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https://issues.apache.org/jira/browse/COLLECTIONS-710?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gary Gregory resolved COLLECTIONS-710.
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Resolution: Fixed
Fix Version/s: 4.3.1
[~sychelsea],
Thank you for your report.
Fixes are in git master. Please verify and close. If there are still problems,
please provide a PR on GitHub.
Gary
> NullPointerExceptions in CompositeCollection, CompositeSet, and CompositeMap
> ----------------------------------------------------------------------------
>
> Key: COLLECTIONS-710
> URL: https://issues.apache.org/jira/browse/COLLECTIONS-710
> Project: Commons Collections
> Issue Type: Bug
> Components: Collection, Map, Set
> Affects Versions: 4.2
> Environment: Windows 10
> Eclipse IDE for Java Developers Version: 2018-09 (4.9.0)
> Reporter: Yu Shi
> Priority: Major
> Labels: nullpointerexception
> Fix For: 4.3.1
>
> Original Estimate: 1h
> Remaining Estimate: 1h
>
> If we first add a null element into CompositeCollection by
> CompositeCollection.addComposited(nullElement), projects will crash and throw
> java.lang.NullPointerException when we call CompositeCollection.size().
> For example, we have following code:
> ArrayList<String> nullList = null;
> CompositeCollection<String> cc = new CompositeCollection<String>(list);
> cc.addComposited(nullList);
> System.out.println(cc.size());
>
> We will get:
> {{Exception in thread "main" java.lang.NullPointerException}}
> at
> org.apache.commons.collections4.collection.CompositeCollection.size(CompositeCollection.java:103)
>
> Because in CompositeCollection.size(), it iterate all items in the
> Collection, call item.size() and sum up their size. If the item point to
> null, the program will crash.
>
> This bug also exists in other methods of CompositeCollection. Moreover,
> CompositeSet and CompositeMap have the same bug.
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