Re: [POOL] - Behavioral Change in GenericObjectPool.invalidateObject() Since 2.13.1 (POOL-424)

On Fri, Feb 20, 2026 at 3:47 AM ali takavci via dev
<[email protected]> wrote:
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> Hi Commons Pool team,
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> We are writing to flag a behavioral change in GenericObjectPool introduced in version 2.13.1 that is causing a regression in our library.
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> The change in question is:Ensure that invalidateObject replaces destroyed instance. JIRA: POOL-424 · apache/commons-pool@32fd701
> - ASF Jira
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> As part of this fix, invalidateObject() now internally calls addObject() to replace the destroyed instance. While we understand the intent, this introduces a breaking change for consumers whose object factories are not always capable of producing new pooled instances on demand — for example, factories that rely on external resources that may be temporarily unavailable.
> Previously, upgrading from 2.12.1 to 2.13.1 exposed this issue: in scenarios where the factory cannot provide a new instance, the addObject() call fails, causing invalidateObject() to throw an exception. This breaks our invalidation flow entirely.
> We are currently evaluating two workarounds — either catching and swallowing the exception from addObject(), or finding an alternative path to destroy the object without triggering pool replenishment. Neither approach is clean, and both carry trade-offs for our downstream users.
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> We would like to raise the question of whether it would be feasible to make the addObject() call within invalidateObject() optional — for instance, controlled by a configuration flag — so that pools backed by fallible factories are not adversely impacted.
> We are happy to contribute a patch or participate in the design discussion if that would be helpful.
>
> Thank you for your time and for maintaining this library.ali takavci

Hello Ali,

Thank you for your report.

POOL-424 was fixed in 2.13.0, not 2.13.1. Are you sure your issue
started with 2.13.1 and not 2.13.0?

I want to make sure we get the baseline right.

Thank you.
Gary

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> Ensure that invalidateObject replaces destroyed instance. JIRA: POOL-424...
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