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https://issues.apache.org/jira/browse/COLLECTIONS-514?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Thomas Neidhart closed COLLECTIONS-514.
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> NullPointerException in MapBackedSet.mapBackedSet
> -------------------------------------------------
>
> Key: COLLECTIONS-514
> URL: https://issues.apache.org/jira/browse/COLLECTIONS-514
> Project: Commons Collections
> Issue Type: Bug
> Components: Bag, Collection, Set
> Affects Versions: 4.0
> Environment: MacOS 10.9, Java 6
> Reporter: Cyrille Artho
> Attachments: Report2.java
>
>
> It seems that addAll has issues with adding a set that is backed by a
> singleton map with entry null -> null. However, the javadoc of the involved
> classes does not state that null entries are disallowed.
> Either the code should allow adding a null entry to a bag, or the
> documentation should state that null entries are not allowed.
> See the attached unit test in JUnit format to reproduce the problem.
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