Re: Using Hibernate within a portlet

Ok, I was totally wrong. The whole problem hasn't to do anything with 
generics tomcat and so on.... Stupidity makes it a lot easier: I just 
didn't use my wonderfull HibernateUtil to close the session but closed 
it directly. Sorry!

Regards,
Andi

>
>
> you were right. The problem was in my HibernateUtil class. I tried to 
> get a session like this:
>
>    public static final ThreadLocal<Session> session = new 
> ThreadLocal<Session>();
>      public static Session currentSession() throws HibernateException {
>        Session s = session.get();
>        // If there is no session create one
>        if(s==null){
>            s = sessionFactory.openSession();
>            session.set(s);
>        }
>        return s;
>    }
>      public static void closeSession() throws HibernateException {
>        Session s = session.get();
>        if(s != null){
>            s.close();
>        }
>        session.set(null);
>    }
>
> After removing generics and adding the necessary casts it worked 
> (though I don't understand the difference yet).
>
> Regards,
> Andi
>
>> It seems to me that this is more of a hibernate problem than a pluto
>> problem.  really, getting hibernate to work within a portlet should be
>> no different than doing it within a webapp.
>>
>> Perhaps a stack trace and/or code snippet would help us get more 
>> specific.
>>
>>
>> David
>> On 12/3/05, Andreas Buechler <[email protected]> wrote:
>>  
>>
>>> Hi,
>>>
>>> in my portlet I'm trying to access the db over hibernate. Unfortunately
>>> this doesn't seem to be very reliable (at least how I configured 
>>> it...).
>>> After googeling a little I found out that the "Hibernate Reference
>>> Documentation v3.0.5"  isn't quite up to date and that you don't 
>>> have to
>>> use Tomcat's JNDI-bound JDBC connections anymore [2].
>>>
>>> My problem is now that it still doesn't work in a  reliable way. The
>>> symptoms are that if I access the portlet for the first time the db
>>> query is (mostly) successful. After that I get 
>>> NullPointerExceptions. To
>>> make sure it's not my hibernate code, I tried the same query in
>>> standalone application (without Tomcat/Pluto). It worked without any
>>> problems.
>>>
>>> Does anybody have a clue what's going wrong here? How did you get
>>> hibernate to work reliable within your portlet? Any hints or 
>>> suggestions
>>> are highly appreciated!
>>>
>>>
>>> [1] 
>>> http://www.hibernate.org/hib_docs/v3/reference/en/html/quickstart.html
>>> [2] http://www.hibernate.org/114.html
>>>
>>> Regards,
>>> Andi
>>>
>>>
>>>   
>>
>
>