I'm going to develop a little Android game with multiplayer feature. I've made a server framework in C++ using eNet library and I would like to use this framework for make the server.
So, there is any networking library like eNet compatible with Java and C++? I know that exist jEnet (but is very out of date Java-enet-wrapper (https://github.com/csm/java-enet-wrapper), it's immature.
You might try out UDT: http://udt.sourceforge.net/
I have used it before with good success to communicate between Java and C++ processes.