onetomany mapping with example

@Entity

@Table(name = "AUTHOR")

public class Author {

       private long id;

       private String name;

       private String email;

      

       public Author() {

       }

                    

       public Author(String name, String email) {

              this.name = name;

              this.email = email;

       }

       @Id

       @Column(name = "AUTHOR_ID")

       @GeneratedValue(strategy=GenerationType.AUTO)

       public long getId() {

              return id;

       }

//setter/getter

}

@Entity

@Table(name = "BOOK")

public class Book {

       private long id;

       private String title;

       private String description;

       private Date publishedDate;

      

       private List<Author> author = new ArrayList<Author>();

       public Book() {

       }

       @Id

       @Column(name = "BOOK_ID")

       @GeneratedValue(strategy=GenerationType.AUTO)

       public long getId() {

              return id;

       }

       @Temporal(TemporalType.DATE)

       @Column(name = "PUBLISHED")

       public Date getPublishedDate() {

              return publishedDate;

       }

       @OneToMany(cascade = CascadeType.ALL)

       @JoinColumn(name = "BOOK_ID")

       public List<Author> getAuthor() {

              return author;

       }

//setter/getter

}

public class BooksTest {

       public static void main(String[] args) {

              SessionFactory sessionFactory = HibernateUtils.getSessionFactory();

              Session session = sessionFactory.openSession();

              try{

                     session.beginTransaction();

                    

                     // creates a Book entity

                     Book newBook = new Book();

                     newBook.setTitle("Pro PHP MVC");

                     newBook.setDescription("Php MVC Book");

                     newBook.setPublishedDate(new Date());

                     List<Author> authors= new ArrayList<Author>();

                     authors.add(new Author("Shambhu Kumar", "shambhu@gmail.com"));

                     authors.add(new Author("Ravi Kumar", "Ravi@gmail.com"));

                     newBook.setAuthor(authors);

                    

                     // persists the book entity

                     Long bookId = (Long) session.save(newBook);

                    

                     // gets the book entity back

                     Book book = (Book) session.get(Book.class, bookId);

                     System.out.println("Book's Title: " + book.getTitle());

                     System.out.println("Book's Description: " + book.getTitle());

                    

                    

                     book.getAuthor().add(new Author("Shambhu1", "shambhu@gmail.com"));

                     book.getAuthor().add(new Author("Ravi1", "Ravi@gmail.com"));

                    

                     session.update(book);

                     List<Author> authorsList = book.getAuthor();

                     for(Author author:authorsList){

                           System.out.println("Name: " + author.getName());

                           System.out.println("Mail: " + author.getEmail());     

                     }

                    

              }

             

              finally{

                     session.getTransaction().commit();

                     session.close();    

                     sessionFactory.close();

              }

             

                    

       }

}