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https://issues.apache.org/jira/browse/COLLECTIONS-504?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Peter Cooper Jr. closed COLLECTIONS-504.
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Resolution: Invalid
> CompositeMap should support compositing of maps of derived types
> ----------------------------------------------------------------
>
> Key: COLLECTIONS-504
> URL: https://issues.apache.org/jira/browse/COLLECTIONS-504
> Project: Commons Collections
> Issue Type: Bug
> Components: Map
> Affects Versions: 4.0
> Reporter: Peter Cooper Jr.
> Priority: Minor
>
> I'm attempting to composite two maps, one of which is a {{Map<String,
> String>}} and the other of which is a {{Map<String, Object>}}. I would have
> expected that I could composite them into a {{CompositeMap<String, Object>}},
> but the constructors of CompositeMap expect all of the maps being composited
> to have exactly the same type arguments.
> That is, I think the constructors should take arguments of {{Map<? extends K,
> ? extends V>}} instead of what they currently have of {{Map<K, V>}}, much
> like most collection methods, since there shouldn't be a problem accepting
> type arguments that are subtypes of the composite map types.
> Thanks!
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