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https://issues.apache.org/jira/browse/PDFBOX-5007?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17226020#comment-17226020
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Maruan Sahyoun commented on PDFBOX-5007:
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Well - a dynamic XFA consists basically of a template, data and scripting. An 
XFA processor will take that and render it into what you see on screen (using a 
supporting viewer). So the resulting document is generated on the fly. E.g. a 
template might have a definition for a single data line of a purchase order. No 
supplying (or entering) data for multiple lines the XFA processor takes the 
data creates a runtime model of the template and the binding result of the data 
into what might now be a purchase order with several hundred lines.

What changes are required:
- use a XFA processor to render the XFA together with the data being held into 
a PDF document or
- save the Form in Adobe Form Designer into a *static* PDF. You can the merge it

Added note. I'm working a lot with XFA based forms and workflows for customers. 
Using the proper software this can be a good technology. But pdfbox is not (and 
likely will not) be an XFA processor. For Firefox or others you need to ask the 
appropriate projects.

I will be closing the ticket - for further questions please do use the users 
mailinglist https://pdfbox.apache.org/mailinglists.html but be aware that - 
again - pdfbox can't help.

> Content not visible after merging pdf with another pdf
> ------------------------------------------------------
>
>                 Key: PDFBOX-5007
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-5007
>             Project: PDFBox
>          Issue Type: Bug
>          Components: AcroForm
>            Reporter: Ashish Yadav
>            Priority: Major
>              Labels: XFA
>         Attachments: Accredo pdf blank .pdf, image-2020-11-04-11-11-50-629.png
>
>
> Pdf content is not visible after merging the pdf with another pdf. Please 
> find the attached error message while viewing the pdf file.



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