Github user mswintermeyer commented on the issue:
https://github.com/apache/commons-pool/pull/17
If `cancel` should not be called more than once, then I believe that would
require a greater re-architecture. `GenericObjectPool`'s would need to keep
track of whether another object pool called `cancel`: to rely on something
other than non-static state (`closed` variable on `BaseGenericObjectPool`) to
call a static method. To me, it seems cleanest for static methods to be
designed defensively. So I'm not aware of a reason to not allow this, but I
acknowledge I'm new to the codebase.
Side note that the risk of an NPE in `cancel` seems somewhat new. [This
commit](https://github.com/apache/commons-pool/commit/867614829ba6b041ca6becbad0f43cb180003404#diff-38e254894b87bdf9a1758778c7ffd50fL96)
refactored `EvictionTimer` to depend on the executor's queue rather than an
integer `usageCount`.
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