Goals: 1) Create a simple Spring Boot application to manage users; 2) Explore the utilities and annotations that Spring Boot provides for testing; 3) Test using Testcontainers.

The goal of this project is to use Nginx as a reverse proxy and load balancer for a Keycloak cluster with two instances and a Spring Boot application, called simple-service, also with two instances…

The goal of this project is to secure movies-app using Keycloak (with PKCE). movies-app consists of two applications: one is a Spring Boot Rest API called movies-api and another is a React applicat…

On this website, 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 impl…

The goal of this project is to create a simple Spring Boot REST API, called simple-service, and secure it with Keycloak. Furthermore, the API users will be loaded into Keycloak from OpenLDAP server.

Experiment with Kafka, Debezium, and ksqlDB. research-service: Performs MySQL record manipulation. Source Connectors: Monitor MySQL changes, push messages to Kafka. Sink Connectors and kafka-resear…

Project goal: Explore Kafka, Kafka Connect, and Kafka Streams. Components: store-api: Inserts/updates MySQL records. Source Connectors: Monitor MySQL changes, push messages to Kafka. Sink Connector…

This project is a web tool that helps you see and interact with H3 hexagons on a map. You can add or remove hexagons, change their size, color, and transparency, add or remove markers, and save or …

The goal is to explore Axon. We will develop a food-ordering app comprising 3 Spring Boot applications: customer-service, restaurant-service, and food-ordering-service. These services are implement…

The goal of this project is to create a Spring Boot application called movies-app that allows users to log in using their LDAP pre-defined account LDAP Authentication and One-Time Token Login

The goal of this project is to create a simple Spring Boot REST API, named 'simple-service,' and secure it using the Spring Security LDAP module. Additionally, Testcontainers will be utilized for i…

The goals of this project are to: 1) Create a Spring Boot application that manages books, called book-service; 2) Use Keycloak as OpenID Connect provider; 3) Test using Testcontainers; 4) Explore t…

Keycloak-Clustered extends quay.io/keycloak/keycloak official Keycloak Docker image by adding JDBC_PING discovery protocol.

Goal: create a Spring Boot app called book-service accessible only through the Kong API gateway. In Kong, the kong-oidc plugin will be installed, enabling communication between Kong and Keycloak. T…

The goal of this project is to develop a straightforward Spring Boot REST API application, named simple-service, which utilizes Okta for authentication handling.

The goal of this project is to create a Spring Boot application called movies-app that allows users to log in using Username/Password Authentication and One-Time Token Login

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 …

The goal of this project is to implement two Spring Boot applications using gRPC: the server, called movie-grpc-server, and the shell client, named movie-grpc-client. The library movie-grpc-lib def…

The goal of this project is to implement an application called product-app. It consists of two Spring Boot services: product-api (backend) and product-ui (frontend). Data will be stored in Elastics…

Goal: create a Spring Boot application that handles users using Event Sourcing. So, whenever a user is created, updated, or deleted, an event informing this change is sent to Kafka. Also, we will i…

The goal of this project is to explore GraphQL. For it, we will implement two microservices: author-book-api and book-review-api.

The goal of this project is to implement two front-end React applications, author-book-ui and book-review-ui. They will consume the GraphQL endpoints of the two back-end (BE) applications present i…

The goal of this project is to explore the capabilities of Vault. To achieve this, we will develop applications that utilize Vault for storing and retrieving secrets. Vault dynamically generates cr…

The goal of this project is to play with HTTPS and enable it in Spring Boot applications. For it, we will implement a Spring Boot Rest API that will have its endpoints ready to accept and server ov…

The goal of this project is to use ProxySQL to load balance requests from a Spring-Boot application to MySQL Replication Master-Slave Cluster.

The goal of this project is to implement an application called movie-app to manage movies. For it, we will implement a back-end Spring Boot application called movie-api and a font-end React applica…

The goal of this project is to implement an application called order-app to manage orders. For it, we will implement a back-end Spring Boot application called order-api and a font-end React applica…

The goal of this project is to implement an application called book-app to manage books. For it, we will implement a back-end Spring Boot application called book-api and a font-end React applicatio…

The goal of this project is to study JPA Batch Processing (i.e, insert / update / delete a set of records in a single command) and JPA Locking.

The goal of this project is to study the JPA relationships: one-to-one, one-to-many / many-to-one, and many-to-many.