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https://issues.apache.org/jira/browse/LOGGING-108?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Simon Kitching closed LOGGING-108.
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    Resolution: Won't Fix

As no responses were received on my last comment, closing as wontfix 
(tomcat/jasper issue, not JCL issue).

> Classloader reference leak on Tomcat 5.5.17 with log4j in webapp
> ----------------------------------------------------------------
>
>                 Key: LOGGING-108
>                 URL: https://issues.apache.org/jira/browse/LOGGING-108
>             Project: Commons Logging
>          Issue Type: Bug
>    Affects Versions: 1.1.0
>         Environment: JDK 1.5.0_07, Tomcat 5.5.17
> commons-logging-api-1.1.jar is configured for the Tomcat bootstrap
> commons-logging-adapters-1.1.jar is deployed with a webapp
> log4j-1.2.11 is deployed with webapp
> This is the configuration specifically described in the release notes for 1.1:
> " New jar file commons-logging-adapters-xxx.jar is now provided. This can be
>   used to resolve class cast conflicts where parts of commons-logging are
>   deployed via different classloaders. It is not expected to be frequently
>   used; it is only necessary in situations where a container has deployed
>   commons-logging-api.jar and a webapp wants to bind to a third-party
>   logging implementation such as log4j. In this case, the webapp can
>   experience problems if it deploys commons-logging.jar as this causes
>   duplicates of the core commons-logging classes, but commons-logging-adapters
>   can be safely used."
>            Reporter: Taras Tielkes
>         Attachments: path.gif
>
>
> Some Tomcat Jasper implementation classes are initialized (that mean static 
> fields and static initializer) when the current thread has the webapp 
> classloader set as the context classloader.
> An example of this is org.apache.jasper.runtime.PageContextImpl
> If the first JSP page rendered on a freshly started Tomcat 5.5.17 is for a 
> webapp that contains the configuration described in the "Environment" section 
> above, a leak will occur:
> The class PageContextImpl (loader by CL above Webapp classloader in 
> delegation chain) stays loaded for the duration of the JVM
> The "log" field in this class refers to a class loaded from a 
> WebappClassloader.
> This produces a classloader reference leak to the webapp, even after 
> undeployment.

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