[jira] Updated: (LANG-494) CharSet sub-classes cannot be made thread-safe

["Niall Pemberton (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LANG-494?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Niall Pemberton updated LANG-494:
---------------------------------

    Fix Version/s:     (was: 3.0)
                   2.5

> 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
>          Components: lang.*
>            Reporter: Sebb
>             Fix For: 2.5
>
>
> 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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