IText

PdfReader r = null;   
        byte[] b = null;   
        ByteArrayInputStream bais = new ByteArrayInputStream("Rodrigo".getBytes());   
        ByteArrayOutputStream baos = new ByteArrayOutputStream();   
            r = new PdfReader(bais);   
            PdfStamper stamper = new PdfStamper(r,baos);   
            PdfContentByte over = stamper.getOverContent(1);   
            Image img = Image.getInstance("C:\\logo.bmp");   
            img.setAbsolutePosition(5, 5);   
            PdfContentByte under;   
            int total = r.getNumberOfPages() + 1;   
            for (int i = 1; i < total; i++) {   
            under = stamper.getUnderContent(i);   
            under.addImage(img);   
            }   
            stamper.close();

Exception in thread “main” java.io.IOException: PDF header signature not found.

at com.lowagie.text.pdf.PRTokeniser.checkPdfHeader(Unknown Source)

at com.lowagie.text.pdf.PdfReader.readPdf(Unknown Source)

at com.lowagie.text.pdf.PdfReader.(Unknown Source)

at com.lowagie.text.pdf.PdfReader.(Unknown Source)

at teste.main(teste.java:29)