Please include jnlp.jar and especially jnlp-servlet.jar in the hudson.war file
so that I and my customers can click on an artifact and run the current
application. jnlp-servlet is required so that $$codebase and $$name can refer
to our build server.

Please view: http://java.sun.com/j2se/1.4.2/docs/guide/jws/downloadservletguide.html

for more information