[PDFBOX-4637] improve exception message "IOException: Could not find font: /Helvetica"

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.0.16
• Fix Version/s: 2.0.17, 3.0.0 PDFBox
• Component/s: AcroForm
• External issue URL: https://github.com/TomRoush/PdfBox-Android/issues/197
• Assignee: Tilman Hausherr
• Reporter: Tilman Hausherr
• Created: 26/Aug/19 17:21
• Updated: 30/Jun/20 06:13
• Resolved: 26/Aug/19 17:29

Description

The attached file from the linked issue brings this:

Exception in thread "main" java.io.IOException: Could not find font: /Helvetica
	at org.apache.pdfbox.pdmodel.interactive.form.PDDefaultAppearanceString.processSetFont(PDDefaultAppearanceString.java:179)
	at org.apache.pdfbox.pdmodel.interactive.form.PDDefaultAppearanceString.processOperator(PDDefaultAppearanceString.java:132)
	at org.apache.pdfbox.pdmodel.interactive.form.PDDefaultAppearanceString.processAppearanceStringOperators(PDDefaultAppearanceString.java:108)
	at org.apache.pdfbox.pdmodel.interactive.form.PDDefaultAppearanceString.<init>(PDDefaultAppearanceString.java:86)
	at org.apache.pdfbox.pdmodel.interactive.form.PDVariableText.getDefaultAppearanceString(PDVariableText.java:93)
	at org.apache.pdfbox.pdmodel.interactive.form.AppearanceGeneratorHelper.<init>(AppearanceGeneratorHelper.java:100)
	at org.apache.pdfbox.pdmodel.interactive.form.PDTextField.constructAppearances(PDTextField.java:263)
	at org.apache.pdfbox.pdmodel.interactive.form.PDAcroForm.refreshAppearances(PDAcroForm.java:404)
 

I'll improve the exception message so that a user would have a better understanding what is wrong in this "difficult" PDF.