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https://issues.apache.org/jira/browse/PDFBOX-4181?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16424444#comment-16424444
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Tilman Hausherr edited comment on PDFBOX-4181 at 4/3/18 7:01 PM:
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I reverted the change because of an NPE that occurs with the attached file. I
suspect that doesn't allow null values.
https://stackoverflow.com/questions/698638/why-does-concurrenthashmap-prevent-null-keys-and-values
was (Author: tilman):
I reverted the change because of an NPE that occurs with the attached file.
> GlyphList.toUnicode not secured for concurrent access
> -----------------------------------------------------
>
> Key: PDFBOX-4181
> URL: https://issues.apache.org/jira/browse/PDFBOX-4181
> Project: PDFBox
> Issue Type: Bug
> Affects Versions: 2.0.9
> Reporter: Tilman Hausherr
> Assignee: Tilman Hausherr
> Priority: Major
> Fix For: 2.0.10, 3.0.0 PDFBox
>
> Attachments: bug_example.pdf
>
>
> See attached SO issue... {{uniNameToUnicodeCache}} can be written to by
> several threads at the same time.
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