I watched today as someone painlessly exported a NetBeans java project to a JNLP file and HTML file that he could just copy to his web server. I, for whatever reason, have found making JNLPs someone challenging, and would love if I could do the same in Eclipse, but I can't seem to find such a function or a plugin which does this.

The only thing I've found is this article but I can't really parse it, it's a bit dense to me, for instance it mentions:

Ensure that the org.eclipse.equinox.launcher plug-in is in the feature or in one of the included feature;

But if that's even a grammatical sentence, I don't know how to ensure what it says.