Hi .... Have a good day. This is kaival . I want to resticte the person who known java well but he can't extract my java programe means never any body can extract my jre fine anyhow . it is possible if possible give me its detail i hava one idea on class loader have u any idea. one more question what is the meaning of "javac -encoding<encoding>" If u have any idea about it send me ASAP. Thank's a lots dear friend who send reply and who has try for that kaival india.