The program fails with this exception when i try to concatenate pdf files with
a blank page:
java.lang.NullPointerException
at com.lowagie.text.pdf.PRStream.<init>(Unknown Source)
at com.lowagie.text.pdf.PdfReaderInstance.getFormXObject(Unknown
Source)
at com.lowagie.text.pdf.PdfImportedPage.getFormXObject(Unknown Source)
at com.lowagie.text.pdf.PdfReaderInstance.writeAllPages(Unknown Source)
at com.lowagie.text.pdf.PdfWriter.addSharedObjectsToBody(Unknown
Source)
at com.lowagie.text.pdf.PdfWriter.close(Unknown Source)
at com.lowagie.text.pdf.PdfDocument.close(Unknown Source)
at com.lowagie.text.Document.close(Unknown Source)
The problem comes from the following method vhen the contents variable is null:
PdfStream getFormXObject(int pageNumber) throws IOException {
PdfDictionary page = pages[pageNumber - 1];
PdfObject contents = PdfReader.getPdfObject(page.get
(PdfName.CONTENTS));
PdfDictionary dic = new PdfDictionary();
byte bout[] = null;
ArrayList filters = null;
if (contents != null) {
if (contents.isStream()) {
dic.putAll((PRStream)contents);
}
else {
bout = reader.getPageContent(pageNumber, file);
}
}
dic.put(PdfName.RESOURCES, PdfReader.getPdfObject(page.get
(PdfName.RESOURCES)));
dic.put(PdfName.TYPE, PdfName.XOBJECT);
dic.put(PdfName.SUBTYPE, PdfName.FORM);
PdfImportedPage impPage = (PdfImportedPage)importedPages.get(new
Integer(pageNumber));
dic.put(PdfName.BBOX, new PdfRectangle(impPage.getBoundingBox()));
PdfArray matrix = impPage.getMatrix();
if (matrix == null)
dic.put(PdfName.MATRIX, IDENTITYMATRIX);
else
dic.put(PdfName.MATRIX, matrix);
dic.put(PdfName.FORMTYPE, ONE);
PRStream stream;
if (bout == null) {
stream = new PRStream((PRStream)contents, dic);
}
else {
stream = new PRStream(reader, bout);
stream.putAll(dic);
}
return stream;
}
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