    }
}

{
"name" : "The Pool of Tears",
"bookId" : "1"
}

{
"name" : "The Pool of Tears",
"Book" : {
    "bookId" : "1",
    "name" : "Alice in wonderland"
    }
}