Context Creating automatic unit tests is one of the most common tasks today in development day by day, but to create an effective unit test you should cover some specific aspects of testing. In this article, I will show you some of these aspects. First things first Let’s define a common scenario of business…

Context Oracle Cloud Infrastructure (OCI) has an always-free plan (here), where you have access FREE and FOREVER to some computing resources. Among them, you will have access to: Two AMD Compute VMs (1/8 Core and 1 Gigabyte of RAM) Up to 4 instances of Arm Ampere A1 Compute (4 cores and…

TL;DR Keycloak by default doesn’t supply a mapper to adding ‘external API call’ attributes to the JWT token, in this article I will show how to create a custom Mapper using Keycloak libraries and use this Mapper to add new attributes to the JWT token, using REST API. Context In one of…

Context When we are using MQTT for IoT communication it’s recommended to use TLS over the connections. TLS has two primary purposes: encrypting connection traffic and providing a way to verify that the peer can be trusted In my case I use the RabbitMQ with the MQTT plugin enabled to support…

Context The idea of this post began when a junior developer friend come to me and ask: “Hey Faita, what would you suggest to me (a junior developer) focus my studies?” Also, I completed ten years of a career in the development area, and I started thinking about what I would…

Context A time ago I wrote an article about how to use Quartz with Spring in clustered mode, but because of the active-passive cluster mode of Quartz, where only one node(containers, VM, put your type of infrastructure here) is responsible for handling the incoming “wake-ups” signals of Quartz, we had performance…

Stop creating new systems, try the tuning approach first — Context Let’s recreate a common scenario. My friend told me: another day in the company, everyone is called to an emergency meet and the following dialog begin: Guys, our system again is showing problems of performance and we just decided. We need a new implementation of the whole system. We already…

Context Creating automatic unit tests is one of the most common tasks today in development day by day, but to create an effective unit test you should cover some specific aspects of testing. In this article, I will show you some of these aspects. First things first Let’s define a common scenario of business…

Context Some time ago, a friend came to me and asked a question: “How could I create an architecture for a GPS Game, as Pokémon GO?”. At that moment, I started to think about millions of aspects, and my mind was blown. But when I calmed down, I started to think…