Envoking a void method

I want to envoke a method (from a javabean)from a .jsp page.

This is the header of the method:
public void read_ini_file(String[] args) throws IOException {

Envoking the method using <%ID.read_ini_file();%> doesn't work. What is the correct way?

Well, your method definition says that it requires a String parameter be passed to it and you are not passing one. The void is the return value.

This is fundamental Java. I would strongly suggest that you learn Java basics before trying to do JSP's. Visit Suns site and do some of the tutorials there. http://developer.java.sun.com/developer/onlineTraining/
I would start with "The Java Tutorial"