WebSockets come with Java EE 7 and require no additional dependencies or libraries. Particularly in "microservices architectures" websockets are an interesting option for the implementation of WAR to WAR communication.
In this screencast I created two WARs from scratch and let them communicate via WebSockets:
Cloudy Jakarta EE and MicroProfile: Microservices, Clouds and Beyond Jakarta EE / MicroProfile airhacks workshops at MUC airport, Winter Edition
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