[fedora-java] What is "definitive" Fedora Java packaging guide

[Edmon Begoli]

Could you please point me to "definitive" guide for creating Java RPMs.

I saw guides on using JPackage and some pretty good guides by
individuals outside of Fedora project,
but I would like to follow what is considered an official Fedora java
packaging guide or at least what is endorsed
by this group.

Thank you in advance,
Edmon