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https://issues.apache.org/jira/browse/COLLECTIONS-461?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13656536#comment-13656536
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Sebb commented on COLLECTIONS-461:
----------------------------------

bq.  Is the issue that TransformedMap is still named *Map?

No, the problem here is that the "real" Map classes are compromised because 
Put#put(K, V) returns Object rather than V.
The Put interface is not exactly the same as the "write" subset of 
java.util.Map.
                
> splitmap.TransformedMap is not really a Map
> -------------------------------------------
>
>                 Key: COLLECTIONS-461
>                 URL: https://issues.apache.org/jira/browse/COLLECTIONS-461
>             Project: Commons Collections
>          Issue Type: Bug
>            Reporter: Sebb
>             Fix For: 4.x
>
>
> splitmap.TransformedMap is part of the Get/Put hierarchy, but it does not 
> behave like a proper Java Map. 
> In particular, java.util.Map.put(K, V) returns V.
> However the collections Put interface returns Object.
> As far as I can tell, this was done in order to be able to include 
> TransformedMap in the hiearchy. But the side effect is to break the generics 
> for all the non-transformer maps in the hierarchy.
> Maybe there should be a separate PutTransformed interface which has the 
> appropriate generic types, i.e.
> public T put(K key, V value)

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