GraphQL with Kotlin + Spring Boot

Our frontend team at Bringmeister uses GraphQL as one of their major tools when build our online shop. They’re using it to query different APIs and repositories to collect and gather all of their data. Recently, they showed me a Kotlin library for GraphQL from Netflix: https://netflix.github.io/dgs Since they have been so enthusiastic about GraphQL […]

DynamoDB with Kotlin and Spring Boot (Part 2)

About a month ago I published a short article about Kotlin, Spring Boot and DynamoDB. The post shows a basic setup for DynamoDB with Kotlin and Spring Boot. However, it doesn’t show a lot of aspects related to typical database implementations such as auditing or migrations. To fill this gap, I prepared an example project […]

DynamoDB with Kotlin and Spring Boot (Part 1)

During the last week I implemented my first persistence layer with DynamoDB using Spring Boot and Kotlin. As I stumbled over a couple of obstacles, I decided to summarize what I did and how my final implementation looked like. Dependencies The dependencies are pretty straight forward. I decided to use Spring Data for DynamoDB and […]

Event Sourcing with Kotlin

Some weeks ago I published a demo project on GitHub showing a Domain Driven Design with Kotlin. You can find the original blog post right here. Now I took the approach one step further and added Event Sourcing to the demo. Here’s what I did. Event Sourcing The basic idea of Event Sourcing is to […]

Don’t depend on details – an example

I recently read Clean Architecture by Robert C. Martin. The book gives a simple advice: don’t depend on details! For Uncle Bob details are things like the database or message broker. Your architecture shouldn’t depend on the actual used implementation of those details. Whether your are using Oracle, MySQL or DynamoDB, whether it’s ActiveMQ, Kinesis […]

Object updater pattern in Kotlin

Updating data is one of the most frequent use-cases in applications. But it might also be a painful task which results in a bunch of ugly code. I recently stumbled over a typical update scenario in a Domain-Driven-Design (DDD) application. In the following, I want to show an elegant solution implemented in Kotlin (a Java […]

DDD with Kotlin

I recently made my first steps with Kotlin. After exploring the language for a couple of weeks, I tried to translate one of my favorite architectural patterns from my Java background to the Kotlin world – Domain Driven Design. Example project I’ve prepared an example project on GitHub showing some of the most important concepts […]