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From "Mark Thomas (JIRA)" <>
Subject [jira] [Resolved] (POOL-220) PoolableObject#compareTo() is not guaranteed consistent with equals
Date Sat, 05 May 2012 20:57:48 GMT


Mark Thomas resolved POOL-220.

    Resolution: Fixed

I went for the option of clarifying in the Javadoc that the natural ordering was inconsistent
with equals(). Just relying on lastReturnTime and identityHashCode for equals() may have caused
bugs elsewhere in the code base - the behaviour would certainly be unexpected.
> PoolableObject#compareTo() is not guaranteed consistent with equals
> -------------------------------------------------------------------
>                 Key: POOL-220
>                 URL:
>             Project: Commons Pool
>          Issue Type: Bug
>            Reporter: Sebb
> PooledObject#compareTo only returns 0 if the getLastRuntime values are equal AND the
identityHashCodes are equal.
> This will work OK for the identity comparison, but is not guaranteed to work in all other
> It's possible for two distinct objects to have the same identityHashCode. 
> If such objects happen to have the same lastRuntime, then compareTo will return 0, but
equals (which defaults to Object#equals) will return false.
> It's not very likely, but it is possible.
> A simple fix would be to define equals() to return true only in the case that the lastRuntime
values and identityHashCodes are equal.
> Also, the Javadoc for the compareTo method ought to make clear what the ordering is intended
to achieve.

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