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From "Joerg Schaible (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MATH-505) TestUtils is thread-hostile
Date Tue, 01 Feb 2011 07:16:29 GMT

    [ https://issues.apache.org/jira/browse/MATH-505?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12989071#comment-12989071
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Joerg Schaible commented on MATH-505:
-------------------------------------

@Phil: Please also keep in mind that M3 supports now (currently optional) parallel execution
and it might be no longer a proper assumption that all tests are executed serially.

> TestUtils is thread-hostile
> ---------------------------
>
>                 Key: MATH-505
>                 URL: https://issues.apache.org/jira/browse/MATH-505
>             Project: Commons Math
>          Issue Type: Bug
>    Affects Versions: 1.2, 2.1
>            Reporter: Sebb
>
> TestUtils has several mutable static fields which are not synchronised, or volatile.
> If one of the fields is updated by thread A, there is no guarantee that thread B will
see the full update - it may see a partially updated object.
> Furthermore, at least some of the static fields reference a mutable object, which can
be changed whilst another thread is using it.
> As far as I can tell, this class must only ever be used by a single thread otherwise
the results will be unpredictable.

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