itext7 | Java represents the next level | Document Editor library

My pom includes the itext7-core artifact.

I'm using itext 7 to sign pdf that has 2 signature fields and itext is printing Error occurred while reading cross reference table. Cross reference table will be rebuilt. The line that is causing error is

I'm exploring different options for .NET PDF libraries. One of my requirements is to place a box at the bottom of the first page and if any of the content reaches the box, it should overflow onto the next page.

For example:

Shown above, paragraph 7 would normally take up some of the space that's occupied by the "reserved" area. Instead, the part that would have taken up that space is shifted to the next page.

That image was achieved using Gembox.Document by adding the box as a footer element that only renders on the first page. However, in iText7, the examples I've seen for adding a footer (such as this one), places the content as a floating element that renders over the existing content and does not affect the layout/flow of the rest of the document.

I also tried adding a paragraph on the PageEnd event handler without the canvas (snippet below), but instead of adding it to the specified page, it's added to the end of the entire document.

I was performing signing using the iText7 library. I tried signing one of the signature fields available on the document but after the signing, it still shows that field is unsigned. The following is the code snippet that I'm using for signing.

I am creating a two column table in a PDF using iText7, and using CreatePercentArray to set the relative column widths (20%, 80%). In the middle of the table, I have a row containing one cell that spans both columns and contains an image.

When the width of the image is small, the column widths are correct. As the width of the image grows, the column widths progressively change until both are 50%, even though the image width is smaller than the combined width of the columns.

I'm using itext7 (7.1.16) to produce PDF. When i try to write to disk all is ok. When i'm trying to send back client (without saving on disk) nothing happens.

I associated this piece of code to Asp button but nothing happens (no errors and no goal). I've seen other thread where this piece of code has no problem. I can't understand where i put my hands.

I have an issue with digitally signing PDF documents that have been marked as PDF/A - 3A compliant. With PDFBox (latest version, 2.0.24) I get in the end an invalid signature in Adobe Acrobat, while with iText7 (latest version) I get a valid signature. The goal is to get PAdES LTV compliant signatures.

My process is the following (with both PDFBox and iText7):

• I open the PDF, I create the hash for signing (data to be signed)
• I call the 3rd party service for getting back the digital signature
• In the service response I also get the OCSP and CRL content that I need to embed in the PDF for LTV quality
• I embed the signature in the PDF
• I save the document to memory, then I reopen it for embedding the OCSP and CRL
• I embed the OCSP and CRL items, creating the respective DSS and VRI dictionaries
• I save the PDF to disk

For PDFBox, the code for signing is here and for OCSP/CRL embedding is here. For iText7, the code for signing and for OCSP/CRL embedding is here.

Now, this works OK for most PDF files, including multi-signature documents. The problem is with one particular PDF, that is created as PDF/A compliat, level 3A.

With PDFBox, if I just embed the signature and open the document in Adobe Acrobet, the signature is valid. If I also embed the OCSP/CRL content, the signature is no longer valid. Adobe Acrobat complains that:

Signature is invalid: Document has been altered or corrupted since it was signed.

I also noticed that just by doing:

I am using iText7's PDF Optimizer product. It is very simple to use, but it is not reducing the image quality and size of my PDF at all. I'm using exactly same code as given in their product's live LIVE DEMO, but it is not working as documented. I'm using it's C# version. I tried toggling image_scalar_level and compression_level as given in code, but it did not make any impact. If I upload same PDF file for testing their demo, it works fine. What am I doing wrong? Any help/guidelines would be appreciated.

EDIT: (adding code that I'm using, as request)

I was looking to set PDF annotation using iText7 and encountered a problem. Unlike rest of PDF document, where you using PDF stream objects to show content - annotation can be set only with PDF string.

But it shows glyphs in microsoft edge reader mode, like this:

@8-72...