Book.java

package com.dangdang.mypp.domain;

import org.hibernate.annotations.Cache;
import org.hibernate.annotations.CacheConcurrencyStrategy;

import javax.persistence.*;
import javax.validation.constraints.*;
import java.io.Serializable;
import java.util.HashSet;
import java.util.Set;
import java.util.Objects;


/**
 * A Book.
 */
@Entity
@Table(name = "BOOK")
@Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
public class Book implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;

    @Column(name = "title")
    private String title;

    @ManyToOne
    private Author author;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public Author getAuthor() {
        return author;
    }

    public void setAuthor(Author author) {
        this.author = author;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }

        Book book = (Book) o;

        if ( ! Objects.equals(id, book.id)) return false;

        return true;
    }

    @Override
    public int hashCode() {
        return Objects.hashCode(id);
    }

    @Override
    public String toString() {
        return "Book{" +
                "id=" + id +
                ", title='" + title + "'" +
                '}';
    }
}