Hi all. I just started with FML development. Im new in java and gradle, so please sorry me. I feel like i missing some basics, but i didnt found anything, that may help me. Im currently playing with my couple of my friends on local server and we wanna to do integration our game chat with third party software cloud for our purposes. So i started to write client side mod. This cloud uses Websockets and i have arleady implemented almost whole logic with two dependencies (gson and java-websockets ( details coming bellow ) ) Everything was normal, before i tried to test build on normally (obfusicated) game - i became crash with ClassNotFoundException: https://pastebin.com/aM9VEvnp And there my build.gradle: https://pastebin.com/VhqLTqGN As i have understood, my libralies like websocket (and maybe gson? ) arent included in final build and i cant find nothing. Is there any way to fix that without addoptional stuff, multiple jar files and so on? And why my classPath doesnt work in this case? Thanks!