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?

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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());
        }

    }
}
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