JSR-356 comprises both: client and server endpoints.
This screencast demonstrates how to connect to a (Java EE 7) server from a plain Java client using the RI (tyrus):
Also checkout: hellsockets.
Cloudy Jakarta EE and MicroProfile: Microservices, Clouds and Beyond Jakarta EE / MicroProfile airhacks workshops at MUC airport, Winter Edition
airhacks.fm the podcast:
Stay in touch: airhacks.news.