Hibernate with C3PO connection pool

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>

	<groupId>HibernateConnectionPool</groupId>
	<artifactId>HibernateConnectionPool</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>HibernateConnectionPool</name>
	<url>http://maven.apache.org</url>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
	</properties>

	<dependencies>
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>3.8.1</version>
			<scope>test</scope>
		</dependency>
		<dependency>
			<groupId>org.hibernate</groupId>
			<artifactId>hibernate-core</artifactId>
			<version>5.2.6.Final</version>
		</dependency>
		<!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-c3p0 -->
		<dependency>
			<groupId>org.hibernate</groupId>
			<artifactId>hibernate-c3p0</artifactId>
			<version>5.2.8.Final</version>
		</dependency>


		<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<version>6.0.5</version>
		</dependency>
	</dependencies>
</project>

package com.kb.model;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name = "Employee")
public class Employee {
	@Id
	@GeneratedValue(strategy = GenerationType.AUTO)
	@Column(name = "id")
	private int id;
	
	@Column(name = "name")
	private String name;
	
	@Column(name="city")
	private String city;

	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 String getCity() {
		return city;
	}

	public void setCity(String city) {
		this.city = city;
	}
}

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
       "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
       "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">

<hibernate-configuration>

	<session-factory>

		<!-- Database connection properties -->
		<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
		<property name="connection.url">jdbc:mysql://localhost/javainsimpleway</property>
		<property name="connection.username">root</property>
		<property name="connection.password">root</property>

		<property name="hibernate.c3p0.min_size">5</property>
		<property name="hibernate.c3p0.max_size">30</property>
		<property name="hibernate.c3p0.timeout">120</property>
		<property name="hibernate.c3p0.max_statements">50</property>
		<property name="hibernate.c3p0.idle_test_period">2000</property>

		<!-- SQL dialect -->
		<property name="dialect">org.hibernate.dialect.MySQLDialect</property>

		<!-- Disable the second-level cache -->
		<property name="cache.provider_class">org.hibernate.cache.internal.NoCacheProvider</property>

		<!-- Echo all executed SQL to stdout -->
		<property name="show_sql">true</property>

		<!-- Format the generated Sql -->
		<property name="format_sql">true</property>

		<!-- Dont Drop and re-create the database schema on startup,Just update 
			it -->
		<property name="hbm2ddl.auto">update</property>

		<mapping class="com.kb.model.Employee" />

	</session-factory>

</hibernate-configuration>

package com.kb.db;

import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;

import com.kb.model.Employee;
import com.kb.util.HibernateUtil;

public class Main {
	public static void main(String[] args) {
		Transaction tx = null;
		try {
			// Get session factory using Hibernate Util class
			SessionFactory sf = HibernateUtil.getSessionFactory();

			// Get session from Sesson factory
			Session session = sf.openSession();

			// Begin transaction
			tx = session.beginTransaction();

			// Creating Employee record
			Employee employee = new Employee();
			employee.setName("John");
			employee.setCity("Newyork");

			session.save(employee);
			 try {
					Thread.sleep(20000);
				} catch (InterruptedException e) {
					e.printStackTrace();
				}

			tx.commit();
			session.close();
			System.out.println("successfully persisted all the Employee records");
		} catch (HibernateException e) {
			e.printStackTrace();
			tx.rollback();
		}
	}
}