Author Archives: Felix Leipold

Iron Law of Responsibility

Posted on 3. September 2021 by Felix Leipold

Apparently formulated by Keith Davis and Robert Blomstrom (1971): “In the long run, those who do not use power in a manner that society considers responsible will tend to lose it.” The concept is interesting and predates what you can … Continue reading →

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Introducing JLauncher

Posted on 1. October 2020 by Felix Leipold

The JVM has become a standard execution environment for a lot of server code. It’s no longer only Java, but also languages such as Scala, Kotlin and Clojure that target the JVM. However, for creating everyday command line tools I … Continue reading →

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Brexit Means Brexit

Posted on 28. July 2017 by Felix Leipold
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New jproc Release

Posted on 15. August 2016 by Felix Leipold

I have just released version 2.2.0 of jproc, a handy library to run external programs from Java. It is nice to use a serious programming language (whichever JVM language you consider serious) rather than just bash, if things get a … Continue reading →

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Wrapping Exceptions with Context

Posted on 21. January 2016 by Felix Leipold

A good error / exception message should provide enough information to pinpoint a problem. In most modern languages there is a stack trace feature that will show how the program got to the point where it broke. Unfortunately this information … Continue reading →

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Shades of Green – The Release Candidate Report

Posted on 27. August 2015 by Felix Leipold

On our current project we practise continuous integration and we perform weekly releases. To simplify the decision whether a particular build is fit for production we introduced a release candidate report that contains all the information that we usually take … Continue reading →

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Dealing with Flaky Tests using Data

Posted on 12. May 2015 by Felix Leipold

I recently wrote a sbt plugin that produces tabular test reports. My motivation was to get better insights into the reliability of our test suite. Due to good discipline most failures that occur are caused by flakiness of tests that … Continue reading →

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Managing Configuration

Posted on 5. December 2014 by Felix Leipold

The Problem In almost every serious software development effort that entails integrating different systems multiple environments are being used throughout development, testing and the production use of the system. Each of these environments typically contains a number of systems, that … Continue reading →

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Go Defrustrator

Posted on 16. May 2013 by Felix Leipold

At programmiersportgruppe I blogged about the go-defrustrator, a userscript that dynamically improves Go’s user interface.

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Sad Truth

Posted on 28. May 2012 by Felix Leipold

This Saturday I made a rather chilling discovery. Most people in my generation know the ingenious prankster Emil i Lönnerberga. And – as the wikipedia article states – we were lead to believe that he grew up to be a … Continue reading →

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