The goal of this project is to implement two Spring Boot applications: bitcoin-api and bitcoin-client. The bitcoin-api application simulates BTC price changes, while the bitcoin-client application listens to these changes and updates a real-time UI. The bitcoin-client UI is secured using Basic Authentication.

On ivangfr.github.io, I have compiled my Proof-of-Concepts (PoCs) and articles. You can easily search for the technology you are interested in by using the filter. Who knows, perhaps I have already implemented a PoC or written an article about what you are looking for.

• [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 simulates BTC price changes and pushes those changes to Kafka

• bitcoin-client

  Spring Boot Web Java application that was implemented using Thymeleaf as HTML template. It reads from Kafka and updates its UI using Websocket. 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 the springboot-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 the springboot-kafka-websocket root folder, run the following Maven 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 the BTC price changes. Additionally, they are using a chat channel to communicate with each other.

• Kafdrop

  Kafdrop can be accessed at http://localhost:9000

• MySQL

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

• To stop applications

  • If they were started with Maven, go to the terminals where they are running and press Ctrl+C;

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