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https://issues.apache.org/jira/browse/MYFACES-4225?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17070322#comment-17070322
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Thomas Andraschko commented on MYFACES-4225:
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[~christian.beikov] would you like to provide a PR?
> [perf] Negative-Cache whether a file exists in ExternalContextResourceLoader
> ----------------------------------------------------------------------------
>
> Key: MYFACES-4225
> URL: https://issues.apache.org/jira/browse/MYFACES-4225
> Project: MyFaces Core
> Issue Type: Improvement
> Affects Versions: 2.2.11
> Reporter: Christian Beikov
> Priority: Major
>
> I'm seeing many {{sun.nio.fs.UnixException}} being thrown in the underlying
> code because {{ExternalContextResourceLoader.libraryExists}} calls
> {{ExternalContext.getResource}} which in the end checks if a file exists on
> the FS. I'd suggest when the project stage is PRODUCTION, this should be
> cached. Maybe this could be done by installing an {{ExternalContextWrapper}}
> that caches all resource lookups? I just see that parsing a XHTML causes many
> exceptions to be thrown internally which negatively affects performance.
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