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From "Bernd Eckenfels (JIRA)" <>
Subject [jira] [Commented] (VFS-309) ThreadLocal memory leak in DefaultFileContent
Date Wed, 03 Dec 2014 07:30:42 GMT


Bernd Eckenfels commented on VFS-309:

Ah, need to provide a new version. This uses synchronized on the threadlocal creation for
no good reason, it cannot be concurrent by definition.

> ThreadLocal memory leak in DefaultFileContent
> ---------------------------------------------
>                 Key: VFS-309
>                 URL:
>             Project: Commons VFS
>          Issue Type: Bug
>    Affects Versions: 2.0
>         Environment: Tomcat servlet container
>            Reporter: jontro
>            Assignee: Bernd Eckenfels
>            Priority: Blocker
>             Fix For: 2.1
>         Attachments: close-on-close.patch, threadlocal_setNull_vs_remove_bug.patch
> When using commons vfs in a servlet container the ThreadLocal values stored will not
be released once the request finishes.
> There needs to be a method to clear these values otherwise the data will leak into the
next request.
> This was detected with tomcat 6.0.26. Upon undeploying an app that uses commons vfs tomcat
detects the leaks with a huge amount of the following messages:
> A web application created a ThreadLocal with key of type [java.lang.ThreadLocal] (value
[java.lang.ThreadLocal@52fb241d]) and a value of type [org.apache.commons.vfs.provider.FileContentThreadData]
(value [org.apache.commons.vfs.provider.FileContentThreadData@6600167a]) but failed to remove
it when the web application was stopped. To prevent a memory leak, the ThreadLocal has been
forcibly removed.

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