[jira] Created: (COLLECTIONS-331) CollatingIterator NPE when Comparator is null

[Michael Krkoska (JIRA)]

CollatingIterator NPE when Comparator is null
---------------------------------------------

                 Key: COLLECTIONS-331
                 URL: https://issues.apache.org/jira/browse/COLLECTIONS-331
             Project: Commons Collections
          Issue Type: Bug
          Components: Iterator
    Affects Versions: 3.2
            Reporter: Michael Krkoska
            Priority: Minor


Run the attached Test against commons-collections-3.2.1. While the JavaDoc for 
CollatingIterator claims 

{...@param comp  the comparator to use to sort, or null to use natural sort 
order}}

the test fails, because the comparator is null.

Fixing this requires a change in 
{{org.apache.commons.collections.iterators.CollatingIterator.least()}}: 

{code}
if (comparator.compare(curObject,leastObject) < 0) { ...
{code}

could be replaced with

{code}
int c = 
comparator==null?((Comparable)curObject).compareTo(leastObject):comparator.compare(curObject,leastObject);
if (c < 0) { ...
{code}


The workaround is to provide a comparator, of course.

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