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https://issues.apache.org/jira/browse/LANG-494?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12741723#action_12741723
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Henri Yandell commented on LANG-494:
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So, do we wrap it in a synchronized call?
> CharSet sub-classes cannot be made thread-safe
> ----------------------------------------------
>
> Key: LANG-494
> URL: https://issues.apache.org/jira/browse/LANG-494
> Project: Commons Lang
> Issue Type: Bug
> Reporter: Sebb
> Fix For: 3.0
>
>
> AFAICT, CharSet sub-classes cannot be made thread-safe.
> This is because the HashMap and HashSet collections are not thread-safe.
> If a sub-class updates COMMON, there is no guarantee that getInstance() will
> see the update.
> In the case of the instance variable "set", the sub-class could override all
> the read/write methods to provide thread-safety.
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