Server part for WebSocket application?

Question

Java

I want to write an android application (chat) using WebSocket. Server - I plan, either java or golang. You can throw good articles, or implementations in order to figure it out.
I also want to hear your advice on this matter and what is the best server to use to launch the play.

Answer 1

Spring Boot has very handy tools for creating WS servers using the STOMP protocol.
Links:
Quick guide
Detailed documentation

Answer 2

Here

Answer 3

I want to write an android application (chat) using WebSocket.

Bad business ;-)