use Hibernate and HttpSession together

AndreyAndreev · **Posted:** Tue Sep 07, 2004 1:13 am

Hi, all

I'm using hibernate in my web app on jboss application server.
To avoid initialization delay (configuring, opening session, ect) on each jsp I save the object which encapsulated all hibernate data (HibernateLibBean) in HttpSession.

Code:

    public HibernateLibBean getHib(HttpSession http_ses, String str_connector, String str_ip) throws Exception
    {
        HibernateLibBean hib = (HibernateLibBean) http_ses.getAttribute(HIB_PROP_NAME); 
        
        try
        {
            if( hib == null )
            {
                        //this code executed only once
              hib = new HibernateLibBean();
              hib.sys_init(str_connector, str_ip);
              http_ses.setAttribute(HIB_PROP_NAME, hib);
            }
        }
        catch(Exception ex)
        {
            throw ex;
        }
        
        return hib;        
    }

and later on each jsp

Code:

HibernateLibBean hib = hib_loader.getHib(session,"connector_test.jar", request.getRemoteAddr() );

This brings me a very fast initialization.

HibernateLibBean has method finalize(). The purpose of this method is to close all hibernate connection with database.
It works, But i want to hear your comment.
Maybe exist a better solution for this problem.

Thanks for your comments.

Hibernate version: 2.1.4
Name and version of the database you are using: postgresql 7.3.6 RH

anthony · **Posted:** Tue Sep 07, 2004 3:40 am

Quote:

To avoid initialization delay (configuring, opening session, ect)

only building the sessionFactory is expensive, not getting a new hibernate session. SessionFactory must be a singleton... take a look at int() servlet filter for example.

2- HttpSession is not threadsafe, so if your client is hitting F5 many times under IE5, many thread will hit the hibernate session (stored in the httpSession) and it can be VERY dangerous.

Furthermore, with your strategy where is the sessionFactory, i just don't understand what is exactly done...

AndreyAndreev · **Posted:** Tue Sep 07, 2004 7:09 am

Thanks for your reply.

Can i solve that problem by mark HibernateLibBean's method as synchronized?
I think that makes all calling to hibernate session method - threadsafe. And only one copy of HibernateLibBean will be used in one HttpSession.

baliukas · **Posted:** Tue Sep 07, 2004 7:19 am

Do not do that, store hibernate session in java.lang.ThreadLocal instance.