Group.java

package com.test.jpa;

import java.util.ArrayList;
import java.util.List;

import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.JoinTable;
import javax.persistence.ManyToMany;
import javax.persistence.Table;

@Entity
@Table(name="groups")
public class Group {
	
	@Id
	@GeneratedValue(strategy=GenerationType.AUTO)
	private int id;
	
	private String name;
	
	@ManyToMany(fetch=FetchType.EAGER)
	@JoinTable(name="group_product",
		joinColumns=@JoinColumn(name="group_id", referencedColumnName="id"),
		inverseJoinColumns=@JoinColumn(name="product_id", referencedColumnName="id")
	)
	private List<Product> products=new ArrayList<>();
	
	public int getId() {
		return id;
	}

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

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public List<Product> getProducts() {
		return products;
	}

	public void setProducts(List<Product> products) {
		this.products = products;
	}

}