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https://issues.jboss.org/browse/JBSEAM-5143?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13025866#comment-13025866
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Robert Becker commented on JBSEAM-5143:
---------------------------------------

I migrated the application to run on JBoss AS 7.1.3 (also with Mojarra 2.1.29) 
and so far did not encounter the exception or anything related - Fingers 
crossed that this was not only by chance. I will change the production 
deployment this evening to JBoss AS and hopefully can confirm that this "fixed" 
the issue.

Perhaps the latest Mojarra caused some issue together with glassfish, but fixes 
so many things on the other side, that I do not want to revert to older 
versions.

> Random IllegalArgumentException: Stack must not be null
> -------------------------------------------------------
>
>                 Key: JBSEAM-5143
>                 URL: https://issues.jboss.org/browse/JBSEAM-5143
>             Project: Seam 2
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 2.3.1.Final
>            Reporter: Robert Becker
>
> Since upgrading to Seam 2.3 with Mojarra 2.1.29 on glassfish v3 from Seam 
> 2.2.2, I get random IllegalArgumentExceptions with the message "Stack must 
> not be null". The application worked fine for several years until now.
> The full stack trace is listed here: http://pastebin.com/RjLndvnE
> The exception randomly happens (in about 1 of 500 requests) when navigating 
> between pages, submitting forms, switching (RichFaces) tabs and so on.
> I believe restarting glassfish and/or enabling client side state saving 
> reduces the frequency of the issue whereas it seems to happen more often 
> after multiple successive redeployments during development.  Sadly, due to 
> several dependencies this is already in production but happens far less often 
> there, but it still happens daily according to the server logs.
> I have also posted this on stackoverflow 
> (http://stackoverflow.com/questions/27107870/seam-2-3-illegalargumentexception-stack-must-not-be-null)
>  but have not received any answers yet.
> Besides Seam 2.3, the following libraries are used:
> - Mojarra 2.1.29
> - RF 4.5 (exception also occurred with 4.3.x)
> - Omnifaces 1.10RC1 (will upgrade to 2.0)
> - Primefaces 5.1



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