Font issue with PDFtk

Question

I'm having difficulties filling in a form using pdftk with text fields with true type fonts.

• Font files (.ttf) are added to /Library/Fonts (OSX Mavericks)
• The form is created with Adobe Acrobat Pro
• The form includes normal (non form) text using these fonts
• The form text fields also use these fonts
• The form can successfully be filled and printed using Adobe Acrobat Pro and even Preview

However, pdftk throws an error when trying to fill it using the command:

pdftk ./my_form.pdf fill_form my_data.fdf output ./the_output.pdf

The output is:

Unhandled Java Exception in create_output():
java.lang.ArrayIndexOutOfBoundsException: 0
   at pdftk.com.lowagie.text.pdf.DocumentFont.fillEncoding(pdftk)
   at pdftk.com.lowagie.text.pdf.DocumentFont.doType1TT(pdftk)
   at pdftk.com.lowagie.text.pdf.DocumentFont.<init>(pdftk)
   at pdftk.com.lowagie.text.pdf.AcroFields.getAppearance(pdftk)
   at pdftk.com.lowagie.text.pdf.AcroFields.setField(pdftk)
   at pdftk.com.lowagie.text.pdf.AcroFields.setFields(pdftk)

If I change the font of the text inputs to Helvetica, Times Roman or Courier, pdftk will successfully create a PDF. Oddly though, Arial and Georgia also throw the same error.

I have tried to no avail to embed the fonts in the PDF using Ghostscript as suggested in this question How to repair a PDF file and embed missing fonts. gs may have embedded the fonts, but it removes the form fields so the resulting PDF can't feed back into pdftk.

A working resolution would be greatly appreciated.

Answer 1

I was getting the same java.lang.ArrayIndexOutOfBoundsException: 0 error using pdftk to fill forms on an Adobe Acrobat generated PDF. This question is super old, but I couldn't find a consistent answer on stackoverflow or elsewhere so I figured I'd post my fix.

What ended up working for me:

1. Opening the PDF in the OS X app Preview
2. Clicking into a form field, adding text then deleting that text (so nothing is actually changed)

3. Saving it

4. Running the PDF through pdftk again

I'm not that familiar with encoding or PDFs in general, but saving the PDF with Preview seems to fix the encoding or at least get it to a place where pdftk can work with it. Good luck.

Answer 2

This was causing a huge headache for me for 2 days. It turns out I was focusing on the wrong end of the problem.

A nice alternative that isn't as manual and only has to be done once is to enter some text in a field of the source PDF form, in your case ./my_form.pdf. I don't know EXACTLY why this works, but it does. that way if you want to create a new file at any time, you dont have to go through this trouble :)