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https://issues.apache.org/jira/browse/PDFBOX-5684?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tilman Hausherr updated PDFBOX-5684:
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Affects Version/s: 2.0.29
> Font cache isn't effective on my machine, always rebuilds
> ---------------------------------------------------------
>
> Key: PDFBOX-5684
> URL: https://issues.apache.org/jira/browse/PDFBOX-5684
> Project: PDFBox
> Issue Type: Bug
> Components: FontBox
> Affects Versions: 2.0.29, 3.0.0 PDFBox
> Environment: macOS 13
> Reporter: Mike Hearn
> Assignee: Tilman Hausherr
> Priority: Major
> Fix For: 2.0.30, 3.0.1 PDFBox
>
>
> I see that FontBox has a font caching implementation. Whenever I try to use
> PDFTextStripped on one specific PDF I have, it triggers the computation of
> this cache (I'm not sure why it doesn't need to for the others). This is very
> slow. If the cache really worked I could live with that but every time, it
> decides the cache isn't valid and rebuilds it.
> The issue is this line here in FileSystemFontProvider.loadDiskCache:
>
> {code:java}
> if (!pending.isEmpty())
> {
> // re-build the entire cache if we encounter un-cached fonts (could be
> optimised)
> LOG.warn("New fonts found, font cache will be re-built");
> return null;
> }
> {code}
> I don't know why "pending" is never empty as I'm not installing new fonts or
> changing my font configuration in any way, but my guess is, if some fonts
> fail to load then they don't enter the cache but this fact isn't recorded. So
> they are always seen as "new". It's just a guess based on the fact that I see
> errors related to being unable to load some fonts during this process, e.g.
> {noformat}
> Could not load font file:
> /System/Library/Fonts/Supplemental/NotoSansBamum-Regular.ttf
> java.io.IOException: Unknown substFormat: 0 @
> org.apache.fontbox.ttf.GlyphSubstitutionTable.readSingleLookupSubTable(GlyphSubstitutionTable.java:372){noformat}
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