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From "Martin Gainty" <mgai...@hotmail.com>
Subject Re: Tomcat 4.1.31, Weird problem. Once in a while an attribute in the session is not found... look like a RACE?! Is that possible????
Date Mon, 19 Dec 2005 14:12:46 GMT
Good Morning David-

What does the log say?

Martin-
----- Original Message ----- 
From: "David Gagnon" <dgagnon@siunik.com>
To: "Tomcat Users List" <users@tomcat.apache.org>
Sent: Monday, December 19, 2005 7:40 AM
Subject: Tomcat 4.1.31, Weird problem. Once in a while an attribute in the session is not
found... look like a RACE?! Is that possible????


> Hi all,
> 
> I have a really wreird problem. I have a web site and I get a
> NullPointerException once in a while because the
> WcPresentationConstants.CURRENT_RESOURCE is null.
> 
> UkResource resource = (UkResource)
> param.request.getSession().getAttribute(WcPresentationConstants.CURRENT_RESOURCE);
> 
> 
> But this code arrive just after the user logs in. And just after we set
> the attribute. This error occurs every 3 or 4 weeks and I cannot
> reproduce it (So 99% of the time everything works just fine). This code
> is always run just after the user log in so there is no user interaction
> involved. If the error occurs I have a bug report sent and I print the
> object in the report. In the last bug the Attribute was in the REPORT
> ?!?! (I remeber have seen a report where the same attribute was null).
> For me it`s look like a race .. but all occurs in the same thread.
> 
> Is tomcat can do copy of session object behind de scene.. (maybe becaus
> of session reload ???) or is there anything in tomcat that can explain
> this (If yes, how can I avoid it )? I just don`t get it I chasing this
> bug for months now ...
> 
> Thanks for your help
> 
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