A Java geek

Experimental: Kotlin and mutation testing

Since about a year and a half, I do a lot of presentations on Mutation Testing. In those, my point is to show that Code Coverage’s only benefit is that it’s easy to compute but that it’s meaningless - hence Mutation Testing. Since some time, I’ve been interested in Kotlin, a language from JetBrains that runs on the JVM. It’s only natural that I wanted to check how Mutation Testing could be applied to the Kotlin language.

JavaEE

Feedback on customizing Vaadin HTML template

Last week, my post was about how you could customize the default Vaadin HTML template so you could add a lang attribute for example. I didn’t ask for feedback, but I got it anyway, so let’s use the occasion to analyze it. First, I must admit that my solution was not Vaadin-esque as I used AOP to get the job done. My friend Matti Tahvonen from the Vaadin team was kind enough to provide not only one but 2 alternatives to my proposal.

JavaEE

Customizing Vaadin HTML template

This week, I had an interesting question on 'How in Vaadin do you add a lang attribute to the html element?' While it’s quite easy to customize individual components on the page, the outer html tag is outside our control. In this article, I’ll describe a possible solution to this problem.

Development

Feedback on the Josephus problem

My last week article was about the solving the Josephus problem in Kotlin. For ease of comparison, here’s the version I wrote originally: class Soldier(val position: Int) { var state = State.Living lateinit var next: Soldier fun suicide() { state = State.Dead } fun isDead() = state == State.

Development

Solving the Josephus problem in Kotlin

I recently stumbled upon a post telling about the Josephus problem and trying to solve it in different scripting languages. For the sake of brevity, here’s the problem (taken from the referenced post): Flavius Josephus was a roman historian of Jewish origin. During the Jewish-Roman wars of the first century AD, he was in a cave with fellow soldiers, 40 men in all, surrounded by enemy Roman troops. They decided to commit suicide by standing in a ring and counting off each third man.

Miscellaneous

The sad state of developer interviews

Recruiting is a complex process, and recruiting developers even more so. In this post, I will focus solely on the interviewing part (and leave the rant about recruiters who are paid 1 year of the candidate’s salary to just match buzzwords for another time). I recently stumbled upon an article about interview questions, again, telling you about 'right' answers for such and such questions.

Java

Log management in Spring Boot

Logging is for sure not a glamorous subject, but it’s a critical one - at least for DevOps and Ops teams. While there are plenty of material on the Web describing how to change your ASCII banner, there is not much on how to efficiently manage the log output. By default, Spring Boot will output log on the console and not use any file at all. However, it’s possible to tell Spring Boot to log in an output file. At the simplest level, the path where Spring Boot will put the spring.

Java

Designing your own Spring Boot starter – part 2

In the last post, I tried to describe the internal working of Spring Boot starter. It’s now time to develop our own! As an example, we will use XStream, a no-fluff just-stuff XML/JSON (de)serializer offered by Thoughtworks. Readers who only use JAXB and Jackson are advised to have a look at XStream, it’s extremely efficient and its API is quite easy to use. As seen in our last post, the entry-point of a starter lies in the META-INF/spring.factories file.

Java

Designing your own Spring Boot starter - part 1

Since its release, Spring Boot has been a huge success: it boosts developers productivity with its convention over configuration philosophy. However, sometimes, it just feels too magical. I have always been an opponent of autowiring for this exact same reason. And when something doesn’t work, it’s hard to get back on track. This is the reason why I wanted to dig deeper into Spring Boot starter mechanism - to understand every nook and cranny.

Nicolas Fränkel's blog