Not a Question. I have a piece of source to contribute ;-)

[ÎÏÎÎÎÎÏ ÎÎÎÎÎÎÎÏ <i.canellos (at) alpha-inf.gr>]

I've been seeking ways to direct send a pdf file to the printer, without 
having to use external programms such as acroread.
In your FAQ you mention that this is impossible, but I managed to do it !!!
This solution is multiplatform

The general ideas is to use a PdfWriter that writes into a piped 
outputstream connected to the inputstream that feeds the Printer Doc.

public void printPDF(){
   createBook();
   BaseFont arial, courier, timesnewroman;
   try{
     PipedInputStream pdf_in = new PipedInputStream();
     PipedOutputStream pdf_out = new PipedOutputStream();
     DocFlavor myFlavor = DocFlavor.INPUT_STREAM.AUTOSENSE;
     pdf_in.connect(pdf_out);
     Doc d = new SimpleDoc(pdf_in,myFlavor,new HashDocAttributeSet());
     PDF_Thread pt = new PDF_Thread (pdf_out);
     pt.start();
     PrintService[] ps = 
PrintServiceLookup.lookupPrintServices(myFlavor, null);
     boolean bool = true;
     PrintService service = ServiceUI.printDialog(null, 100, 100, ps, 
ps[0],  myFlavor, null);
     DocPrintJob dpj = service.createPrintJob();
    dpj.print(d, pas);
   }catch(Exception e){e.printStackTrace(System.out);}
 }

 public class  PDF_Thread  extends Thread{
   public  PDF_Thread(OutputStream os){ this.os = os; }
   public void run(){
     try{
       Document document = new Document();
       PdfWriter writer = PdfWriter.getInstance(document, os);
       document.open();
       document.setPageCount(this.book.getNumberOfPages());
        document.newPage();
         PdfContentByte cb = writer.getDirectContent();
         PdfTemplate tp = cb.createTemplate(500,500);
         Graphics2D g2 = tp.createGraphics(500,500, mapper);
        g2.drawString("Hello World !!!",100,100);
         cb.addTemplate(tp, 0, -0);
         g2.dispose();
       document.close();
     }catch(Exception e){ e.printStackTrace(System.out);}
   }
 }

begin:vcard
fn;quoted-printable:=CE=99=CF=89=CE=AC=CE=BD=CE=BD=CE=B7=CF=82 =CE=9A=CE=B1=CE=BD=CE=AD=CE=BB=
	=CE=BB=CE=BF=CF=82
n;quoted-printable;quoted-printable:=CE=9A=CE=B1=CE=BD=CE=AD=CE=BB=CE=BB=CE=BF=CF=82;=CE=99=CF=89=CE=AC=CE=BD=CE=BD=CE=B7=CF=82
email;internet:i.canellos@alpha-inf.gr
tel;work:(30)2106144459
version:2.1
end:vcard