Dear iText community,

 

I’m trying to copy a pdf containing a form (copy.mergeFields()), while limiting the memory usage(copy.freeReader(reader)) with code similar to this main class:

 

import java.io.ByteArrayOutputStream;

import java.io.IOException;

 

import com.itextpdf.text.Document;

import com.itextpdf.text.DocumentException;

import com.itextpdf.text.pdf.PdfCopy;

import com.itextpdf.text.pdf.PdfReader;

 

public class MergeFormFreeReader {

 

       public static void main(String[] args) throws DocumentException, IOException {

             Document document = new Document();

             ByteArrayOutputStream baos = new ByteArrayOutputStream();

             PdfCopy copy = new PdfCopy(document, baos);

             copy.setMergeFields();

             document.open();

 

             PdfReader reader = new PdfReader("PDF_FORM.pdf");

             copy.addDocument(reader);

             copy.freeReader(reader);

            

             document.close();

       }

}

 

The stacktrace:

 

Exception in thread "main" java.lang.NullPointerException

       at com.itextpdf.text.pdf.PdfCopy.updateReferences(PdfCopy.java:1359)

       at com.itextpdf.text.pdf.PdfCopy.updateReferences(PdfCopy.java:1364)

       at com.itextpdf.text.pdf.PdfCopy.updateReferences(PdfCopy.java:1364)

       at com.itextpdf.text.pdf.PdfCopy.addToBody(PdfCopy.java:736)

       at com.itextpdf.text.pdf.PdfCopy.branchForm(PdfCopy.java:1464)

       at com.itextpdf.text.pdf.PdfCopy.createAcroForms(PdfCopy.java:1337)

       at com.itextpdf.text.pdf.PdfCopy.flushAcroFields(PdfCopy.java:792)

       at com.itextpdf.text.pdf.PdfDocument.close(PdfDocument.java:862)

       at com.itextpdf.text.Document.close(Document.java:416)

       at MergeFormFreeReader.main(MergeFormFreeReader.java:27)

 

Immediate cause: In PdfCopy.updateReferences it is assumed that the readers are stored (in indirectMap), while in fact the reader was ‘freed’.

 

If I remove copy.freeReader(reader), MergeFormFreeReader produces a pdf, but I really want to use freeReader because I’m merging potentially a lot of pdfs.

If I remove copy.setMergeFields(), MergeFormFreeReader also produces a pdf, but now I’m not sure what will happen if a merge forms containing same field names, etc..

 

While writing this mail, I think I’m going to verify if it’s possible to flatten all forms before merging, but in any case:

·         Is this a bug, or is it simply not possible to merge forms, while freeing readers?

·         Any suggestions for a work-around? Rename all fields myself, etc

 

Emiel Ackermann




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