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https://issues.apache.org/jira/browse/POOL-359?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16691255#comment-16691255
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ASF GitHub Bot commented on POOL-359:
-------------------------------------
Github user grimreaper commented on the issue:
https://github.com/apache/commons-pool/pull/17
Works for me. Blocked on INFRA-17267
travis fails for unrelated reasons, but tests pass locally:
```
[INFO]
------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO]
------------------------------------------------------------------------
[INFO] Total time: 05:45 min
[INFO] Finished at: 2018-11-18T20:54:44-08:00
[INFO]
------------------------------------------------------------------------
```
> NullPointerException closing multiple GenericObjectPool's
> ---------------------------------------------------------
>
> Key: POOL-359
> URL: https://issues.apache.org/jira/browse/POOL-359
> Project: Commons Pool
> Issue Type: Bug
> Affects Versions: 2.6.0
> Reporter: Michael Wintermeyer
> Priority: Major
>
> {code:java}
> java.lang.NullPointerException
> at org.apache.commons.pool2.impl.EvictionTimer.cancel(EvictionTimer.java:97)
> at
> org.apache.commons.pool2.impl.BaseGenericObjectPool.startEvictor(BaseGenericObjectPool.java:753)
> at
> org.apache.commons.pool2.impl.GenericObjectPool.close(GenericObjectPool.java:694)
> {code}
> Possible when multiple pools in the same process each call #close.
> GenericObjectPool#close checks #isClosed before proceeding, but that call
> checks a non-static instance variable. It calls into EvictionTimer#cancel
> which sets the _static_ variable EvictionCache.executor to null.
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