[jira] [Commented] (COLLECTIONS-392) AbstractHashedMap should not throw exception when initialized to zero size

["Gary D. Gregory (Commented) (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/COLLECTIONS-392?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13196371#comment-13196371 ] 

Gary D. Gregory commented on COLLECTIONS-392:
---------------------------------------------

This looks like a duplicate of [COLLECTIONS-323]. If not, can you test a trunk build please for your specific test case? Better yet, can you provide a unit test patch to show the failure in trunk? Thank you.
                
> 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
>   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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