I deployed webservices with tomcat6/axis2 using hibernate.
I used a standard HibernateUtil class to provide the SessionFactory.
Nevertheless, I had a memory leak due to the ThreadLocal within .

Then I rewrote another one to be worked in multithreading environment.

Do you think it is a good way to proceed ?

package com.cambyze.myLibrary.hibernate;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

public class HibernateUtil {

public static final Log log = LogFactory.getLog(HibernateUtil.class);

private static final SessionFactory sessionFactory = buildSessionFactory();

private static Session session; // current session to be used for every
// clients

private static int nbClients = 0; // Number of clients using the current
// session

private static SessionFactory buildSessionFactory() {
try {
// Create the SessionFactory from hibernate.cfg.xml
return new Configuration().configure().buildSessionFactory();
} catch (Throwable ex) {
// Make sure you log the exception, as it might be swallowed
System.err.println("Initial SessionFactory creation failed." + ex);
throw new ExceptionInInitializerError(ex);
}
}

public static SessionFactory getCurrentSessionFactory() {
if (session == null) {
log.debug("getSessionFactory Factory open ?" + !sessionFactory.isClosed());

} else {
log.debug("getSessionFactory Factory open ?" + !sessionFactory.isClosed() + "Session open ? : " + sessionFactory.getCurrentSession().isOpen());
}

return sessionFactory;
}

public static synchronized void OpenSession() {
if (nbClients == 0) {
log.debug("Open session for the 1st client / Factory open ?" + !sessionFactory.isClosed());
session = sessionFactory.openSession();
}
nbClients++;
log.debug("Nb clients : " + nbClients);
}

public static Session getCurrentSession() {
if (session == null) {
log.debug("SEVERE no instance of session / Factory open ?" + !sessionFactory.isClosed());
session = sessionFactory.openSession();

} else {
log.debug("getSessionFactory Factory open ?" + !sessionFactory.isClosed() + "Session open ? : " + session.isOpen());
}
return session;
}

public static synchronized void CloseSession() {
nbClients--;
if (session == null) {
log.debug("Session already closed");
} else
session.close();
session = null;
}

}