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From "Phil Steitz (JIRA)" <>
Subject [jira] Updated: (POOL-29) [pool]NumActive goes to negative when the pool can't create more objects
Date Sat, 31 May 2008 20:25:45 GMT


Phil Steitz updated POOL-29:

    Fix Version/s:     (was: 1.3)

> [pool]NumActive goes to negative when the pool can't create more objects
> ------------------------------------------------------------------------
>                 Key: POOL-29
>                 URL:
>             Project: Commons Pool
>          Issue Type: Bug
>    Affects Versions: 1.2
>         Environment: Operating System: All
> Platform: All
>            Reporter: Daniel C. Amadei
>             Fix For: 1.5
> Under heavy usage on multithreaded environment, the pool start to show 
> NumActive property as negative value.
> We've implemented a pool of sockets and if there is a problem creating new 
> sockets after some time of successful operation, the pool starts trying to 
> create new sockets but while trying to create them, it goes removing invalid 
> instances from the pool and after the evictor runs, it starts to invalidate the 
> objects, making the numActive property stay negative.
> I changed the class GenericObjectPoolImpl to check if _numActive property is 
> bigger than Zero, before decrementing it and I'd like to know if this is ok so 
> I can submit a patch. From my tests, it's working fine after checking if 
> numActive is > than zero before executing numActive--.
> Daniel

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