Example of @BatchSize in Hibernate Annotation

package com.concretepage.persistence;
import java.io.Serializable;
import javax.persistence.Entity;
import javax.persistence.Id;
import org.hibernate.annotations.BatchSize;

@Entity
@BatchSize(size=2)
public class Country implements Serializable {
	private static final long serialVersionUID = 1L;
	@Id
	private int id;
	private String name;
	public Country(int id,String name){
		this.id=id;
		this.name=name;
	}
	public Country(){
	}
	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;
	}
	
}
 

package com.concretepage.util;

import java.util.List;

import org.hibernate.HibernateException;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.AnnotationConfiguration;

import com.concretepage.persistence.Country;

public class HibernateUtil {
	private static final SessionFactory concreteSessionFactory;
	    static {
	        try {
	            concreteSessionFactory = new AnnotationConfiguration()
	                    .configure().buildSessionFactory();
	        } catch (Throwable ex) {
	            throw new ExceptionInInitializerError(ex);
	        }
	    }
	    public static Session getSession()
	            throws HibernateException {
	        return concreteSessionFactory.openSession();
	    }
	    
	    public static void main(String... args){
	    	Session session=getSession();
	    	session.beginTransaction();
	    	for(int i=1;i<=4;i++){
	    		Country c = new Country(i,"A"+i);
		    	session.save(c);	
		    	if(i%2==0){
		    		session.flush();
		    		session.clear();
		    	}
	    	}
	    	session.getTransaction().commit();
	    	Query q=session.createQuery("from Country");
	    	List list= q.list();
	        for(Country ct:list){
	        	System.out.println(ct.getName());
	        }
	        
	        session.close();
	    }
	}