You could leave out the page numbers on the documents, then merge the documents and wrtie a simpe java action that adds the pagenumbers afterwards.
An example in pure java is added below, with some small tweaks you should be able to create the Mendix java action for this using the Apache PDFBox library:
import java.io.File;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.PDPageContentStream;
import org.apache.pdfbox.pdmodel.font.PDFont;
import org.apache.pdfbox.pdmodel.font.PDType1Font;
public class AddPageNumbers {
public static void main(String[] args) {
try {
// Load an existing PDF document
File file = new File("existing_document.pdf");
PDDocument document = PDDocument.load(file);
// Get the total number of pages
int totalPages = document.getNumberOfPages();
// Iterate through all pages
for (int i = 0; i < totalPages; i++) {
PDPage page = document.getPage(i);
// Start a new content stream which will "hold" the to be created content
PDPageContentStream contentStream = new PDPageContentStream(document, page, PDPageContentStream.AppendMode.APPEND, true);
// Define the font to use
PDFont font = PDType1Font.HELVETICA;
// Set the font size
float fontSize = 10;
// Calculate x and y coordinates for the page number
float x = page.getMediaBox().getWidth() - fontSize - 5;
float y = fontSize + 5;
// Begin the Content stream
contentStream.beginText();
// Setting the font to the Content stream
contentStream.setFont(font, fontSize);
// Setting the position for the line
contentStream.newLineAtOffset(x, y);
// Adding text
String text = String.format("Page %d of %d", i+1, totalPages);
contentStream.showText(text);
// Ending the content stream
contentStream.endText();
// Closing the content stream
contentStream.close();
}
// Save the modified document
document.save("modified_document.pdf");
// Close the document
document.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
Additonal error handling might be needed depending on your solution in the java action.
Hope this helps in finding a solution for your requiement.
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