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From "Bernhard Seebass (Resolved) (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (COLLECTIONS-392) AbstractHashedMap should not throw exception when initialized to zero size
Date Tue, 31 Jan 2012 08:38:10 GMT

     [ https://issues.apache.org/jira/browse/COLLECTIONS-392?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Bernhard Seebass resolved COLLECTIONS-392.
------------------------------------------

       Resolution: Duplicate
    Fix Version/s: 3.2.2

Yes, it definitely is a duplicate. Sorry and thank you. I hadn't found the original issue
as HashedMap was only mentioned in a comment.
                
> AbstractHashedMap should not throw exception when initialized to zero size
> --------------------------------------------------------------------------
>
>                 Key: COLLECTIONS-392
>                 URL: https://issues.apache.org/jira/browse/COLLECTIONS-392
>             Project: Commons Collections
>          Issue Type: Improvement
>          Components: Map
>            Reporter: Bernhard Seebass
>            Priority: Minor
>             Fix For: 3.2.2
>
>   Original Estimate: 0.25h
>  Remaining Estimate: 0.25h
>
> AbstractHashedMap(int initialCapacity, float loadFactor) throws IllegalArgumentException
when initialized to zero initialCapacity. Although this is the documented behaviour it is
quite unexpected as it differs from the java.util.HashMap implementation and provokes absurd
exceptions, e.g. in code like this:
> List results = criteria.list();
> Map resultMap = new HashedMap(results.size());
> It would be much safer to silently replace a zero initial capacity by initial capacity
1. Exactly this behaviour is already implemented in calculateNewCapacity(). Only the validation
and the javadoc would have to be adapted.

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