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https://issues.apache.org/jira/browse/PDFBOX-5297?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17437849#comment-17437849
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Michael Klink commented on PDFBOX-5297:
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{quote}Please have a look and feel free to comment{quote}
It is improved insofar as you take the full first token until a space
character. Nonetheless, there are many *DA* forms your code will misinterpret.
{quote}I'm not sure how to parse the DA into instructions, find the Font
setting one and grab the first argument. Could you elaborate?{quote}
You might want to have a look at the PDFBox class
{{org.apache.pdfbox.pdmodel.interactive.form.PDDefaultAppearanceString}}, in
particular its {{processAppearanceStringOperators}} method and the other
{{process...}} method called from there. This is how PDFBox extracts text font,
text size, and text color information from the *DA* string.
{quote}Also, could you elaborate on what the set of Font names that should be
supported, even if they're not found in the *DR*?{quote}
Strictly speaking, i.e. according to the specification, _none at all_.
Nonetheless, Adobe Acrobat (and many other PDF form-fillers following Adobe's
lead) accept a set of font names even if they are not defined in the *DR*, see
[this PDFBox-1234
comment|https://issues.apache.org/jira/browse/PDFBOX-1234?focusedCommentId=14304601#comment-14304601].
> class org.apache.pdfbox.cos.COSName cannot be cast to class
> org.apache.pdfbox.cos.COSString
> -------------------------------------------------------------------------------------------
>
> Key: PDFBOX-5297
> URL: https://issues.apache.org/jira/browse/PDFBOX-5297
> Project: PDFBox
> Issue Type: Bug
> Components: AcroForm
> Affects Versions: 2.0.24
> Reporter: Chris Newhouse
> Assignee: Tilman Hausherr
> Priority: Major
> Fix For: 2.0.25, 3.0.0 PDFBox
>
>
> A customer provided us with a PDF that contains an AcroForm and has some of
> the data filled in. There are various ways to trigger the error, but here's a
> stacktrace:
> {code:java}
> class org.apache.pdfbox.cos.COSName cannot be cast to class
> org.apache.pdfbox.cos.COSString (org.apache.pdfbox.cos.COSName and
> org.apache.pdfbox.cos.COSString are in unnamed module of loader 'app')
> at
> org.apache.pdfbox.pdmodel.interactive.form.PDVariableText.getDefaultAppearanceString(PDVariableText.java:91)
> at
> org.apache.pdfbox.pdmodel.interactive.form.AppearanceGeneratorHelper.<init>(AppearanceGeneratorHelper.java:114)
> at
> org.apache.pdfbox.pdmodel.interactive.form.PDTextField.constructAppearances(PDTextField.java:263)
> at
> org.apache.pdfbox.pdmodel.interactive.form.PDAcroForm.refreshAppearances(PDAcroForm.java:331)
> at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native
> Method)
> at
> java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> at
> java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.base/java.lang.reflect.Method.invoke(Method.java:566){code}
> The PDF contains sensitive user information, so I cannot post it here
> publicly, but I'd be willing to submit it to a private upload area. When I
> use an editor to remove/change the sensitive data, the problem goes away or
> sprouts up as a different error (related to fonts).
>
> Here is a little bit of metadata I can provide right now:
> {code:java}
> {
> "Author": "SE:W:CAR:MP",
> "CreationDate": "D:20211012165530Z00'00'",
> "Creator": "Adobe LiveCycle Designer ES 9.0",
> "Keywords": "Fillable",
> "ModDate": "D:20211012165530Z00'00'",
> "Producer": "macOS Version 10.15.7 (Build 19H1417) Quartz PDFContext",
> "Subject": "Request for Taxpayer Identification Number and Certification",
> "Title": "Form W-9 (Rev. October 2018)"
> }{code}
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