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https://issues.apache.org/jira/browse/SLING-12253?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17818747#comment-17818747
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Carsten Ziegeler commented on SLING-12253:
------------------------------------------
It seems AbstractResourceCollector#getChildrenList is modifying the list
*after* it got put into the cache which then allows another thread to pick up
the cached result before the list is completely assembled.
A workaround is to disable caching.
> ConcurrentModificationException in AbstractResourceCollector
> ------------------------------------------------------------
>
> Key: SLING-12253
> URL: https://issues.apache.org/jira/browse/SLING-12253
> Project: Sling
> Issue Type: Task
> Affects Versions: Servlets Resolver 2.9.14, Servlets Resolver 2.10.0,
> Servlets Resolver 2.11.0
> Reporter: Joerg Hoh
> Priority: Major
>
> {noformat}
> [[::1] [1705550745690] GET /content/foobar.html HTTP/1.1]
> org.apache.sling.engine.impl.SlingRequestProcessorImpl service: Uncaught
> Throwable
> java.util.ConcurrentModificationException: null
> at
> java.base/java.util.ArrayList$Itr.checkForComodification(ArrayList.java:1043)
> at java.base/java.util.ArrayList$Itr.next(ArrayList.java:997)
> at
> org.apache.sling.servlets.resolver.internal.helper.ResourceCollector.getWeightedResources(ResourceCollector.java:232)
> [org.apache.sling.servlets.resolver:2.9.14]
> at
> org.apache.sling.servlets.resolver.internal.helper.AbstractResourceCollector.lambda$getServlets$1(AbstractResourceCollector.java:117)
> [org.apache.sling.servlets.resolver:2.9.14]
> at java.base/java.util.ArrayList.forEach(ArrayList.java:1541)
> at
> org.apache.sling.servlets.resolver.internal.helper.AbstractResourceCollector.getServlets(AbstractResourceCollector.java:117)
> [org.apache.sling.servlets.resolver:2.9.14]
> at
> org.apache.sling.servlets.resolver.internal.SlingServletResolver.getServletInternal(SlingServletResolver.java:528)
> [org.apache.sling.servlets.resolver:2.9.14]
> at
> org.apache.sling.servlets.resolver.internal.SlingServletResolver.resolveServletInternal(SlingServletResolver.java:489)
> [org.apache.sling.servlets.resolver:2.9.14]
> ...
> {noformat}
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