Copy the full text of the console here.
What are you expecting to happen?
What you've typed above is very confusing.
How is the Jackpot.java file involved in your project?
If your create a batch file named cmdline.bat and then enter cmd.bat ??? Should you be entering: cmdline.bat instead?
Here's what I see on a console on XP:
C:\Temp>cmdline.bat
C:\Temp>cmd
Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.