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https://issues.apache.org/jira/browse/LUCENE-4595?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13525884#comment-13525884
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Robert Muir commented on LUCENE-4595:
-------------------------------------

This failed in my jenkins too.

I can recreate it by running the test many times (adding -Dtests.dups=1000 or 
some large number to the end of the seed).

For example:
{noformat}
ant test  -Dtestcase=EnwikiContentSourceTest -Dtests.method=testForever 
-Dtests.seed=D4FC46984E855EE -Dtests.slow=true -Dtests.locale=es_NI 
-Dtests.timezone=America/Montevideo -Dtests.file.encoding=UTF-8 
-Dtests.dups=1000
{noformat}
                
> EnwikiContentSource thread safety problem (NPE) in 'forever' mode
> -----------------------------------------------------------------
>
>                 Key: LUCENE-4595
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4595
>             Project: Lucene - Core
>          Issue Type: Bug
>          Components: modules/benchmark
>            Reporter: Doron Cohen
>            Assignee: Doron Cohen
>            Priority: Minor
>         Attachments: LUCENE-4595.patch
>
>
> If close() is invoked around when an additional input stream reader is 
> recreated for the 'forever' behavior, an uncaught NPE might occur.
> This bug was probably always there, just exposed now with the 
> EnwikioContentSourceTest added in LUCENE-4588.

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