A Java geek

Faster Mutation Testing

As an ardent promoter of Mutation Testing, I sometimes get comments that it’s too slow to be of real use. This is always very funny as it also applies to Integration Testing, or GUI. Yet, this argument is only used againt Mutation Testing, though it cost nothing to setup, as opposed to the former. This will be the subject of another post. In this one, I will provide proposals on how to speed up mutation testing, or more precisely PIT, the Java Mutation Testing reference.

Development

Smart logging in Java 8 and Kotlin

Logging is a not a sexy subject but it’s important nonetheless. In the Java world, logging frameworks range from Log4J to SLF4J via Commons Logging and JDK logging (let’s exclude Log4J 2 for the time being). Though different in architecture and features, all of their API look the same. The logger has a method for each log level e.g.: debug(String message)info(String message)error(String message)etc. Levels are organized into a hierarchy.

Development

Encapsulation: I don't think it means what you think it means

My post about immutability provoked some stir and received plenty of comments, from the daunting to the interesting, both on reddit and here.

Development

Rolling dice in Kotlin

A little more than 2 years ago, I wrote a post on how you could create a Die rolling API in Scala. As I’m more and more interested in Kotlin, let’s do that in Kotlin. At the root of the hierarchy lies the Rollable interface

Java

Software labels translation is not so easy

Some developers have hardly ever touched software labels translation, some do it on a day-to-day basis. It sure helps to work in a country with more than one language – official or de facto. Even for in the first case, it’s considered good practice to externalize labels in properties files. As for the second case, languages are in general related. In Java, the whole label translation mechanism is handled through a hierarchy of properties files.

Java

Immutable data structures in Java

Before being software developers, we are people - and thus creatures of habits. It’s hard for someone to change one’s own habits, it’s harder for someone to change someone else’s habits - and for some of us, it’s even harder. This, week, during a code review, I stumbled upon this kind of structure.

Technical

GitLab, the overlooked Git solution in the cloud

When one thinks about hosting one’s Git repository online, one’s first choice is just Github, no questions asked. It’s so successful that it has become the de facto standard of Git solutions in the cloud. It’s so well-entrenched that developers are advised to use it as their portfolio. At first glance, Github has it all: public repositories, group collaboration, metrics, page hosting, on-premise install option, etc.

Development

Code improvements with Kotlin

This week, I tried to improve my pet Android application developed in Kotlin. As I was very new to Kotlin when I started it, most of the code just looks like Java written in Kotlin. I will start simply.

Development

Maze-walking algorithm

Last week, a colleague pointed out to my team an online developer recruitment challenge. As I find it fun and there was no need to disclose one’s email, I decided to try, just to check if I could to it. The problem is quite simple but not easy: consider a rectangular maze of finite size. One has to find a specific cell on the board - the exit, starting from the origin. One has 2 move options: one cell at a time in one of the 4 cardinal points or jumping to any previously visited cell.

Nicolas Fränkel's blog