class AddMessageToEachPage
{
    /**
     * Constructor.
     */
    public AddMessageToEachPage()
    {
        super();
    }

    /**
     * create the second sample document from the PDF file format specification.
     *
     * @param file The file to write the PDF to.
     * @param message The message to write in the file.
     * @param outfile The resulting PDF.
     *
     * @throws IOException If there is an error writing the data.
     */
    public void doIt( String file, String message, String  outfile ) throws IOException
    {
        try (PDDocument doc = Loader.loadPDF(new File(file)))
        {
            PDFont font = new PDType1Font(FontName.HELVETICA_BOLD);
            float fontSize = 36.0f;

            for( PDPage page : doc.getPages() )
            {
                PDRectangle pageSize = page.getMediaBox();
                float stringWidth = font.getStringWidth( message )*fontSize/1000f;
                // calculate to center of the page
                int rotation = page.getRotation();
                boolean rotate = rotation == 90 || rotation == 270;
                float pageWidth = rotate ? pageSize.getHeight() : pageSize.getWidth();
                float pageHeight = rotate ? pageSize.getWidth() : pageSize.getHeight();
                float centerX = rotate ? pageHeight/2f : (pageWidth - stringWidth)/2f;
                float centerY = rotate ? (pageWidth - stringWidth)/2f : pageHeight/2f;

                // append the content to the existing stream
                try (PDPageContentStream contentStream = new PDPageContentStream(doc, page, AppendMode.APPEND, true, true))
                {
                    contentStream.beginText();
                    // set font and font size
                    contentStream.setFont( font, fontSize );
                    // set text color to red
                    contentStream.setNonStrokingColor(Color.red);
                    if (rotate)
                    {
                        // rotate the text according to the page rotation
                        contentStream.setTextMatrix(Matrix.getRotateInstance(Math.PI / 2, centerX, centerY));
                    }
                    else
                    {
                        contentStream.setTextMatrix(Matrix.getTranslateInstance(centerX, centerY));
                    }
                    contentStream.showText(message);
                    contentStream.endText();
                }
            }

            doc.save( outfile );
        }
    }

    /**
     * This will create a hello world PDF document.
     * <br>
     * see usage() for commandline
     *
     * @param args Command line arguments.
     */
    public static void main(String[] args) throws IOException
    {<FILL_FUNCTION_BODY>}

    /**
     * This will print out a message telling how to use this example.
     */
    private void usage()
    {
        System.err.println( "usage: " + this.getClass().getName() + " <input-file> <Message> <output-file>" );
    }
}

        AddMessageToEachPage app = new AddMessageToEachPage();
        if( args.length != 3 )
        {
            app.usage();
        }
        else
        {
            app.doIt( args[0], args[1], args[2] );
        }
    
<no_super_class>