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https://issues.apache.org/jira/browse/PDFBOX-5127?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17300722#comment-17300722
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Tilman Hausherr commented on PDFBOX-5127:
-----------------------------------------

I added a minimal test because when I replaced POTENTIAL_FORMATS with an empty 
array the build passed without a single failure.

> 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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