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From "Henri Yandell (JIRA)" <>
Subject [jira] Closed: (LANG-334) Enum is not thread-safe
Date Wed, 05 Sep 2007 10:14:32 GMT


Henri Yandell closed LANG-334.

    Resolution: Fixed

I've applied Jason's patch to enums.Enum and enum.Enum. Many thanks to both of you for working
on this issue.

> Enum is not thread-safe
> -----------------------
>                 Key: LANG-334
>                 URL:
>             Project: Commons Lang
>          Issue Type: Bug
>            Reporter: Michael Sclafani
>             Fix For: 2.4
>         Attachments: 334.patch,
> Enum uses no synchronization. Even if you assume that instances are only declared statically,
the cEnumClasses map is global and can be written to when a thread triggers static initialization
of B.class while some other thread is doing getEnumList(A.class). Unsynchronized access of
a map undergoing mutation is not thread-safe.
> This isn't theoretical. We're seeing ValuedEnum.getEnum(X.class, 0) return null after
returning the correct value over 100,000 times, and then return the correct value again on
the next invocation.

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