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From Remy Maucherat <>
Subject Re: DO NOT REPLY [Bug 36541] - session getAttribute/setAttribute and removeAttribute are NOT Thread safe.
Date Wed, 07 Sep 2005 23:26:16 GMT wrote:
> ------- Additional Comments From  2005-09-08 01:08 -------
> I wonder if the new java.util.concurrent classes could be used instead 
> of simple HashMap?
> but that would mean total dependence on j2se 1.5 and that would be a 
> problem for supporting j2se 1.4, though a backport is being worked on here
> other reading here:  
> I think that sort of thing would provide a nice solution for speed + 
> reliability.  Using this as the underlaying base would/should fix issues with EL
> access too.

This would be a bad solution, because there are too many writes in many 

 From what I see, the regular HashMap.get will return null without 
further trouble (since that is all that is needed) as long as no resize 
occurs. This makes the problem fixable by creating a non resizable 
HashMap. Another possibility, which I consider very likely, is that 
concurrent resizes are the only problem, and in that case syncing only 
on writes is already enough.


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