[jbossseam-issues] [JBoss JIRA] Commented: (JBSEAM-2436) Session-scoped SFSB which holds entities leaks memory

Susanne Jarl (JIRA) jira-events at lists.jboss.org
Fri Mar 14 14:29:28 EDT 2008

    [ http://jira.jboss.com/jira/browse/JBSEAM-2436?page=comments#action_12402994 ] 
Susanne Jarl commented on JBSEAM-2436:

This is not a production issue from my own written code. I would never post them in JIRA, I really investigate and think a lot before I post here. I also posted in the forum first but no one answered. But maybe I could have stripped my code a bit from stuff that is not interesting but the first time I posted I didn't know exactly what was the problem. 

I think I discovered a very general serious bug and i reported here in JIRA. If I try to explain it again it goes like this.

If you have a session-scoped SFSB which holds entites, the entities does not get destroyed. So in production where many instances of the SFSB is created this leads to OutOfMemoryException IF the session timeout is not set to 2 minutes, because then the instances will be destroyed(!). 

I have investigated this for many many hours and watched the number of entities just growing (although I saw some instances got removed if I checked the number of instances really often but just a few ). I tried different solutions in my code but it was the exactly same result as long as I had the SFSB in session scope and the setting for Session Timeout more than 2 minutes. 

I really think you should look into this because it is a really serious bug. I hade to rewrite all my code not to use SFSB in session scope. Hopefully Antoine Sabot-Durand will provide you some useful code. Otherwise you could use mine, but you may strip it from all stuff that is not intresting. I could help with that as well but I can't really test this since I don't have any environment set up for load testing. If there is any other information or help I can provide please tell me.

> Session-scoped SFSB which holds entities leaks memory
> -----------------------------------------------------
>                 Key: JBSEAM-2436
>                 URL: http://jira.jboss.com/jira/browse/JBSEAM-2436
>             Project: JBoss Seam
>          Issue Type: Bug
>          Components: EJB3
>    Affects Versions: 2.0.0.GA
>         Environment: Suse Linux, JBoss 4.2.2.GA, Java 1.6.03, PostgreSQL 8.2
>            Reporter: Susanne Jarl
>         Assigned To: Pete Muir
>             Fix For: 2.1.0.GA
> Session-scoped SFSB which has entities in an object does not get destroyed. It leads to memory leak  in production. Please read: http://www.jboss.org/index.html?module=bb&op=viewtopic&t=126542
> The problem appeared after upgrading to Seam 2.0.0.GA. My code worked fine in Seam 1.2.1. 

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