A Java geek

Event Streams in Action

Between 2009 and 2013, I published ten book reviews on this blog. And since then, nothing. Reading a book is a huge commitment, not to mention the review. During the lockdown, Manning approached me for a 'partnership opportunity'. In general, I turn down such offers. But I already bought and read books from Manning in the past: they range from above-average to good reads. I proposed to amend the deal like this: Manning sends a book of my choice for free and I write an honest review.

Java

(Finally) solving a substitution GraalVM issue

One of my current talks is about creating a Kubernetes operator in Java. I demo it step by step. In the later steps, I’m using GraalVM native image to create a native executable. In that regard, some libraries are not compatible with the native image creation process. Several options are available to make them work anyway. One of the options is to substitute incompatible code with compatible one. In the above post, I describe how to use those substitutions. I thought I had it right.

Java

Most commonly available JDKs

For reasons I dare not mention, I had to install version 7 of the JDK a couple of months ago. As a Mac user, my usual way of installing is using Homebrew. To install a JDK, this is as easy as brew cask install adoptopenjdkx, where x is the Java version. It didn’t work, as AdoptOpenJDK provides no version 7. It took me some time to find a JDK 7. In the end, I found one in Zulu - thanks to Azul.

Development

From Spring Boot to Quarkus

Last week, I migrated a sample Spring application to Micronaut. This week, I did the same for Quarkus. Spring Boot and Micronaut both offer a parent POM. Quarkus favors using a BOM.

Development

From Spring Boot to Micronaut

In the last couple of years, I’ve been playing a bit with a generation of tools in the Java world, namely Micronaut, Quarkus and GraalVM. While I’m a Spring Boot fan since its beginning, I believe this quite an eye-opening opportunity. In this post, I’d like to see how easy, or how hard, it is to port a simple Spring Boot application to Micronaut. Setting up the context The JVM is an great piece of technology.

Development

From Reactor to Coroutines

Last September, I wrote how to migrate from an Imperative Programming codebase to a Reactive Programming one in a step-by-step process. Because of its popularity, I illustrated the post with a Spring Boot demo. The final result uses Mono and Flux from Project Reactor. I also made sure that no step in the processing pipeline is blocking thanks to Blockhound. I wrote the code in Java so that it could be accessible to the largest audience. But I’m still a Kotlin fan at heart.

Java

Update on the state of Java modularization

At the beginning of 2019, I wrote about the state of Java modularization. I took a sample of widespread libraries, and for each of them, I checked whether: It supports the module system i.e. it provides an automatic module name in the manifestIt’s a full-fledged module i.e. it provides a module-info The results were interesting. 14 out of those 29 libraries supported the module system, while 2 were modules in their own right.

Miscellaneous

Do's and don'ts for conference organizers, a speaker's point-of-view

My job requires me to speak at conferences. Despite the current situation, this hasn’t changed much. At the time of this writing, I submitted 439 different proposals to 215 unique conferences in 2020. I already wrote some advice for junior conference speakers. As a follow-up, I’d like to offer my view on the organization of conferences, from my speaker’s point-of-view. While the online and the on-site experiences are quite different, most of my feedback applies to both.

Development

A Hitchhiker's Guide to Containerizing (Spring Boot) Java Apps

Containerizing an application based on a 'scripting' language is straightforward. Add the sources, download the dependencies, and you’re good to go. One could say they are WYSIWYR. With compiled languages in general, and Java in particular, things are a bit different. In this post, I’d like to list some alternatives to achieve that.

Nicolas Fränkel's blog