PdfStamperImp enhancements for keeping the integrity of the original PDF

[Tenesi <bnasri (at) gmail.com>]

Thanks for the prompt good news.


Would you please let me know what is wrong with this snippet and What would be the right approach to do it?



 FileOutputStream os= new FileOutputStream("final.pdf"); // The target

 com.lowagie.text.pdf.PdfReader baseR = new com.lowagie.text.pdf.PdfReader("base.pdf"); // The base file 

 com.lowagie.text.pdf.PdfStamper update = new
com.lowagie.text.pdf.PdfStamper(baseR, os, '\0',true); // An stamper
prepared for incremental changes


 com.lowagie.text.pdf.PdfWriter stamperImp =update.getWriter(); // The corresponding writer of the appender


//XXX: Add new page?


 stamperImp.setPageEmpty(false);

 stamperImp.newPage();


//Fetch the new page from the additions

 com.lowagie.text.pdf.PdfReader reader2 = new com.lowagie.text.pdf.PdfReader("additions.pdf");

 com.lowagie.text.pdf.PdfImporte

dPage ipage= stamperImp.getImportedPage(reader2,1);

//XXX:Get the under layer to add the imprtedpage into the new page in target?
// A getUnderContent(baseR.getNumberOfPages()+1) on the PdfStamper itself will not help  as the  newPage is not counted properly

 com.lowagie.text.pdf.PdfContentByte under = stamperImp.getDirectContentUnder();

/*Add the page now this operation throws: java.lang.NullPointerException        at com.lowagie.text.pdf.PdfContentByte.addTemplate(PdfContentByte.java:1898)  under.addTemplate(ipage, 1, 0, 0, 1, 0, 0);*/

//commit the updates
 update.close();
 os.close();

Thanks again for your help in advance and best regards