Convert from a pdf byte[] to Postscript using Java

Question

I am looking into creating PostScript file from a pdf as byte[], to send to printer.

I've checked this post and the reply from Dustin seem to be somewhat similar to what I need. Convert from PDF to Postscript using Java

What I got however is a byte[] that will output a pdf from FileOutputStream. But I want to convert to PostScript. I can't get this code referenced to work, can anybody advise?

import java.io.File;
import java.io.FileOutputStream;
import javax.print.DocFlavor;
import javax.print.DocPrintJob;
import javax.print.SimpleDoc;
import javax.print.StreamPrintService;
import javax.print.StreamPrintServiceFactory;
import javax.print.attribute.HashPrintRequestAttributeSet;
import javax.print.attribute.PrintRequestAttributeSet;

import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.printing.PDFPrintable;
import org.apache.pdfbox.printing.Scaling;

public class Printing {


        public static void main(String[] args) {
            try {
            DocFlavor flavor = DocFlavor.SERVICE_FORMATTED.PRINTABLE;
            String psMimeType = DocFlavor.BYTE_ARRAY.POSTSCRIPT.getMimeType();
            StreamPrintServiceFactory[] factories = StreamPrintServiceFactory.lookupStreamPrintServiceFactories(flavor, psMimeType);

            System.out.println ("Available PS services: " + factories.length);
            System.out.println ("Format: " + factories[0].getOutputFormat());

            FileOutputStream outStream = new FileOutputStream("/path/to/your.ps");
            StreamPrintService printService = factories[0].getPrintService(outStream);


            PrintRequestAttributeSet aset = new HashPrintRequestAttributeSet();
            aset.add(MediaSizeName.NA_LETTER);              

            PDDocument doc = PDDocument.load(new File("/path/to/my.pdf"));

            SimpleDoc pdfDoc = new SimpleDoc(new PDFPrintable(doc, Scaling.SCALE_TO_FIT, false), flavor, null);

            DocPrintJob newJob = printService.createPrintJob();
            newJob.print(pdfDoc, aset);

            outStream.close();

            }
            catch(Exception ex) {
                ex.printStackTrace();
            }
        }
}