Re: method PdfCopy.fixTaggedStructure throws NullPointerException

Hello,
Thanks a lot for the replay.
Yes, my bad, I should include appendPDF method from the beginning.
Here is the code :
     private static final void appendPDF( final PdfCopy target, final PdfReader source )
           throws BadPdfFormatException, IOException
     {
           final int pages = source.getNumberOfPages();
           for ( int i = 1; i <= pages; i++ )
           {
                target.addPage( target.getImportedPage( source, i ) );
           }
     }


Thank you,
Alexandre Pichtchikov

From: iText mailing list [mailto:[email protected]]
Sent: Thursday, August 07, 2014 10:16 AM
To: Post all your questions about iText here
Subject: Re: [iText-questions] method PdfCopy.fixTaggedStructure throws NullPointerException

On 8/6/2014 10:01 AM, Pichtchikov, Alexandre wrote:
I am merging tagged pdf with untagged pdf. I am getting exception when I close Document object:
    NullPointerException(PdfCopy.java:890)

    Call stack
    com.itextpdf.text.pdf.PdfCopy.fixTaggedStructure(PdfCopy.java:890)
    com.itextpdf.text.pdf.PdfCopy.flushTaggedObjects(PdfCopy.java:866)
    com.itextpdf.text.pdf.PdfDocument.close(PdfDocument.java:855)
    com.itextpdf.text.Document.close(Document.java:416)
    ......
Code:
        PdfReader basePDF = new PdfReader( byteArray );
        PdfReader legendInformation = new PdfReader( legendsStaticPDFs.get( language ) );

        boolean isBasePDFTagged = basePDF.isTagged();
        boolean islegendInformationTagged = legendInformation.isTagged();

        // Representation of the resultant, merged, PDF
        Document document = new Document( basePDF.getPageSize( 1 ) );

        // Wrap the target PDF in something concrete to facilitate adding pages
        ByteArrayOutputStream outputStreamNew = new ByteArrayOutputStream();
        PdfCopy newPDF = new PdfCopy( document, outputStreamNew );
        newPDF.setTagged();
        // Set the PDF language (Accessibility standards)
        newPDF.getExtraCatalog().put(PdfName.LANG,
            new PdfString( language.locale.getLanguage() ) );

        // Set the PDF document title (Accessibility standards)
        newPDF.getInfo().put(PdfName.TITLE, new PdfString(
                messageSourceAccessor.getMessage(
                        "statement.pdf.title." + language.locale.getLanguage() ) ) );

        document.open();
        appendPDF( newPDF, basePDF );
        //appendPDF( newPDF, legendInformation );
        document.close();
I checked this Merging Tagged PDF without ruining the tags<http://stackoverflow.com/questions/19839445/merging-tagged-pdf-without-ruining-the-tags>, and have found that it should be fixed, but it still exist at least in iText 5.5.2 I used. Is it any work around? Could PageName.PG be set manually? Thanks in advance.
It looks like NullPointerException(PdfCopy.java:890) is generated at this line:

HashMap<Integer, PdfIndirectReference> numTree = structureTreeRoot.getNumTree();//iText 5.5.2;PdfCopy.java:890

structureTreeRoot can be null in case the method getImportedPage(PdfReader, int, boolean) was used without keeping tagged structure (which would be wrong use of iText). Unfortunately, this code is hidden in your appendPDF() method so we can't check if you're doing something wrong or if there's really a problem inside iText.

The issue with a PG key has been fixed in iText 5.5.0.

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