Hey guys 
Im currently developing a little rpg duengon crawler.
I really want to implement a local and an online multiplayer function, i know how servers are working and how to make them using sockets or kryonet.
But heres my question, i want that when someone, starts a local server in my game, that it starts an runnable jar file which includes the server, is that recommend or just stupid ? Should the server be included in the game or outside in an extra file ? What should i obverse ?