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https://issues.apache.org/jira/browse/SLING-2353?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13186782#comment-13186782
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Felix Meschberger commented on SLING-2353:
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> However, the question is if we keep the current check or rely on recursion 
> detection. currently a <sling:include/> would not be allowed

I'd remove the check and rely on recursion detection (see also Tobias' comment 
above)
                
> Prevent <sling:include resource="<%= null %>" /> to include itself
> ------------------------------------------------------------------
>
>                 Key: SLING-2353
>                 URL: https://issues.apache.org/jira/browse/SLING-2353
>             Project: Sling
>          Issue Type: Bug
>          Components: Scripting
>    Affects Versions: Scripting JSP-Taglib 2.1.2
>            Reporter: Tobias Bocanegra
>            Assignee: Carsten Ziegeler
>            Priority: Minor
>             Fix For: Scripting JSP-Taglib 2.1.4
>
>
> If you add this sling:include to a JSP <sling:include resource="<%= null %>" 
> />
> then it will cause the page to keep including itself recursively making the
> server slow. there is a recursion limitation though to prevent endless loops.

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