The goal of this project is to implement twoSpring Boot applications:bitcoin-api andbitcoin-client. Thebitcoin-api application simulatesBTC price changes, while thebitcoin-client application listens to these changes and updates a real-time UI. Thebitcoin-client UI is secured using Basic Authentication.

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• [Medium]:Building a Web Chat with Social Login using Spring Boot: Introduction

• [Medium]:News Producer and Consumer Tutorial

• bitcoin-api

  Spring Boot Web Java application service that simulatesBTC price changes and pushes those changes toKafka

• bitcoin-client

  Spring Boot Web Java application that was implemented usingThymeleaf as HTML template. It reads fromKafka and updates its UI usingWebsocket. It has also a chat where users can talk to each other by sending messages publicly or privately.

• Java 21 or higher

• A containerization tool (e.g.,Docker,Podman, etc.)

• Open a terminal and inside thespringboot-kafka-websocket root folder run:

  docker compose up -d

• Wait for Docker containers to be up and running. To check it, run:

  docker ps -a

Inside thespringboot-kafka-websocket root folder, run the followingMaven commands in different terminals:

• bitcoin-api

  ./mvnw clean spring-boot:run --projects bitcoin-api -Dspring-boot.run.jvmArguments="-Dserver.port=9081"

• bitcoin-client

  ./mvnw clean spring-boot:run --projects bitcoin-client -Dspring-boot.run.jvmArguments="-Dserver.port=9082"

The gif below shows two users checking real-time theBTC price changes. Additionally, they are using a chat channel to communicate with each other.

• Kafdrop

  Kafdrop can be accessed athttp://localhost:9000

• MySQL

  docker exec -it -e MYSQL_PWD=secret mysql mysql -uroot --database bitcoindbselect * from prices;

• To stop applications

  • If they were started withMaven, go to the terminals where they are running and pressCtrl+C;

  • If they were started as Docker containers, go to a terminal and, inside thespringboot-kafka-websocket root folder, run the script below:

    ./stop-apps.sh

• To stop and remove docker compose containers, network and volumes, go to a terminal and, inside thespringboot-kafka-websocket root folder, run the following command:

  docker compose down -v

To remove the Docker images created by this project, go to a terminal and, inside thespringboot-kafka-websocket root folder, run the script below: