Hibernate without Cfg file

public class ConfigurationClass
{
    private static SessionFactory sf;
    private static final Properties properties;

    static
    {
        properties = new Properties();
        properties.setProperty("hibernate.connection.driver_class", "oracle.jdbc.driver.OracleDriver");
        properties.setProperty("hibernate.connection.url", "jdbc:oracle:thin:@localhost:1521:xe");
        properties.setProperty("hibernate.connection.username", "sql");
        properties.setProperty("hibernate.connection.password", "sql");
        properties.setProperty("hibernate.show_sql", "true");
        properties.setProperty("hibernate.dialect", "org.hibernate.dialect.Oracle9Dialect");
        sf = new AnnotationConfiguration().setProperties(properties).addAnnotatedClass(Employee.class).buildSessionFactory();
    }

    private ConfigurationClass()
    {

    }

    public static SessionFactory getSessionFactoryObject()
    {
        if (sf != null)
        {
            return sf;
        }
        return new AnnotationConfiguration().setProperties(properties).addAnnotatedClass(Employee.class).buildSessionFactory();
    }

}