In 2010 I spoke at a new conference that Sergi Almar was organizing in Madrid about Spring. At that time it was mostly focused on Spanish attendees, and quite small. Over the years the conference grew larger and larger, moved to Barcelona and became the biggest community-driven Spring conference in Europe, and probably the world, […]
Top take-aways from TEQNation
Last week, on May 15, I had the pleasure of attending the TEQNation conference. While I had been to this NLJUG event before, it felt like my first time again. Not only because of the amazing new location—the industrial chic De Fabrique—also because it’s my first time attending as a budding programmer. Although, given the […]
Unit Testing Source Code: Verifying Axon Event Upcaster Consistency
In our last project we used a JUnit test to check consistency of all code concerned with Axon event upcasting. We think this is interesting as we basically unit test source code rather than class behavior. In this blog we describe how we implemented it and conclude with a short evaluation and we list alternative […]
Distributed Tracing in an Axon Application
The Giftcard-demo demonstrates Axon Commands, Events and Queries either together or in a distributed fashion. Now with the tracing extension, these messages and context information can be visualised to get insight into the application behaviour. Requirements to run the demo You will need git, docker and maven. We will checkout out the code, build the […]
Spring Framework: Becoming the source of modern Java
A retrospect with Trifork’s CTO of Enterprise Application Development Joris Kuipers It may be surprising to realise that it’s been 16 years since the Spring Framework was first released. From its beginnings as an inversion of control container shared with a tight-knit community, Spring has evolved to a fully-fledged ecosystem of its own. No longer […]
Retry functionality in a reactive programming context
Reactive programming can be used to solve a lot of different use cases. Forinstance, reactive programming can be really helpful for cases where timing is an issue. An example of such a case is retry logic with delay or backoff functionality. Let’s have a look at some different implementations using Project Reactor (https://projectreactor.io) for Java. […]
Leaving a Java legacy behind
As with a house, software applications require maintenance too. Otherwise, you risk the digital equivalent of rot: bit-rot. Often, the maintenance is done like with a house: Superficially to make it look nice again with a new look-and-feel, a new colour scheme (a paint job) and a few new stock photos. But every once in a […]
3 reasons why your Big Bang legacy replacement will most likely fail miserably!
This morning I was listening to the radio and first, there was an item about a large government organization that had spent 4 years and a boatload of money on a Big Bang legacy replacement. The project was canceled and had been a complete waste of time, energy and money. Right after this item, there […]
Centralized metrics with Stackdriver Prometheus Exporter
Google does not currently charge for monitoring data when it comes to GCP metrics. Therefore, if you want to monitor operations of Google Cloud Platform (GCP) services, such as: Compute Engine, Cloud SQL, Cloud Dataflow and Cloud Pub/Sub, using Google’s Cloud Monitoring service – Stackdriver – is a perfect choice…
CQRS replay performance tuning
We, as experienced users and consultants for Axon, encourage developers that work with Axon Framework or are considering working with it, to read the following blog by Frans van Buul from AxonIQ. This blog explains in a clear and structured way, how to avoid the pitfalls that can happen when replaying past events after changing/adding read models. […]