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https://issues.apache.org/jira/browse/COLLECTIONS-519?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Thomas Neidhart resolved COLLECTIONS-519.
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Resolution: Fixed
Fix Version/s: 4.1
In r1591602, I have changed all constructors of *Utils classes from private to
protected to allow sub-classing.
Commons is a community project, thus we need feedback from our users to further
improve the components.
Thanks for the use-cases that you presented here, probably not something that
lots of people do, but certainly valid and useful.
> private constructors in utility classes break existing code
> -----------------------------------------------------------
>
> Key: COLLECTIONS-519
> URL: https://issues.apache.org/jira/browse/COLLECTIONS-519
> Project: Commons Collections
> Issue Type: Bug
> Affects Versions: 4.x
> Reporter: Radoslav Paskalev
> Fix For: 4.1
>
>
> Hello,
> In collections version 4.x all utility classes (example ListUtils, MapUtils,
> PredicateUtils....) have private constructors. I consider this to be a
> serious bug, as it breaks any possibility the classes to be extended by the
> users. The javadoc says that constructors are private in order to prevent
> class instantiation but this object instantiation is not really problem and i
> think it is more important to allow classes to be extended. The possibility
> to extend utility classes was one of the major selling points of commons.lang
> and commons.collections projects. In the latest commons.lang project the
> utility classes still have public constructors.
> Best Regards
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