How can i create one Launchwhere with exeucutable jar

I have to create one installer.
and we wanted to launchWhere for java application which should launh executable jar file like "java -jar execute.jar with folder1/myprrj-jetty.xml."

but during creating install its always asked for the main class.
requesting you please guide me on above issue how can i create launchwhere to execute the executable jar file.
and what should be my paramter for Main class and arguments.

Regards
KM