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From "Henri Yandell (JIRA)" <>
Subject [jira] Commented: (LANG-367) FastDateFormat thread safety
Date Sat, 03 Nov 2007 21:30:50 GMT


Henri Yandell commented on LANG-367:

The format methods don't hit SimpleDateFormat though - they're the ones getting replaced.

> FastDateFormat thread safety
> ----------------------------
>                 Key: LANG-367
>                 URL:
>             Project: Commons Lang
>          Issue Type: Bug
>            Reporter: Sebb
>             Fix For: 2.4
>         Attachments: FastDateFormat.patch
> FastDateFormat has several static HashMaps. These are currently not final, so there is
no guarantee that they will be visible to all threads.
> Patch to follow.
> Also, as far as I can make out, the class shares SimpleDateFormat instances between threads.
> It does not document why this is OK.
> I'm guessing that it assumes that instances of the SimpleDateFormat class are thread-safe
provided that they have the same attributes, but this is not documented. If this is the case,
it's not clear that it is a valid assumption.

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