Guide to Quarkus with Kotlin

Quarkus is a lightweight Java framework developed by RedHat. It is dedicated for cloud-native applications that require a small memory footprint and a fast startup time. Its programming model is built on top of proven standards like Eclipse MicroProfile. Recently it is growing in popularity. It may be considered as an alternative to Spring Boot framework, especially if you are running your applications on Kubernetes or OpenShift.

An Advanced Guide to GraphQL with Spring Boot

In this guide I’m going to discuss some more advanced topics related to GraphQL and databases, like filtering or relationship fetching. Of course, before proceeding to the more advanced issues I will take a moment to describe the basics – something you can found in many other articles. If you already had the opportunity to familiarize yourself with the concept over GraphQL you may have some questions. Probably one of them is: “Ok. It’s nice. But what if I would like to use GraphQL in the real application that connects to database and provides API for more advanced queries?”. If that is your main question, my current article is definitely for you. If you are thinking about using GraphQL in your microservices architecture you may also refer to my previous article GraphQL – The Future of Microservices?.

Distributed Transactions in Microservices with Spring Boot

When I’m talking about microservices with other people they are often asking me about approach to distributed transactions. My advice is always the same – try to completely avoid distributed transactions in your microservices architecture. It is a very complex process with a lot of moving parts that can fail. That’s why it does not fit to the nature of microservices-based systems.

JPA Data Access with Micronaut Data

When I have writing some articles comparing Spring and Micronaut frameworks recently, I have taken a note of many comments about lack of built-in ORM and data repositories support in Micronaut. Spring provides this feature for a long time through Spring Data project. The good news is that the Micronaut team is close to complete work on first version of their project with ORM support. The project called Micronaut Predator (short for Precomputed Data Repositories) is still under active development, and currently we may access just the snapshot version. However, the authors are introducing it is as more efficient with reduced memory consumption than competitive solutions like Spring Data or Grails GORM. In short, this could be achieved thanks to Ahead of Time (AoT) compilation to pre-compute queries for repository interfaces that are then executed by a thin, lightweight runtime layer, and avoiding usage of reflection or runtime proxies.