Re: 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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