[jira] [Commented] (POOL-264) NullPointerException in GKOP.borrowObject()

["Phil Steitz (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/POOL-264?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13976251#comment-13976251 ] 

Phil Steitz commented on POOL-264:
----------------------------------

Thank you for reporting this.  It would be great if you could provide a stack trace showing the NPE.

A workaround that you can try is to leave maxActive = -1 but set WHEN_EXHAUSTED_ACTION to WHEN_EXHAUSTED_BLOCK.  That may correct the sync and will achieve the same end result as negative maxActive means no limit to the number of available instances.

> NullPointerException in GKOP.borrowObject()
> -------------------------------------------
>
>                 Key: POOL-264
>                 URL: https://issues.apache.org/jira/browse/POOL-264
>             Project: Commons Pool
>          Issue Type: Bug
>    Affects Versions: 1.5.6
>            Reporter: Leonid Meyerguz
>
> While I cannot pin down a consistent repro, I occasionally observe a NullPointerException at org.apache.commons.pool.impl.GenericKeyedObjectPool.borrowObject(GenericKeyedObjectPool.java:1126)
> The pool is configured as follows:
> maxActive = -1
> maxIdle = 32
> maxTotal = 32
> whenExhaustedAction = WHEN_EXHAUSTED_GROW
> timeBetweenEvictionRunsMillis = 20000
> minEvictableIdleTimeMillis = 60000
> numTestsPerEvictionRun = -1
> The NullPointerException is thrown in the WHEN_EXHAUSTED_GROW branch of the code.  Specifically it appears that latch.getPool() returns null.
> Any suggestions for a work-around would be appreciated.



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