import net.sf.hibernate.*;
import net.sf.hibernate.cfg.*;

public class HibernateUtil {
  private static final SessionFactory sessionFactory;
  static {
    try {
      sessionFactory = new Configuration().configure().buildSessionFactory();
    }
    catch (HibernateException ex) {
      throw new RuntimeException("Exception building SessionFactory: " +
                                 ex.getMessage(), ex);
    }
  }

  public static final ThreadLocal session = new ThreadLocal();
  public static Session currentSession() throws HibernateException {
    Session s = (Session) session.get();
// Open a new Session, if this Thread has none yet
    if (s == null) {
      s = sessionFactory.openSession();
      session.set(s);
    }
    return s;
  }

  public static void closeSession() throws HibernateException {
    Session s = (Session) session.get();
    session.set(null);
    if (s != null) {
      s.close();
    }
  }
}

private static void reloadConfig()
    throws HibernateException
{
    sessionFactory = new Configuration().configure().buildSessionFactory();
}