Scanner Java Class

Hi,
I have a Java JDK 1.6.0.13 on Windows XP and on Ubuntu 9.04, but a program that use a Scanner Java Class run correct on Windows XP and do not run correct on Ubuntu.

Above i wrote the program and the error. Can you help me ?

Thanks,

Jorge Elias

My program:
import java.util.Scanner;

public class InvoiceApp
{
 public static void main (String[] args)
 {
  Scanner sc = new Scanner (System.in); // create a new instance of Scanner class
  double subtotal, discountPercent, discountAmount, invoiceTotal;
  String message;

  // display a welcome message
  System.out.println ("Welcome to the Invoice Total Calculator");
  System.out.println ();

  // get the input from the user
  System.out.println ("Enter subtotal: ");
  subtotal = sc.nextDouble ();

  // calculate the discount amont and total
  discountPercent = .2;
  discountAmount = subtotal * discountPercent;
  invoiceTotal = subtotal - discountAmount;

  // format and display the result
  message = "Discount percent: " + discountPercent + "\n" +
          "Discount amount : " + discountAmount + "\n" +
     "Invoice total : " + invoiceTotal + "\n";
  System.out.println (message);
 }
}

The error:
>javac InvoiceApp.java
>Exit code: 0
>java InvoiceApp
Welcome to the Invoice Total Calculator

Enter subtotal:
Exception in thread "main" java.util.NoSuchElementException
 at java.util.Scanner.throwFor(Scanner.java:838)
 at java.util.Scanner.next(Scanner.java:1461)
 at java.util.Scanner.nextDouble(Scanner.java:2387)
 at InvoiceApp.main(InvoiceApp.java:17)
>Exit code: 1