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From "M Kim (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (COLLECTIONS-554) NullPointerException in CollectionUtils.partition
Date Tue, 17 Feb 2015 14:42:11 GMT

    [ https://issues.apache.org/jira/browse/COLLECTIONS-554?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14324251#comment-14324251
] 

M Kim commented on COLLECTIONS-554:
-----------------------------------

Yes, when I call 
CollectionUtils.<java.util.Collection>partition((java.lang.Iterable)input, predicates);
without a factory argument,
I get a ClassCastException: org.apache.commons.collections4.multimap.MultiValuedHashMap cannot
be cast to java.util.Collection with the same arguments.


> NullPointerException in CollectionUtils.partition
> -------------------------------------------------
>
>                 Key: COLLECTIONS-554
>                 URL: https://issues.apache.org/jira/browse/COLLECTIONS-554
>             Project: Commons Collections
>          Issue Type: Bug
>          Components: Collection
>    Affects Versions: 4.1
>            Reporter: M Kim
>            Priority: Minor
>
> NullPointerException (NPE) is not suitably handled in CollectionUtils.partition. With
a nullFactory, partitions.get(numberOfPredicates) can be null at line partitions.get(numberOfPredicates).add(element);.
> Stack trace:
> {code}
> test(Test)java.lang.NullPointerException
>         at org.apache.commons.collections4.CollectionUtils.partition(CollectionUtils.java:1187)
>         at Test.test(Test.java:18)
> {code}
> Test case:
> {code}
> public void test() {
>   Collection input = CollectionUtils.permutations((java.util.Collection)new CircularFifoQueue(10));
>   Factory factory = FactoryUtils.nullFactory();
>   NullIsFalsePredicate p = new NullIsFalsePredicate(NullPredicate.nullPredicate());
>   Predicate[] predicates = p.getPredicates();
>   CollectionUtils.<java.lang.Object,java.util.Collection>partition((java.lang.Iterable)input,
factory, predicates);
> }
> {code}



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