commons-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Maks (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (COLLECTIONS-377) CollatingIterator throws NullPointerException when constructor is given null (or no) Comparator
Date Thu, 20 Oct 2011 12:01:17 GMT

    [ https://issues.apache.org/jira/browse/COLLECTIONS-377?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13131537#comment-13131537
] 

Maks commented on COLLECTIONS-377:
----------------------------------

I fixed. 
                
> CollatingIterator throws NullPointerException when constructor is given null (or no)
Comparator
> -----------------------------------------------------------------------------------------------
>
>                 Key: COLLECTIONS-377
>                 URL: https://issues.apache.org/jira/browse/COLLECTIONS-377
>             Project: Commons Collections
>          Issue Type: Bug
>          Components: Iterator
>    Affects Versions: 3.2
>         Environment: Java 1.6.0_26
>            Reporter: Ryan Hochstetler
>            Priority: Minor
>
> CollatingIterator's javadoc (http://commons.apache.org/collections/api-release/index.html)
states that natural sort ordering will be used when null is passed as the Comparator argument
to any of the constructors accepting one (and for the nullary constructor).  The following
stack is thrown from the subsequent unit test.  The implementation of least() does not appear
to account for the natural sort order case.
> java.lang.NullPointerException
> 	at org.apache.commons.collections.iterators.CollatingIterator.least(CollatingIterator.java:334)
> 	at org.apache.commons.collections.iterators.CollatingIterator.next(CollatingIterator.java:230)
> 	at mil.af.statistics.jutl.collection.MutableDataSeriesTest...
>     @SuppressWarnings("unchecked")
>     @Test
>     public void testCollatingIteratorNaturalOrdering() throws Exception
>     {
>         Integer[] expected =
>         { Integer.valueOf(1), Integer.valueOf(2), Integer.valueOf(3), Integer.valueOf(4),
Integer.valueOf(5),
>             Integer.valueOf(6) };
>         List<Integer> evens = Arrays.asList(new Integer[]
>         { Integer.valueOf(2), Integer.valueOf(4), Integer.valueOf(6) });
>         List<Integer> odds = Arrays.asList(new Integer[]
>         { Integer.valueOf(1), Integer.valueOf(3), Integer.valueOf(5) });
>         Iterator<Integer> collatingIter = new CollatingIterator(null, evens.iterator(),
odds.iterator());
>         for (Integer expectedInt : expected)
>         {
>             assertTrue(collatingIter.hasNext());
>             assertEquals(expectedInt, collatingIter.next());
>         }
>     }
> Workaround: provide a Comparator that implements the natural ordering contract.

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira

        

Mime
View raw message