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