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https://issues.apache.org/jira/browse/PDFBOX-5127?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17300748#comment-17300748
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Tilman Hausherr commented on PDFBOX-5127:
-----------------------------------------
[~tallison] you're right, I realize the multithreading is because these files
both have date formats that are not supported. That's the reason it hasn't hit
any users in the wild.
> Multithreading issue in JempBox's DateConverter
> -----------------------------------------------
>
> Key: PDFBOX-5127
> URL: https://issues.apache.org/jira/browse/PDFBOX-5127
> Project: PDFBox
> Issue Type: Bug
> Reporter: Tim Allison
> Priority: Major
>
> [~tilman] recently found an exception thrown from here
> ([https://github.com/apache/pdfbox/blob/1.8/jempbox/src/main/java/org/apache/jempbox/impl/DateConverter.java#L186)]
> in one run of tika-eval but not in another.
>
> This is a multithreading issue caused by
> [https://github.com/apache/pdfbox/blob/1.8/jempbox/src/main/java/org/apache/jempbox/impl/DateConverter.java#L43]
> SimpleDateFormat is not threadsafe. I'm surprised we haven't seen this
> earlier, but so it goes.
>
> Many, many thanks to Tilman for finding this!
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