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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (POOL-359) NullPointerException closing multiple GenericObjectPools
Date Wed, 21 Nov 2018 06:06:00 GMT

    [ https://issues.apache.org/jira/browse/POOL-359?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16694283#comment-16694283
] 

ASF GitHub Bot commented on POOL-359:
-------------------------------------

Github user mswintermeyer commented on the issue:

    https://github.com/apache/commons-pool/pull/17
  
    Also, thank you for merging in the meantime, as well as for contributing your time to
maintain the project!


> NullPointerException closing multiple GenericObjectPools
> --------------------------------------------------------
>
>                 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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