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https://issues.apache.org/jira/browse/LANG-833?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13464850#comment-13464850
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Sebb commented on LANG-833:
---------------------------

Actually, one cannot use AbstractStringBuilder as that is not visible.

The problem is twofold:
- there's no suitable common interface or class for StringBuilder and 
StringBuffer
- changing to use StringBuilder would break compatibility, and might cause some 
applications that rely on the sync. to fail

I don't see how it's possible to use StringBuilder without either:
- breaking compatibility and some apps, OR
- duplicating the API
                
> ToStringBuilder should use StringBuilder
> ----------------------------------------
>
>                 Key: LANG-833
>                 URL: https://issues.apache.org/jira/browse/LANG-833
>             Project: Commons Lang
>          Issue Type: Bug
>          Components: lang.*
>    Affects Versions: 3.1
>            Reporter: Shevek
>
> Rewriting as lang3 but still using StringBuffer (synchronized) looks like a 
> missed opportunity. Please use StringBuilder.
> Suggest audit for uses of StringBuffer in lang3 overall. No cause for it.

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