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From "Gary Gregory (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (COLLECTIONS-661) Intermittent test failures in Windows for HashSetValuedHashMap
Date Tue, 03 Oct 2017 18:38:01 GMT

    [ https://issues.apache.org/jira/browse/COLLECTIONS-661?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16190118#comment-16190118
] 

Gary Gregory commented on COLLECTIONS-661:
------------------------------------------

Could this be related to this note in {{Object.hashCode(Object)}}:
{code:java}
     * <li>It is <em>not</em> required that if two objects are unequal
     *     according to the {@link java.lang.Object#equals(java.lang.Object)}
     *     method, then calling the {@code hashCode} method on each of the
     *     two objects must produce distinct integer results.  However, the
     *     programmer should be aware that producing distinct integer results
     *     for unequal objects may improve the performance of hash tables.
{code}


> Intermittent test failures in Windows for HashSetValuedHashMap
> --------------------------------------------------------------
>
>                 Key: COLLECTIONS-661
>                 URL: https://issues.apache.org/jira/browse/COLLECTIONS-661
>             Project: Commons Collections
>          Issue Type: Bug
>          Components: Map
>    Affects Versions: 4.1
>            Reporter: Bruno P. Kinoshita
>            Assignee: Bruno P. Kinoshita
>             Fix For: 4.2
>
>
> The collection HashSetValuedHashMap was added in 4.1. On Windows, test failures are not
so common on JVM 8. But on Linux they are harder to happen (but still do [1], [2]).
> When using Windows and JVM 8, running tests on Eclipse, or Maven fail. But debugging
on Windows with Eclipse sometimes work. Indicating it may be due to a concurrency issue, where
debugging adds some extra time hiding the real issue.
> I have a few ideas of where/why it could be happening, but am without a Windows box for
a few days as I'm travelling. I'm reading the codebase in the meantime, but if anybody feels
like working on it, feel free to chime in and suggest a fix/patch.
> [1] https://travis-ci.org/apache/commons-collections/jobs/282169803
> [2] http://markmail.org/thread/exwm7ggjtxzbtlkd



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