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Date: Fri, 16 Nov 2012 12:24:12 +0000 (UTC)
From: "Thomas Neidhart (JIRA)" <jira@apache.org>
To: issues@commons.apache.org
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Subject: [jira] [Commented] (MATH-899) A random crash of MersenneTwister
 random generator
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    [ https://issues.apache.org/jira/browse/MATH-899?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13498763#comment-13498763 ] 

Thomas Neidhart commented on MATH-899:
--------------------------------------

Indeed, I think it is a more general problem, as many of the RNGs are not thread-safe (if not all of them).
It would be nice to have annotations for thread-safe code, so a user would not have to dig into code to be sure.

For now we could also document in the class javadoc whether an implementation is thread-safe or not (like we did in commons-codec).
                
> A random crash of MersenneTwister random generator
> --------------------------------------------------
>
>                 Key: MATH-899
>                 URL: https://issues.apache.org/jira/browse/MATH-899
>             Project: Commons Math
>          Issue Type: Bug
>    Affects Versions: 3.0
>         Environment: Windows 7, JDK 1.7.05
>            Reporter: Alexander Nozik
>            Priority: Minor
>
> There is a very small probability that MersenneTwister generator gives a following error: 
> java.lang.ArrayIndexOutOfBoundsException: 624
> in MersenneTwister.java line 253
> The error is completely random and its probability is about 1e-8.
> UPD: The problem most probably arises only in multy-thread mode.

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