Started migrating the mod over to using Jetty as the HTTP server instead of Java's implementation.
Got more of the web server ported to Jetty. It now starts and stops with the Minecraft server.
Downgraded to Jetty version 8 because it has an aggregate Jar that's significantly more convenient to use and the documentation is more complete for that version. The only documentation for version 9 is a draft.
Found that the class files were persisting for some reason. Fixed that.