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https://issues.apache.org/jira/browse/PDFBOX-6085?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18032331#comment-18032331
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Tilman Hausherr commented on PDFBOX-6085:
-----------------------------------------
[~cdokolas] please run your application with a snapshot build and check that it
works:
https://repository.apache.org/content/groups/snapshots/org/apache/pdfbox/fontbox/3.0.7-SNAPSHOT/
Btw while testing I noticed that it makes a difference what version of the font
is used, it doesn't occur with the current version, maybe because the glyph
order is different. (the zero length glyph has GID 132 in the old version, GID
761 in the new one)
> TTFSubsetter.buildGlyfTable() modifies glyphIds while iterating over its
> entries possibly causing ConcurrentModificationException to be thrown
> ----------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: PDFBOX-6085
> URL: https://issues.apache.org/jira/browse/PDFBOX-6085
> Project: PDFBox
> Issue Type: Bug
> Affects Versions: 2.0.35, 3.0.6 PDFBox
> Reporter: Constantine Dokolas
> Assignee: Tilman Hausherr
> Priority: Major
> Fix For: 2.0.36, 3.0.7 PDFBox, 4.0.0
>
> Attachments: PDFBOX-6085-demo.pdf
>
>
> Modifying a {{TreeSet}} while iterating over its members is prohibited as it
> may throw a {{ConcurrentModificationException}} if the set is actually
> modified.
> This can be observed during subsetting some fonts, e.g. Devanagari
> (NotoSansDevanagari).
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