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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