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https://issues.apache.org/jira/browse/SLING-5068?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14933414#comment-14933414
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Carsten Ziegeler commented on SLING-5068:
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Ah, right - I start to remember this stuff :)
The problem is that this resource - while using a thread local - is not using
the same thread local as SlingServletResolver, therefore as soon as another
thread is using this resource, the thread local will return null and it
switches to the shared resource resolver
> perThreadScriptResolver is shared between multiple Threads causing ISE in
> ResourceResolverImpl
> ----------------------------------------------------------------------------------------------
>
> Key: SLING-5068
> URL: https://issues.apache.org/jira/browse/SLING-5068
> Project: Sling
> Issue Type: Bug
> Components: Servlets
> Affects Versions: Servlets Resolver 2.3.6
> Environment: We facing the following issue with AEM 6.1 build on top
> of Servlet Resolver 2.3.6.
> Reporter: Dirk Rudolph
> Priority: Critical
> Attachments: error-stacktrace.txt, opened-and-closed-trace.txt
>
>
> We are building a single page application that loads small markup pieces in
> several subsequent requests. For each request the same rendering applies and
> so the same script is used.
> When cleaning the ServletResolvers internal cache we get a lot of ISE
> ("Resource resolver is already closed") which seems to be because the
> ResourceResolver is used in multiple Threads.
> The problem seems to be that the first request creates an entry in the
> servlet resolvers cache with a servlet that sets the perThreadScriptResolver
> of this request/thread to the context. This entry is reused in another
> thread. When now the first one finishes the processing the
> perThreadScriptResolver gets closed in the onEvent method of ServletResolver
> but is still used in the ScriptContext of another Thread.
> See the attached Exceptions we got by adding some trace logging to the
> ResourceResolverImpl (1.2.4). It proves that it is the
> perThreadScriptResolver and not the shared one that causes the problem.
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