StackOverflowError thrown when C3P0 jars are added

Question

I'm writing simple app using Hibernate. I have hibernate.cfg.xml file as follows:

<!DOCTYPE hibernate-configuration SYSTEM
    "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
    <property name="hibernate.connection.driver_class">
        com.mysql.jdbc.Driver
    </property>
    <property name="hibernate.connection.url">
        jdbc:mysql://localhost:3306/demo
    </property>
    <property name="hibernate.connection.username">root</property>
    <property name="hibernate.connection.password">1234</property>
    <property name="hibernate.dialect">
        org.hibernate.dialect.MySQLDialect
    </property>



<!-- Use the C3P0 connection pool provider -->
    <property name="hibernate.c3p0.min_size">5</property> 
    <property name="hibernate.c3p0.max_size">20</property> 
    <property name="hibernate.c3p0.timeout">300</property> 
    <property name="hibernate.c3p0.max_statements">50</property> 
    <property name="hibernate.c3p0.idle_test_period">3000</property>

    <!--List of XML mapping files -->
    <mapping class="www.Message"/>
</session-factory>
</hibernate-configuration>

and retrieve SessionFactory object as follows:

//in HibernateUtil.class
  SessionFactory sessionFactory;
  Configuration configuration=new 
                             Configuration().configure("hibernate.cfg.xml");
   sessionFactory=configuration.buildSessionFactory();`

And everything works fine until I add C3P0 jars:

• c3p0-0.9.5.2.jar
• hibernate-c3p0-5.2.14.Final.jar
• mchange-commons-java-0.2.11.jar

After adding jars above, the app throws StackOverflowError.

Here's my main App class:

package www;

import org.hibernate.Session;
import utils.HibernateUtil;
import java.util.List;

public class HelloWorld {
    public static void main(String[] args) {
        Session session = null;
        try {
            session = HibernateUtil.getSessionFactory().openSession();
            session.beginTransaction();
            session.save(new Message("Hello Denmark!"));
            session.getTransaction().commit();
            session.close();
            System.out.println("Message saved...");
            session = HibernateUtil.getSessionFactory().openSession();
            session.beginTransaction();

            List messages = session.createQuery("from Message m order by m.text 
asc").list();
            System.out.println("Messages found:"+messages.size());
            for (Object mes: messages) {
                Message message = (Message) mes;
                System.out.println(message.getText());
            }
            session.getTransaction().commit();
            session.close();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (session != null) session.close();
        }
    }
}

Any help would be appreciated.