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https://issues.apache.org/jira/browse/SHIRO-159?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12867402#action_12867402
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Kalle Korhonen commented on SHIRO-159:
--------------------------------------

Yeah, it gets complicated quickly if we want to do anything more. I'd say close 
for now and we'll enhance later if somebody comes up with a decent proposal.

> ThreadLocal is not cleared upon the unloading of the webapp and the SHiro 
> Servlet
> ---------------------------------------------------------------------------------
>
>                 Key: SHIRO-159
>                 URL: https://issues.apache.org/jira/browse/SHIRO-159
>             Project: Shiro
>          Issue Type: Bug
>          Components: Integration: JEE
>    Affects Versions: 1.0.0
>         Environment:  Model Name:     MacBook Pro
>   Model Identifier:   MacBookPro5,1
>   Processor Name:     Intel Core 2 Duo
>   Processor Speed:    2.8 GHz
>   Number Of Processors:       1
>   Total Number Of Cores:      2
>   L2 Cache:   6 MB
>   Memory:     4 GB
>   Bus Speed:  1.07 GHz
>  System Version:      Mac OS X 10.6.3 (10D573)
>   Kernel Version:     Darwin 10.3.0
>  
>            Reporter: david e. berry
>             Fix For: 1.0.0
>
>
> Tomcat 6.0.26 reports a severe error when unloading a web app that uses 
> org.apache.shiro.web.servlet.IniShiroFilter
> SEVERE: A web application created a ThreadLocal with key of type [null] 
> (value [org.apache.shiro.util.threadcontex...@c0c66a]) and a value of type 
> [java.util.HashMap] (value [{}]) but failed to remove it when the web 
> application was stopped. To prevent a memory leak, the ThreadLocal has been 
> forcibly removed.
> May 13, 2010 9:29:51 PM org.apache.catalina.loader.WebappClassLoader 
> clearThreadLocalMap

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