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https://issues.apache.org/jira/browse/PDFBOX-6085?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18031504#comment-18031504
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Tilman Hausherr edited comment on PDFBOX-6085 at 10/21/25 8:00 PM:
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Could you create a minimal example, i.e. with specific characters that trigger
the problem with that font? I agree with you but I'm surprised that this hasn't
occurred before, this code has been there since its contribution in 2012. I
looked at the test coverage and the problematic {{glyphIds.add()}} is used.
What jdk are you using?
I can't comment on your question at this time, I would have to understand the
code first.
was (Author: tilman):
Could you create a minimal example, i.e. with specific characters that trigger
the problem with that font? I agree with you but I'm surprised that this hasn't
occurred before, this code has been there since its contribution in 2012. I
looked at the test coverage and the problematic {{glyphIds.add()}} is used.
I can't comment on your question at this time, I would have to understand the
code first.
> 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
> Priority: Major
>
> 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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