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From "Gary D. Gregory (Commented) (JIRA)" <>
Subject [jira] [Commented] (COLLECTIONS-392) AbstractHashedMap should not throw exception when initialized to zero size
Date Mon, 30 Jan 2012 19:53:10 GMT


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:
>             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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