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https://issues.apache.org/jira/browse/PDFBOX-3001?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14965542#comment-14965542
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Adam Hooper commented on PDFBOX-3001:
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Attached a patch that fixes the issue for me.
> FileSystemFontProvider cache instability
> ----------------------------------------
>
> Key: PDFBOX-3001
> URL: https://issues.apache.org/jira/browse/PDFBOX-3001
> Project: PDFBox
> Issue Type: Bug
> Affects Versions: 2.0.0
> Reporter: John Hewson
> Assignee: John Hewson
> Attachments: patch
>
>
> FileSystemFontProvider uses Java's Preferences API to cache font metadata,
> however it doesn't seem to work out of the box on Windows (due to file
> permissions) and one user on the mailing list has complained that on Linux
> file paths with more than 80 characters can't be handed. Serializable is also
> slow.
> It looks like Preferences wasn't a good choice here. We're going to need to
> roll our own cache file format and save it somewhere we have write access to.
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