Posts by Jacob van Lingen

Let's make a curry

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Jacob van Lingen

One of the first topics you will encounter when studying functional programming will probably be currying. For an imperative programmer not used to mathematical notations, chances are you will find the concept hard to grasp. Then let this be the day you will remember as the day you completely understood currying!

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Oh, those bits and bytes

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Jacob van Lingen

The time is right. Your work is done. The last letter of your Java code has been written. You let the IDE compile the code and a new running version of your app is ready to be released. You’ve done this a thousands times, there’s nothing new on the horizon. The question what lies beneath, what happens under the hood, has never occurred to you. Until now!

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Expanding the Java Bean Validations

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Jacob van Lingen

Since beginning of time mankind has been looking for a way to separate right from wrong. Where the primeval man judged righteousness by the contributions of the tribe, the current day programmer judges right by the wishes of the customer. For many years the average programmer wrote a bunch of logic to check if the boundaries defined by the client where uphold. As time went on and programming languages involved, metadata could be added to enrich functions, methods, classes and the like.

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Visualizing a nasty virus

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Jacob van Lingen

At the time of writing the coronavirus is raging the earth. Very soon after the outbreak, visualizations of both the virus and the effect of the disease started to appear everywhere. As I partially graduated in the subject of data visualization, I have always been interested in those graphs. Lately, I followed an introduction course to visualize data with D3.js. After I completed this course, I wanted to draw some meaningful graphics with this library. So follow along when I explain a little bit about D3 and then draw a simplified version of the coronavirus molecule.

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Don't be afraid of Docker

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Jacob van Lingen

As a developer, you are familiar with Docker. You push your images to the Hub, use Compose locally and know a thing or two about Kubernetes. Or…​ Well…​ To be honest…​ You don’t. And you are ashamed you don’t know anything about it. You browse the internet and it’s so overwhelming. So you stop looking and continue what you’ve been doing all the time. Deep inside, you still wonder. Can’t anyone not just explain Docker in simple terms? Is it really this hard? Or am I just missing something really obvious?

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How to fix a drop of code coverage with a multi module Maven project

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Jacob van Lingen

Adding code coverage to SonarQube is quite easy for any Maven project nowadays. Just add the jacoco-maven-plugin dependency to your pom.xml, add the prepare-agent execution task, and you are good to go. Even for multiple modules this works out of the box. But time goes on and your application grows as well. You start moving code to other modules, and somehow SonarQube no longer seems to pick up the covered code. What the heck is going on?

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