A Java geek

Backpressure in Reactive Systems

Mid-January, I held a talk at Kotlin.amsterdam based on my post Migrating from Imperative to Reactive (a Spring Boot application). Because it was a Kotlin meetup, I demoed Kotlin code, and I added a step by migrating the codebase to coroutines. During Q&A, somebody asked whether coroutines implemented backpressure. I admit I was not sure of the answer, so I did a bit of research.

Technical

Goodbye minikube

I’ve been using minikube as my local cluster since I started to learn Kubernetes. But I’ve decided to let it go in favor of kind. Here’s the story. A couple of weeks ago, I gave my talk on Zero Downtime on Kubernetes. A demo is included in the talk, as with most of my presentations. While rehearsing in the morning, the demo worked, albeit slowly. Two days before that, I had another demo that also uses Kubernetes and it was already slow. But I didn’t take the hint.

Java

Monitoring across frameworks

Gone are the times when developers' jobs ended with the release of the application. Nowadays, developers care more and more about the operational side of IT: perhaps they operate applications themselves, but more probably, their organization fosters increased collaboration between Dev and Ops. I started to become interested in the Ops side of software when I was still a consultant. When Spring Boot released the Actuator, I became excited.

Java

Optional.stream()

This week, I learned about a nifty 'new' feature of Optional that I want to share in this post. It’s available since Java 9, so its novelty is relative. Let’s start with the following sequence to compute the total price of an order: public BigDecimal getOrderPrice(Long orderId) { List<OrderLine> lines = orderRepository.findByOrderId(orderId); BigDecimal price = BigDecimal.ZERO; (1) for (OrderLine line : lines) { price = price.add(line.

Development

Distribution of JVM desktop applications

This is the 6th post in the The state of JVM desktop frameworks focus series.

Development

The state of JVM desktop frameworks: Jetpack Compose for Desktop

This is the 5th post in the The state of JVM desktop frameworks focus series. The previous posts of this series were dedicated to frameworks that were pretty similar to each other. This week’s post is dedicated to Jet Compose for Desktop, the new kid on the block that offers an original approach.

Development

The state of JVM desktop frameworks: TornadoFX

This is the 4th post in the The state of JVM desktop frameworks focus series. The two previous posts of this series were respectively dedicated to Swing and SWT. This post is dedicated to Tornado FX, which itself is built on JavaFX.

Development

The state of JVM desktop frameworks: SWT

This is the 3rd post in the The state of JVM desktop frameworks focus series. This series is dedicated to the state of JVM desktop frameworks. After having had a look at Swing the previous week, this post focuses on the Standard Widget Toolkit. SWT originates from the Eclipse project, an IDE. For Eclipse, the developers built a dedicated framework to build their graphic components upon. Swing implements the drawing of widgets in Java from scratch.

Development

The state of JVM desktop frameworks: Swing

This is the 2nd post in the The state of JVM desktop frameworks focus series. In the first post of this series, we went through the rise and fall of some of the desktop frameworks, mainly Java ones. This post and the following will each focus on a single JVM framework. To compare between them, a baseline is in order. Thus, we will develop the same application using different frameworks.

Nicolas Fränkel's blog