I want to print .ps file from java

Question

Hello
i want to print .ps file using javax.print api and this give following error
sun.print.PrintJobFlavorException: invalid flavor
and my code is as below
public PrintPS() {
          /* Construct the print request specification.
          * The print data is Postscript which will be
          * supplied as a stream. The media size
          * required is A4, and 2 copies are to be printed
          //DocFlavor flavor = DocFlavor.INPUT_STREAM.AUTOSENSE;
          DocFlavor flavor = DocFlavor.INPUT_STREAM.POSTSCRIPT;
          PrintRequestAttributeSet aset =
               new HashPrintRequestAttributeSet();
          aset.add(MediaSizeName.ISO_A4);
          aset.add(new Copies(2));
          aset.add(Sides.TWO_SIDED_LONG_EDGE);
          aset.add(Finishings.STAPLE);
          System.out.println("HI");
          /* locate a print service that can handle it */
          PrintService pservices =
               PrintServiceLookup.lookupDefaultPrintService();
          System.out.println("Hello "+pservices);
          DocFlavor[] flavors = pservices.getSupportedDocFlavors();
          for (int i = 0; i < flavors.length; i++) {
          System.out.println(flavors.getRepresentationClassName());
     /*     if (pservices.length > 0) {*/
               System.out.println("selected printer " + pservices.getName());
               /* create a print job for the chosen service */
               DocPrintJob pj = pservices.createPrintJob();
               try {
                    * Create a Doc object to hold the print data.
                    * Since the data is postscript located in a disk file,
                    * an input stream needs to be obtained
                    * BasicDoc is a useful implementation that will if requested
                    * close the stream when printing is completed.
                    FileInputStream fis = new FileInputStream("hexagon.ps");
                    Doc doc = new SimpleDoc(fis, flavor, null);
                    /* print the doc as specified */
                    pj.print(doc, aset);
                    * Do not explicitly call System.exit() when print returns.
                    * Printing can be asynchronous so may be executing in a
                    * separate thread.
                    * If you want to explicitly exit the VM, use a print job
                    * listener to be notified when it is safe to do so.
               } catch (IOException ie) {
                    System.err.println(ie);
               } catch (PrintException e) {
                    System.err.println(e);
plz help me

Answer 1

1. Turn the router, iPad and printer off.
2. Turn on the router and then wait 30 seconds to let it complete its start-up process.
3. Turn on printer and then wait 30 seconds to let it complete its start-up process.
4. Turn on your iPad and test print.