This is the code:
try {
com.lowagie.text.pdf.PdfReader reader = new
com.lowagie.text.pdf.PdfReader("D:\\images\\3 Layers.pdf");
String res = "D:\\images\\layers.pdf";
com.lowagie.text.Document document = new
com.lowagie.text.Document();
com.lowagie.text.pdf.PdfWriter writer =
com.lowagie.text.pdf.PdfWriter.getInstance(document,
new java.io.FileOutputStream(res));
document.open();
com.lowagie.text.pdf.PdfStamper stamper = new
com.lowagie.text.pdf.PdfStamper(reader, new java.io.FileOutputStream(res));
com.lowagie.text.pdf.PdfContentByte cb =
writer.getDirectContent();
Map<String, com.lowagie.text.pdf.PdfLayer> map =
stamper.getPdfLayers();
for (Iterator<String> it = map.keySet().iterator();
it.hasNext(); ) {
String key = (String)it.next();
com.lowagie.text.pdf.PdfLayer layer =
(com.lowagie.text.pdf.PdfLayer)map.get(key);
System.out.println(key + " : layer is on " +
layer.isOn() + " is on
panel " + layer.isOnPanel());
if (!layer.isOn()) {
continue;
}
cb.beginLayer(layer);
cb.endLayer();
}
document.close();
} catch (Exception e) {
e.printStackTrace();
}
The code issues a null pointer exception on document.close():
java.lang.NullPointerException
at com.lowagie.text.pdf.PdfWriter.getNewObjectNumber(Unknown Source)
at com.lowagie.text.pdf.PRIndirectReference.toPdf(Unknown Source)
at com.lowagie.text.pdf.PdfDictionary.toPdf(Unknown Source)
at com.lowagie.text.pdf.PdfDictionary.toPdf(Unknown Source)
at com.lowagie.text.pdf.PdfDictionary.toPdf(Unknown Source)
at com.lowagie.text.pdf.PdfIndirectObject.writeTo(Unknown Source)
at com.lowagie.text.pdf.PdfWriter$PdfBody.add(Unknown Source)
at com.lowagie.text.pdf.PdfWriter$PdfBody.add(Unknown Source)
at com.lowagie.text.pdf.PdfWriter$PdfBody.add(Unknown Source)
at com.lowagie.text.pdf.PdfWriter.addToBody(Unknown Source)
at com.lowagie.text.pdf.PdfPages.addPage(Unknown Source)
at com.lowagie.text.pdf.PdfWriter.add(Unknown Source)
at com.lowagie.text.pdf.PdfDocument.newPage(Unknown Source)
at com.lowagie.text.pdf.PdfDocument.close(Unknown Source)
at com.lowagie.text.Document.close(Unknown Source)
at TestDriver.PDF(TestDriver.java:105)
at TestDriver.main(TestDriver.java:75)
Why? What should I do to prevent this exception?
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