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https://issues.apache.org/jira/browse/PDFBOX-5127?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17300589#comment-17300589
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Tim Allison commented on PDFBOX-5127:
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My personal pref would be to generate SimpleDateFormat objects as needed. The
good news either way (maybe?) is that this is in an exception handling bit, and
I don't think I've seen it before so it should be pretty rare???
> 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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