Hi, I want put the watermark into the pdf, but I receive this error message:
java.lang.NullPointerException
at
com.itextpdf.text.pdf.internal.PdfA1Checker.checkPdfObject(PdfA1Checker.java:304)
at
com.itextpdf.text.pdf.internal.PdfAChecker.checkPdfAConformance(PdfAChecker.java:201)
at
com.itextpdf.text.pdf.internal.PdfAConformanceImp.checkPdfIsoConformance(PdfAConformanceImp.java:70)
at
com.itextpdf.text.pdf.PdfWriter.checkPdfIsoConformance(PdfWriter.java:3380)
at
com.itextpdf.text.pdf.PdfWriter.checkPdfIsoConformance(PdfWriter.java:3376)
at com.itextpdf.text.pdf.PdfDictionary.toPdf(PdfDictionary.java:136)
at
com.itextpdf.text.pdf.PdfIndirectObject.writeTo(PdfIndirectObject.java:157)
at com.itextpdf.text.pdf.PdfWriter$PdfBody.write(PdfWriter.java:424)
at com.itextpdf.text.pdf.PdfWriter$PdfBody.add(PdfWriter.java:402)
at com.itextpdf.text.pdf.PdfWriter.addToBody(PdfWriter.java:886)
at com.itextpdf.text.pdf.PdfStamperImp.close(PdfStamperImp.java:398)
at com.itextpdf.text.pdf.PdfStamperImp.close(PdfStamperImp.java:372)
at com.itextpdf.text.pdf.PdfStamper.close(PdfStamper.java:207)
at WatermarkPDF.main(WatermarkPDF.java:44)
public static void main(String[] args) {
try {
PdfReader Read_PDF_To_Watermark = new PdfReader("C:/SampleA.pdf");
int number_of_pages = Read_PDF_To_Watermark.getNumberOfPages();
PdfAStamper stamp = new PdfAStamper(Read_PDF_To_Watermark, new
FileOutputStream("C:/SampleAWM.pdf"),PdfAConformanceLevel.PDF_A_1A);
int i = 0;
Image watermark_image = Image.getInstance("C:/watermark.jpg");
watermark_image.setAbsolutePosition(200, 400);
PdfContentByte add_watermark;
while (i < number_of_pages) {
i++;
add_watermark = stamp.getUnderContent(i);
add_watermark.addImage(watermark_image);
}
stamp.close();
}
catch (Exception i1) {
i1.printStackTrace();
}
}
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