How *easy* to make a WebSocket client in Java?

Question

Java

Good afternoon.
There is a certain web server with which my java application needs to "talk" via the WebSocket protocol. To my surprise, I did not find a simple way (I did not find any). I do not want to write the implementation myself, although it is simple.
I would like a solution as simple as possible:

new URL("ws://echo.websocket.org").openConnection()

I also don’t want to install frameworks, giant libraries.
Advise, please, something simple.

Answer 1

And using the standard javax.websocket API isn't that easy?
Here is an example.