As it seems to me Jini is no longer available and it is moved to Apache River. There is poor documentation, and I wonder if there are some tutorials or other documentation for starting with Apache River.
Apache River documentation
1.8k Views Asked by Иван Бишевац At
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River docs can be found in the release. Jan Newmarch's book is the best for beginners. The older books are Jini 1.0 based, useful for some insights once you've gained some experience, but obsolete, requiring you to use and extend RMI classes. Jeri replaced RMI and is far more featured and flexible, exporting remote objects is now performed explicitly,rather than implicitly as with RMI.
The River page has a Getting Started section that should help get you going.
Also Jan Newmarch's page is a wealth of knowledge though it refers to the old Jini.org build but most everything is still the same as what his page says.