I need to run a Shell script or program with Java's Runtime.exec()
method. The script works great, But the new problem is sometime, I have
to run the script as a different user from the one who started current
Java app.

I was trying to use "sudo" or "su -c" to run the script. But the
parameters cannot be passed over in Unix. So my question is anyway in
Java world that allow start a new process as different user?

Thanks