Pavel Kostelnik created HTTPCLIENT-2391:
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Summary: 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, 5.6-alpha1
Reporter: Pavel Kostelnik
Attachments: bugClient.png
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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