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https://issues.apache.org/jira/browse/LANG-588?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12830774#action_12830774
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Sebb commented on LANG-588:
---------------------------

The reason is visibility of the variable. 
There's no guarantee that a non-final variable set in one thread will be seen 
by other threads in the absence of some form of synch.

It's unlikely that the problem will occur, but it's possible, and will be 
extremely hard to track down if it does.

> Create a basic Pair<L, R> class
> -------------------------------
>
>                 Key: LANG-588
>                 URL: https://issues.apache.org/jira/browse/LANG-588
>             Project: Commons Lang
>          Issue Type: New Feature
>          Components: lang.*
>            Reporter: Matt Benson
>             Fix For: 3.0
>
>         Attachments: MatchedPair.java, MatchedPairTest.java, Pair.java, 
> PairTest.java
>
>
> [lang] is the perfect place to provide a basic typed Pair class.  I have 
> written such a class for my employer (who hasn't?) but can/will rewrite blind 
> to avoid IP issues.  I think it's also nice to go ahead and extend this to 
> MatchedPair<T> extends Pair<T, T> as well.

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