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https://issues.apache.org/jira/browse/SLING-10371?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17342869#comment-17342869
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Joerg Hoh commented on SLING-10371:
-----------------------------------

Fixed with https://github.com/apache/sling-org-apache-sling-api/pull/30, also 
added a testcase to illustrate the behavior. 

> SlingAdaptable: ConcurrentModificationException on nested adaptTo() calls
> -------------------------------------------------------------------------
>
>                 Key: SLING-10371
>                 URL: https://issues.apache.org/jira/browse/SLING-10371
>             Project: Sling
>          Issue Type: Task
>          Components: API
>    Affects Versions: API 2.23.4
>            Reporter: Joerg Hoh
>            Priority: Major
>
> I introduced a regression with SLING-10327, that nested adaptTo() calls on 
> the same adaptable throw a ConcurrentModificationException.
> {noformat}
> java.util.ConcurrentModificationException
>       at java.base/java.util.HashMap.computeIfAbsent(HashMap.java:1134)
>       at 
> org.apache.sling.api.adapter.SlingAdaptable.adaptTo(SlingAdaptable.java:104)
>       at 
> org.apache.sling.resourceresolver.impl.ResourceResolverImpl.adaptTo(ResourceResolverImpl.java:636)
> {noformat}
> Reverting 
> https://github.com/apache/sling-org-apache-sling-api/commit/eeb8f84f92a2f1bbfad236ba9dca9c15c2e837f3
>  



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