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From "Sebb (JIRA)" <j...@apache.org>
Subject [jira] Updated: (MATH-505) TestUtils is thread-hostile
Date Tue, 01 Feb 2011 18:48:28 GMT

     [ https://issues.apache.org/jira/browse/MATH-505?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sebb updated MATH-505:
----------------------

    Affects Version/s:     (was: 1.2)
                       3.0

> TestUtils is thread-hostile
> ---------------------------
>
>                 Key: MATH-505
>                 URL: https://issues.apache.org/jira/browse/MATH-505
>             Project: Commons Math
>          Issue Type: Bug
>    Affects Versions: 2.1, 3.0
>            Reporter: Sebb
>            Assignee: 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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