Author.java

package com.mehmetpekdemir.librarymanagementsystem.entity;

import java.util.HashSet;
import java.util.Set;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.ManyToMany;
import javax.persistence.Table;

import lombok.Getter;
import lombok.NoArgsConstructor;
import lombok.Setter;

@Getter
@Setter
@NoArgsConstructor
@Entity
@Table(name = "authors")
public class Author {

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

	@Column(name = "name", length = 100, nullable = false,unique = true)
	private String name;

	@Column(name = "description", length = 250, nullable = false)
	private String description;

	@ManyToMany(fetch = FetchType.LAZY, cascade = { CascadeType.PERSIST, CascadeType.MERGE , CascadeType.REMOVE}, mappedBy = "authors")
	private Set<Book> books = new HashSet<Book>();

	public Author(String name, String description) {
		this.name = name;
		this.description = description;
	}

}