This sample reproduces the Acrobat feature "Replace Pages". It will change the page content but leave the form fields in place.

ReplacePages.java

/*
 * Copyright Datalogics, Inc. 2015
 */

package pdfjt.cookbook.document;

import com.adobe.internal.io.ByteReader;
import com.adobe.internal.io.ByteWriter;
import com.adobe.internal.io.InputStreamByteReader;
import com.adobe.pdfjt.pdf.document.PDFDocument;
import com.adobe.pdfjt.pdf.document.PDFOpenOptions;
import com.adobe.pdfjt.pdf.document.PDFSaveFullOptions;
import com.adobe.pdfjt.pdf.page.PDFPage;
import com.adobe.pdfjt.services.manipulations.PMMOptions;
import com.adobe.pdfjt.services.manipulations.PMMService;
import java.io.InputStream;
import java.net.URL;

import pdfjt.util.SampleFileServices;

/**
 * This sample reproduces the Acrobat feature "Replace Pages". It will change
 * the page content but leave the form fields in place.
 */
public class ReplacePages {
    
    private static final String inputPDF = "http://dev.datalogics.com/cookbook/document/FruitForm_2014.pdf";
    private static final String repacementPDF = "http://dev.datalogics.com/cookbook/document/FruitForm_2015.pdf";
    private static final String outputDir = "cookbook/Document/output/";

	static public void main(String[] args) throws Exception 
	{
		SampleFileServices.createDir(outputDir);
		try
		{
			//First read in the PDF files
		    InputStream fis = new URL(inputPDF).openStream();
            ByteReader byteReader = new InputStreamByteReader(fis);
            PDFDocument pdfDocument = PDFDocument.newInstance(byteReader, PDFOpenOptions.newInstance());
            
            fis = new URL(repacementPDF).openStream();
            byteReader = new InputStreamByteReader(fis);
            PDFDocument pdfReplacementDocument = PDFDocument.newInstance(byteReader, PDFOpenOptions.newInstance());
                        
            /*
             * Resources are not easily copied from one PDF to another so we use
             * the PMMService class to insert the replcement page into the
             * original PDF. We'll delete it after we get what we need from it.
             */
            PMMService pageManipulator = new PMMService(pdfDocument);
            /*
             * Add the replacement page before the first page of the document.
             */
            pageManipulator.insertPages(pdfReplacementDocument, null, null, PMMOptions.newInstanceAll());
            
            /*
             * Get the pages we need to copy the annotations to and from.
             */
            PDFPage originalPageOne = pdfDocument.requirePages().getPage(1);
            PDFPage replacementPageOne = pdfDocument.requirePages().getPage(0); 
            /*
             * Create the Annots dictionary for the new page and then populate
             * it with the annotations from the original, then delete it.
             */
            replacementPageOne.procureAnnotationList().addAnnotations(originalPageOne.getAnnotationList());
            /*
             * Remove the annotations from the orignial page or else the
             * annotations from both pages will get removed when the original
             * page is deleted.
             */
            originalPageOne.removeAnnotationList();
            pageManipulator.deletePages(originalPageOne, 1);
            
			ByteWriter outputFile = SampleFileServices.getRAFByteWriter(outputDir + "FruitForm_2015_New.pdf");
			pdfDocument.save(outputFile, PDFSaveFullOptions.newInstance());
		} finally {
		    //
		}
	}
	
}