This is a chat application. Implemented websocket in spring boot. Websocket produces full-duplex two way communication between client and server.
Client can send message to server and server broadcast message to all the clients subscribed to it. This is an example for group chat.
Complete code explanation is included in my article : https://helptechcommunity.wordpress.com/2020/01/28/websocket-chat-application-using-spring-boot-and-react-js/