GroupAddProductTest.java

package com.test.jpa;

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;

public class GroupAddProductTest {
	
	public static void main(String[] args) {

		EntityManagerFactory factory = Persistence.createEntityManagerFactory("JPATest");

		EntityManager entityManager = factory.createEntityManager();
		
		entityManager.getTransaction().begin();
		
		Group group=new Group();
		group.setName("Bayram");
		
		Product product1=entityManager.find(Product.class, 2); //bilgisayar
		Product product2=entityManager.find(Product.class, 4); //itü
		
		group.getProducts().add(product1);
		group.getProducts().add(product2);
		
		entityManager.persist(group);
		
		entityManager.getTransaction().commit();

		entityManager.close();

		factory.close();

	}

}