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https://issues.apache.org/jira/browse/HTTPCLIENT-2391?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18020650#comment-18020650
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ASF subversion and git services commented on HTTPCLIENT-2391:
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Commit 694394ca8f5bb05eb36f9ec70ab8101a3859ed49 in httpcomponents-client's
branch refs/heads/5.5.x from Oleg Kalnichevski
[ https://gitbox.apache.org/repos/asf?p=httpcomponents-client.git;h=694394ca8 ]
HTTPCLIENT-2391: improved GRACEGUL shutdown of ExecutorService used internally
by async clients
> Bug in closing AbstractHttpAsyncClientBase causing long-lived classloaders
> --------------------------------------------------------------------------
>
> Key: HTTPCLIENT-2391
> URL: https://issues.apache.org/jira/browse/HTTPCLIENT-2391
> Project: HttpComponents HttpClient
> Issue Type: Bug
> Components: HttpClient (async)
> Affects Versions: 5.5
> Reporter: Pavel Kostelnik
> Priority: Minor
> Fix For: 5.5.1, 5.6-alpha1
>
> Attachments: bugClient.png
>
> Time Spent: 40m
> Remaining Estimate: 0h
>
> We have identified a bug in the closing mechanism of the executor service for
> {{{}AbstractHttpAsyncClientBase{}}}. The executor service is created as a
> single-thread executor, specifically an
> {{{}AutoShutdownDelegatedExecutorService{}}}. This class creates a phantom
> reference that is cleanable to the executor service it delegates to.
> h4. *Issue Details:*
> * The {{AutoShutdownDelegatedExecutorService}} correctly calls the
> {{shutdownNow()}} method on the underlying executor service.
> * However, the phantom reference is never dereferenced and remains held
> internally.
> * When used with dynamic class loading, this results in a classloader hook
> that remains active, leading to long-lived classloaders that block non-heap
> memory.
> h4. *Proposed Solution:*
> *Call shutdown() after shutdownNow() -* Implement logic to ensure that the
> phantom reference is properly dereferenced
> h4. *Benefits:*
> * Fixing this bug will prevent classloader hooks from hanging and ensure
> that non-heap memory is not blocked by long-lived classloaders.
> Implementing this change will significantly enhance the resource management
> and reliability of the executor service in our application.
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