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From Mark Thomas <>
Subject Re: [pool] getNumActive returning -1
Date Wed, 08 Jun 2011 13:31:13 GMT
On 06/06/2011 08:34, Phil Steitz wrote:
> On 6/5/11 7:32 PM, Phil Steitz wrote:
>> The AbandonedObjectPool test case that I just commented out in
>> [dbcp] trunk is failing because GOP getNumActive returns -1.  My
>> first thought was that this is a timing issue due to lack of
>> synchronization in invalidate and general non-protection of
>> _allObjects and _idleObjects; but I can't demonstrate this.  Looking
>> into it now...
> I found the problem. The test object class was not threadsafe,
> resulting in multiple equal instances generated by the factory. 
> This results in returnObject replacing rather than duplicating
> instances in _allObjects, which causes _allObjects to have fewer
> instances than _idleObjects.  We need to think about this setup a
> little, as it will break if equal instances are ever generated by
> object factories and in circulation at the same time.  I think it is
> a reasonable expectation that distinct instances generated by object
> factories must not be equal; but this is a new requirement and it
> needs to be documented and we might want to consider a guard for it.

Good catch. I'm not sure I would have found that anywhere near that quickly.

I'll look into putting a guard into pool for this.


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