ExceptionInInitializerError

This is my HibernateUtil file:

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package proyecto2.db;

import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;

/**
 *
 * @author pc
 */
public class HibernateUtil {

    private static final SessionFactory sessionFactory = buildSessionFactory();

    private static SessionFactory buildSessionFactory() {

        try {
            Configuration configuration = new Configuration();
            configuration.configure("hibernate.cfg.xml");//falta en el paréntesis
            ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder().applySettings(configuration.getProperties()).build();

            SessionFactory sessionFactory = configuration.buildSessionFactory(serviceRegistry);
            return sessionFactory;

        } catch (Throwable e){
            System.err.println("La creación del SessionFactory ha fallado");
            throw new ExceptionInInitializerError();
        }
    }

    /**
     * @return the sessionFactory
     */
    public static SessionFactory getSessionFactory() {
        return sessionFactory;
    }

}