Using SimpleDoc() with DocFlavour String (not InputStream)

When trying to use SimpleDoc I get this error:

Exception in thread "main" java.lang.IllegalArgumentException: data is not of declared type
at javax.print.SimpleDoc.<init>(Unknown Source)
at PrintPsString.main(PrintPsString.java:32)

No doubt because I am specifying a DocFlavour of INPUT_STREAM (DocFlavor.INPUT_STREAM.POSTSCRIPT) and supplying a String.

Unfortunately DocFlavor.STRING doesn't include a
DocFlavor.STRING.POSTSCRIPT and using
DocFlavor.STRING.TEXT_PLAIN I get no available printers

I can make it work if I assign a FileInputStream to a file containing the same data. What can I do to print data created dynamically in my program?

------------------------------8<------------------------------
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.HashPrintRequestAttributeSet;
import javax.print.attribute.PrintRequestAttributeSet;

public class PrintPsString {
public static void main(String[] args) {

// data to be printed
StringBuffer sb = new StringBuffer();
sb.append("%!PS\n");
sb.append("/Helvetica 24 selectfont\n");
sb.append("100 700 moveto\n");
sb.append("(Simple Postscript) show\n");
sb.append("showpage\n");

// select target printer
DocFlavor flavor = DocFlavor.INPUT_STREAM.POSTSCRIPT;
PrintRequestAttributeSet aset = new
HashPrintRequestAttributeSet();
PrintService[] pservices = PrintServiceLookup
.lookupPrintServices(flavor, aset);
if (pservices.length == 0) {
System.out.println("No suitable printers");
System.exit(0);
}
DocPrintJob pj = pservices[0].createPrintJob();
System.out.printf("Printing to '%s' \n",
pservices[0].getName());

// printable 'document'
String s = sb.toString();
Doc doc = new SimpleDoc(s, flavor, null);

// print it
try {
pj.print(doc, aset);
System.out.println("Your document has been Printed");
} catch (PrintException e) {
e.printStackTrace();
System.out.println(e.getMessage());
}

}
}
------------------------------8<------------------------------

.

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