A Java geek

Cherry-pick automation with Bash

I manage my Jekyll blog in a Git repo. My publication process uses 2 branches: master contains all production content, and feature/newposts has the new blog posts, ready to get published, one commit per post. To publish an existing post: I check the to-be-published post in the feature/newposts branch. Then, get the associated commit. And cherry pick it in the master branch. Finally, I push.

Programming

Default Git options

I started working with Git some years ago, and to be honest, it was not easy to pick up. It’s a huge beast, and there are several ways that can help to tame it. On the web, most articles focus on creating command shortcuts. In general, this goes like: instead of writing git pull --rebase, let’s create a shortcut to type gpr.

Development

From Imperative to Functional Programming: the Dijkstra algorithm

This is the 4th post in the From Imperative to Functional Programming focus series. This week, I’ll first implement the Dijkstra algorithm, then migrate the code to a more functional-friendly design. Dijkstra’s algorithm allows to find the shortest path in any graph, weighted or not, directed or not. The only requirement is that weights must be positive.

Development

Layering your Docker images with dependencies

Since already some years, this site uses the Jekyll static site generator. Generating the complete site takes about 15 minutes. Some time ago, I decided to setup Gulp to minimize HTML in order to speed up page view for readers. This change added about 10 minutes to the build time, for a total of ~25 minutes, which is a long time… too long. I wanted to decrease the build time, so I decided to play around. The initial state A Docker image is used to build the site.

Development

Creating Git shortcuts

There are two main use-cases for creating Git shortcuts: the command is used very often, and the shortcut will save a few keystrokes every type, and the command is used very seldom, and it’s hard to remember all correct options.

Kotlin

A comparison of assertion libraries

I was not a fan of assertions libraries at first. Whether assertions provided by the testing frameworks were enough is debatable. But those libraries provides the way to write custom assertions closer to the business language. While the intention is commendable, I always thought this path was a slippery slope. If one starts writing such custom assertions, then they need to be tested obviously. And then, when will it stop?

Java

Deduplication trick in legacy code

It might happen that you need to deduplicate a list of items… coming from legacy code. The class - let’s call it LegacyObject has already implementations for equals() and hashCode(). It’s not possible to change the implementation, for fear of breaking the running code. And unfortunately, the Java API doesn’t offer a distinctBy() feature.

Development

Options for managing derived attributes in Kotlin

A derived attribute is an attribute computed from other attributes e.g.: The fullName is aggregated from the first, middle and last nameThe age is computed from the birthdateetc. Kotlin offers different options to manage such derived attributes. Let’s browse through them.

Java

Spring DevTools with Jib and IntelliJ IDEA

I’ve been recently developing a Spring Boot application, and to speed up my development speed, I added Developer Tools as a dependency. By default, classes loaded in the HotSpot JVM can be updated only if the later runs in debug mode, and only for changes regarding method implementation. This means adding an attribute to an class requires a full restart. DevTools is an improvement over that.

A Java geek

Nicolas Fränkel's blog