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https://issues.apache.org/jira/browse/PDFBOX-3024?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15034153#comment-15034153
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John Hewson commented on PDFBOX-3024:
-------------------------------------
It's worth mentioning that CID 0 is the "missing CID", just like GID 0 is the
missing glyph.
> Preflight validation call PDType0Font.clear at the wrong time
> -------------------------------------------------------------
>
> Key: PDFBOX-3024
> URL: https://issues.apache.org/jira/browse/PDFBOX-3024
> Project: PDFBox
> Issue Type: Bug
> Components: Preflight
> Affects Versions: 1.8.10
> Reporter: Guillaume Monteils
> Attachments: 004973.pdf, PDF-Tools.png, PDFBox.png, eclipse-1.jpg,
> eclipse-2.jpg
>
>
> I used the algorythm here to test PDF / A compliance :
> https://pdfbox.apache.org/1.8/cookbook/pdfavalidation.html
> With one pdf document (which i cant give you due to confidentiality), an
> NullPointerException occur here :
> {code}
> java.lang.NullPointerException
> at
> org.apache.pdfbox.pdmodel.font.PDType0Font.getFontWidth(PDType0Font.java:188)
> at
> org.apache.pdfbox.preflight.font.container.FontContainer.checkGlyphWith(FontContainer.java:114)
> at
> org.apache.pdfbox.preflight.content.ContentStreamWrapper.validText(ContentStreamWrapper.java:372)...
> {code}
> As i dug deeper, i found that preflight loads a font context where it puts
> all pdf fonts. The PDType0Font is also created and put in this context.
> {code}
> (CSObject :
> COSDictionary{(COSName{BaseFont}:COSName{INWHIX+TimesNewRomanPSMT})
> (COSName{DescendantFonts}:COSArray{[COSObject{349, 0}]})
> (COSName{Encoding}:COSName{Identity-H})
> (COSName{Subtype}:COSName{Type0})
> (COSName{ToUnicode}:COSDictionary{(COSName{Filter}:COSName{FlateDecode})
> (COSName{Length}:COSInt{260}) }) (COSName{Type}:COSName{Font}) })
> {code}
> The problem is that at the end of one step of the analysis, the clear method
> is called on the PDType0Font (see eclipse-1.jpg), but the font is still
> present in the context. On a second step, the same font is retrieved from the
> context, with no data in it, and the NullPointerException occurs (see
> eclipse-2.jpg).
> I tried the validation after removing the clear method from PDType0Font and
> it works just fine.
> I think the problem comes from this context, and a clear on a font should
> also trigger a deletion in this map.
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