i presume when u said u run da jar file meaning u double click da jar file n it gives da "Could Not Find Main Class" message?
have u made the manifest file (.mf) and packed it together inside da jar with the rest of ur .class files?
Da manifest file are used to tell the computer what .class should be used when u click da .jar file, .jar dun really work like .exe files, maybe thats da problem
