Printing Error - pstopdffilter/pstocupsraster failed with err number -31000

Hi All,

I'm hoping someone could assist me with this. After googling like crazy for a solution I thought I had to post here on the forums. I'm a new Mac user (only a few days now) so please bear with me. I will also post this on the Java Forums because I don't know if this is a problem with my code or with the Mac settings.

Setup

I've got a Java Applet running on the mac (written in Eclipse 64 bit) on a Mac with OS X 10.6.4 on. Also, Java 1.6.0_21 (both 32 bit and 64 bit) is installed on the machine. The printer installed is a ZPL Label Printer (Zebra Technologies ZTC GK420d).
If I use another application such as TextEdit to print, it works fine.

*Problem Description*

Whenever I try print from the Applet nothing comes from the printer, my code does not break or catch any exception at all but the printer queue gives the error: *pstopdffilter/pstocupsraster failed with err number -31000.*

Code

The code I use with this Java Applet works absolutely fine on Windows XP 32 bit (IE 7.0, Google Chrome and Firefox) as well as on Windows 7 64 bit (I.E 8.0, Google Chrome and Firefox) but never on the Mac. For any developers who might be able to help, the code is below:


import java.applet.Applet;
import javax.print.Doc;
import javax.print.DocFlavor;
import javax.print.DocPrintJob;
import javax.print.PrintException;
import javax.print.PrintService;
import javax.print.PrintServiceLookup;
import javax.print.SimpleDoc;
import javax.print.attribute.PrintServiceAttribute;
import javax.print.attribute.standard.PrinterName;
import javax.print.attribute.HashPrintRequestAttributeSet;
import javax.print.attribute.PrintRequestAttributeSet;
import javax.print.attribute.standard.Copies;

public class UKMJavaPrintApplet extends Applet
{

public void init()
{
System.out.println("Initialising UK Mail Java Printing Applet...");
}

public void start()
{
System.out.println("Starting UK Mail Java Printing Applet...");
PrintLabelZPL("^XA^FO100,40^BY3^B3,,30^FD123ABC^XZ","Zebra Technologies ZTC GK420d");
}

public void stop()
{
System.out.println("Stopping UK Mail Java Printing Applet...");
}

public void destroy()
{
System.out.println("Preparing unload of UK Mail Java Printing Applet...");
}

public int GetPrinterCount()
{
PrintService[] services = null;
int serviceLength = 0;

try
{
services = PrintServiceLookup.lookupPrintServices(null, null);

if(services != null && services.length > 0)
{
serviceLength = services.length;
}
}
catch(Exception z)
{
System.out.println("Failed to get printer count: " + z.getMessage());
z.printStackTrace();
}

return serviceLength;
}

public String GetPrinterName(int index)
{

String sPrinterName = null;
String printerName = "";
PrintService[] services = null;

try
{
services = PrintServiceLookup.lookupPrintServices(null, null);

for (int k=0; k < services.length; k++)
{
PrintServiceAttribute attr = services[k].getAttribute(PrinterName.class);
sPrinterName = ((PrinterName) attr).getValue();

if(index == k)
{
printerName = sPrinterName;
break;
}
}
}
catch(Exception r)
{
System.out.println("Failed to get printer name: " + r.getMessage());
r.printStackTrace();
}

return printerName;
}

public Boolean PrintLabelZPL(String zplString, String printerName)
{

String errStr = "";
Boolean boolSuccess = false;

try
{
if(printerName != null && printerName != "")
{
PrintService psZebra = null;
String sPrinterName = null;

PrintRequestAttributeSet pras = new HashPrintRequestAttributeSet();
pras.add(new Copies(1));

PrintService[] services = PrintServiceLookup.lookupPrintServices(null, null);

for (int i = 0; i < services.length; i++)
{

PrintServiceAttribute attr = services .getAttribute(PrinterName.class);
sPrinterName = ((PrinterName) attr).getValue();
if (printerName.equals(sPrinterName))
{
psZebra = services;
break;
}
}

if (psZebra != null)
{

DocPrintJob job = psZebra.createPrintJob();

byte[] by = zplString.getBytes();
DocFlavor flavor = DocFlavor.BYTE_ARRAY.AUTOSENSE;
Doc doc = new SimpleDoc(by, flavor, null);
System.out.println("Printing to: " + printerName);
job.print(doc, pras);
boolSuccess = true;
System.out.println("Printing Successful.");
}
else
{
errStr = "Zebra printer not found.";
System.out.println(errStr);
boolSuccess = false;
}
}
else
{
errStr = "No printer name was provided.";
System.out.println(errStr);
boolSuccess = false;
}

}
catch (PrintException e)
{
System.out.println("Print Failed with PrintException: " + e.getMessage());
boolSuccess = false;
e.printStackTrace();
}
catch (Exception f)
{
System.out.println("Print Failed: " + f.getMessage());
boolSuccess = false;
f.printStackTrace();
}

return boolSuccess;

}

}

Does anyone have any ideas on how I can resolve this and print to the ZPL printer from my Java Applet on the Mac?
Any help would be much appreciated.
Thanks!