If you are here because my plugin requires this api, just add the plugin to the plugins folder and if any configuration is required, it is written in my plugin.
SO FAR THE PLUGIN USES JAVA 8
FEATURES
A set of libraries enabling the use of advanced functions, e.g. communication between servers without a proxy server. This plugin is used for some of my (maybe not only) plugins, where more complex systems are required.
networking between servers without proxy server
sending packets (objects) to other servers without proxy server
receiving packets (objects) from other server
getting datas of player from database (inter-server OfflinePlayer)
libraries with methods from Bukkit 1.12+ in oldest version of spigot
color formatting (color character and hex)
All features and API usage is described in GITHUB WIKI. A detailed description is available on GITHUB.