Visit https://nulpointerexception.com/2019/05/14/a-tutorial-on-implementing-a-chat-application-like-whatsapp-using-websocket-and-spring/ for complete guide.
Run it using: mvn package java -jar target/npe-chatroom-0.0.1-SNAPSHOT.jar
enhsuld/npe-chatroom
A Tutorial on Implementing a Chat Application like Whatsapp using WebSocket and Spring
Java