Retrieving Jar path in the HD from within the jar?

I have a small problem. I wrote a program which is packed in a jar file and this program is able to compile and run java files (Which I do by running javac and java processes) but the kind of files that this program compiles requires some other libraries inside the same package (In the jar file) so I am wondering how can I retrieve the jar path in the harddisk from within this jar because at the moment I ask the user where the program is and I think it is kind of ugly to ask the user where the program is from within the exact same program we are looking for.
Hope I made myself understandable.
Best Regards
NooK

Thanks for the answer. I mistakenlly ended writing a new thread (New to the forum)
but if you would kindly look here, I have other problem now which I have been working on for a whole day.
http://forum.java.sun.com/thread.jsp?thread=524717&forum=31&message=2514471
Best Regards
NooK

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