What I would suggest is to create a barcode with the settings you would like to 
see applied in Adobe Acrobat and recreate that
in PDFBox. There is no high level API in PDFBox for that so you need to work 
with the field and the widget annotation
COSDirectory directly.

You can start by creating a text field in PDFBox (as a barcode field is a 
subtype of that) and use getCOSObject() on the PD
model field and widget object.

As for the calculation you need to inject the correct JS code (again I'd do 
some prototyping in Acrobat) into the action
dictionaries.

>From your response I get that you are aware that this will only work in Adobe 
>Acrobat. To use it with Adobe Reader you need to
ensure that the correct usage rights have been applied to the PDF before 
filling.

There is a reason that you are looking to create the PDF form with PDFBox right?

I've not done that before but feel free to ask further questions. My time is 
very limited these days but I'll try to help you as
much as possible. Might also serve as a starter for an example.

BR
Maruan



> Yes, that's correct.
> 
> The end user is going to use Acrobat. I'm aware that this will not work in
> Reader without some special rights applied to the file, but that is not
> currently a concern.
> 
> On Tue, Feb 25, 2020 at 5:39 PM Maruan Sahyoun <sahy...@fileaffairs.de>
> wrote:
> 
> > Hi Gilad,
> > 
> > so if I understand you correctly you are creating a PDF form with PDFBox,
> > maybe prefill it and later on a user is filling out
> > the form interactively. Now some of the fields should contain a dynamic
> > barcode with the value being calculated from some other
> > fields values. Is that correct? What's the end users application for
> > filling out the PDF?
> > 
> > BR
> > Maruan
> > 
> > > The problem with that approach is that the image is static, while I want
> > a
> > > field whose value can be changed (based on the value of another field).
> > > 
> > > On Tue, Feb 25, 2020 at 4:30 PM PDF Developer <pdf...@yahoo.com.invalid>
> > > wrote:
> > > 
> > > >  Hello Gilad,
> > > > 
> > > > I suppose you could define a form button and assign the appearance to
> > be
> > > > an image file, generated perhaps from Barcode4J. I use that trick in
> > > > Acrobat Pro to add content to PDFs, content I have scanned to PDF.
> > > > 
> > > > I went down a different route and added barcodes as XObjects. Using the
> > > > Okapi library, I wrote a very simple (no text) PDF Renderer based on
> > their
> > > > SVG one and took the output from that renderer and wrapped it as an
> > XObject.
> > > > PDFDev
> > > > 
> > > >     On Tuesday, February 25, 2020, 3:09:57 PM GMT, Gilad Denneboom <
> > > > gilad.denneb...@gmail.com> wrote:
> > > > 
> > > >  Any ideas? I saw an old post of yours where you write that maybe this
> > can
> > > > be done with Barcode4J, but I think that would just generate the
> > barcode as
> > > > an image, not as a field.
> > > > 
> > > > On Sun, Feb 23, 2020 at 11:20 PM Gilad Denneboom <
> > > > gilad.denneb...@gmail.com>
> > > > wrote:
> > > > 
> > > > > DataMatrix
> > > > > 
> > > > > On Sun, Feb 23, 2020 at 3:41 PM Maruan Sahyoun <
> > sahy...@fileaffairs.de>
> > > > > wrote:
> > > > > 
> > > > > > Hi Gilad,
> > > > > > 
> > > > > > what type of barcode would you like to generate?
> > > > > > 
> > > > > > BR
> > > > > > Maruan
> > > > > > 
> > > > > > > Hi all,
> > > > > > > 
> > > > > > > Does anyone have any pointers on how to create a Barcode field
> > using
> > > > > > PDFBox?
> > > > > > > As far as I can see it's a text field, but with some special
> > > > properties,
> > > > > > > such as the PaperMetaData (PMD) object, and a calculation script
> > with
> > > > > > > specific JS code for copying the value from other fields.
> > > > > > > I can handle the latter, but the former seems quite difficult to
> > > > > > implement,
> > > > > > > so any help would be appreciated.
> > > > > > > 
> > > > > > > Thanks in advance,
> > > > > > > Gilad
> > > > > > 
> > > > > > 
> > ---------------------------------------------------------------------
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> > > > > > 
> > > > > > 
> > 
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> > 
> > 
-- 
Maruan Sahyoun

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