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From "Radoslav Paskalev (JIRA)" <>
Subject [jira] [Created] (COLLECTIONS-519) private constructors in utility classes break existing code
Date Tue, 22 Apr 2014 10:06:15 GMT
Radoslav Paskalev created COLLECTIONS-519:

             Summary: private constructors in utility classes break existing code
                 Key: COLLECTIONS-519
             Project: Commons Collections
          Issue Type: Bug
    Affects Versions: 4.x
            Reporter: Radoslav Paskalev


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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