Now I'm trying to get ITEXT Chapter 9 Part 3
to be called from web page.
There are no errors in Hello.java.
I've installed Apache and
Java SE Runtime Environment.
Not sure how to get the Hello.java to
appear as a web page.
Do you know what a servlet is? A web application? Tomcat? If not, you're building a house starting from the rooftop. You should look for some tutorials about these topics, start from a very simple HelloWorld servlet, and *then*, when this is working fine, include iText and PDF file generation.
Unfortunately, this is 100% out of topic on this list, and I doubt you'll get any other answer than "Google is your friend".