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if the top of your JSP reads
<%@ page contentType="application/x-java-jnlp-file"%>
<?xml version="1.0" encoding="UTF-8"?>
How do you add html to this page?
Equally, How would you get the web browser to create a popup for instructions?
Why not write a regular servlet for it? JNLP files are not html and i dont even know how that would work with JSP.
And if you send a JNLP most web browsers will know what to do with it, you can also distribute this file through email(or other means) and start it directly on the users computer.
I used to have several WebStart apps a few years ago and i wrote a servlet that would just serve the JNLP file from the local file system. I later changed it to generate the JNLP file on the fly and include default libraries i used in all my projects. I also used that to serve the jars from the file system so they didnt need to be bundled with the servlet WAR.
I put some of my code here http://ideone.com/36sjB as a start. Most of it was used in an experimental in house app, so this should not be used in production code ;).
Sending the JNLP is just like sending the jar with a different content type. I also have code about generating the JNLP from scratch through the servlet if you are interested.