Error printing String via Java Print Services (Java in General forum at Coderanch)

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Hey Ranchers!

I'm trying to send a simple String to the printer and it's not playing nice. My test program runs without error, but when I run "lpstat -t"
and check the printer's status...

printer Infoserv now printing Infoserv-0. enabled since Thu 16 May 2013 01:25:40 PM EDT
This document does not conform to the Adobe Document Structuring Conventions and may not print correctly!

Nothing prints and the job hangs in the queue.

I Googled "Adobe Document Structuring Conventions" to no avail. :-(

Here is my program.

import java.util.*;
import javax.print.*;
import javax.print.attribute.*;
import javax.print.attribute.standard.*;
public class TestPrinter
    public void print()
        throws Exception
            String address =
                "Bill Clar\n" +
                "123 Main St\n" +
                "Sanford, FL 32771";
            DocFlavor flavor = DocFlavor.STRING.TEXT_PLAIN;
            // Printer Attributes
            PrintRequestAttributeSet pratt = new HashPrintRequestAttributeSet();
            pratt.add(new Copies(1));
            // Lookup the Printer Service
            PrintServiceAttributeSet psatt = new HashPrintServiceAttributeSet();
            psatt.add(new PrinterName("Infoserv", null));
            PrintService[] services = PrintServiceLookup.lookupPrintServices(flavor, psatt);
            // Print Job
            if( services != null && services.length > 0 )
                System.out.println("Printer found:");
                for( int i = 0; i < services.length; i++ )
                    System.out.println("   " + services[i].getName());
                Doc doc = new SimpleDoc(address, flavor, null);
                DocPrintJob pj = services[0].createPrintJob();
                pj.print(doc, pratt);
                System.out.println("      Printer not found!");
                services = PrintServiceLookup.lookupPrintServices(null, null);
                for( int i = 0; i < services.length; i++ )
                    System.out.println("   " + services[i].getName());
        catch( Exception ex )
            throw new Exception("print() error: " + ex);
    public static void main(String args[])
            TestPrinter e = new TestPrinter();
            e.print();
        catch( Exception ex )
            ex.printStackTrace();
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