I've got a similar problem. I want to add new layer to a PDF document,
already containing several layers. The most obvious way would be something
like this:
PdfReader reader = new PdfReader(new
RandomAccessFileOrArray("c:\\books\\new book.pdf"), null);
PdfStamper stamper = new PdfStamper(reader,new
FileOutputStream("c:\\books\\new book2.pdf"));
PdfContentByte cbl = stamper.getOverContent(1);
cbl.beginLayer(new PdfLayer("additional layer",
stamper.getWriter()));
/* here i add some content */
cbl.endLayer();
stamper.close();
But the result PDF contains only one layer (yep, only "additional layer"
i've just added). After some random tries i found, that if i call
stamper.getPdfLayers() before adding new layer and after it, all the layers
(old and newly added) are in the map, returned after second call. But if i
call getPdfLayers() after adding "additional layer", returned map contains
only this "additional layer". Quite glad with myself for that finding, i
call getPdfLayers(), then add new layer, then call close() on PdfStamper
object i use... and get this same exception:
Exception in thread "main" java.lang.NullPointerException
at com.itextpdf.text.pdf.PdfWriter.fillOCProperties(PdfWriter.java:2585)
at com.itextpdf.text.pdf.PdfStamperImp.close(PdfStamperImp.java:189)
at com.itextpdf.text.pdf.PdfStamper.close(PdfStamper.java:189)
at pdftest.Main.main(Main.java:118)
Line 2585 reads like this:
if (OCGRadioGroup.size() > 0)
...
and yes, OCGRadioGroup was null. After searching the iText code i found the
problem is with method readOCProperties() in PdfStamperImp class (it is
called first thing in getPdfLayers() in the same class), which ends with
documentOCG.addAll(ocgmap.values());
OCGRadioGroup = d.getAsArray(PdfName.RBGROUPS);
OCGLocked = d.getAsArray(PdfName.LOCKED);
if (OCGLocked == null)
OCGLocked = new PdfArray();
And sure thing, if PDF does not contain any optional content groups with
radio button behavior, field OCGRadioGroup becomes null. I added
if (OCGRadioGroup == null)
OCGRadioGroup = new PdfArray();
after line 1606 in PdfStamperImp, rebuilt iText with ant and the problem was
resolved. Can't say if it'll affect anything else...
P.S. I used iText 5.0.6, downloaded from svn about a week ago (last
wednesday to be exact).
--
View this message in context:
http://itext-general.2136553.n4.nabble.com/remove-watermark-layer-tp2264258p3234481.html
Sent from the iText - General mailing list archive at Nabble.com.
------------------------------------------------------------------------------
Special Offer-- Download ArcSight Logger for FREE (a $49 USD value)!
Finally, a world-class log management solution at an even better price-free!
Download using promo code Free_Logger_4_Dev2Dev. Offer expires
February 28th, so secure your free ArcSight Logger TODAY!
http://p.sf.net/sfu/arcsight-sfd2d
_______________________________________________
iText-questions mailing list
iText-questions@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/itext-questions
Many questions posted to this list can (and will) be answered with a reference
to the iText book: http://www.itextpdf.com/book/
Please check the keywords list before you ask for examples:
http://itextpdf.com/themes/keywords.php
