It's not CI, it's just CI Theatre

Posted on Fri 26 May 2017 in General Software Development • Tagged with continuous integration, Suzie Prince, ThoughtWorks

Are you practising CI? Find out by reading this post by Suzie Prince.

The Initializer Pattern in Java

Posted on Sat 18 March 2017 in Design Patterns • Tagged with builder pattern, Heinz Kabutz, initializer, Java

A "type-safe builder pattern in Java".

The Lean Inception

Posted on Thu 16 March 2017 in General Software Development • Tagged with lean inception, Martin Fowler, MVP, Paulo Caroli

I should probably read this series of articles by Paulo Caroli before I try to convince my boss why implementing an MVP is a good idea.


Posted on Thu 09 March 2017 in Sysadmin • Tagged with boinc, headless, PiBakery, raspberry pi, tor, VNC

A great way to configure a Raspberry Pi from scratch is PiBakery. After struggling a while with setting up a VNC server and some other things on a fresh Pi connected only via Ethernet (no display, keyboard, or mouse), finding PiBakery was very helpful.

Here's my configuration:

PiBakery configuration

The long string …

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Using your SSL certificate for your Spark web application

Posted on Thu 09 March 2017 in Web Development, Sysadmin • Tagged with encryption, Java, Java keystore, let's encrypt, Spark, SSL

I've fallen in love with Spark recently. Being unexperienced with web development, I stumbled upon Spark when I was looking for a small framework for setting up a simple web application based on Java. My learning curve has been steep and my first website (consisting of nothing but a simple …

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Referencing a Bean in JasperReports

Posted on Sat 10 September 2016 in General Software Development • Tagged with Bean, jasperreports, stack overflow

Thanks to this answer on StackOverflow, I know how easy it is to reference the bean itself instead of one of its properties in a text field expression in JasperReports. The trick is to declare a field whose description is set to the keyword _THIS:

<field name="myBean" class="de …

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Installing a Tor Relay from Source on a Raspberry Pi

Posted on Sat 03 September 2016 in Uncategorized • Tagged with git, raspberry pi, stack overflow, tor

The other day I learned on Twitter that I should update the Tor relay software on my Raspberry Pi as the Tor project had introduced a new Bridge Authority. So I lazily ran sudo apt-get update  followed by sudo apt-get upgrade only to notice that no new version of the …

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Regex for German Zip Codes

Posted on Tue 05 July 2016 in General Software Development • Tagged with regex, zip code

I found the following regular expression (source) working fine for me:


I tried two alternatives that did not work because they were too general:



The first regex matches the …

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Renewal of Let's Encrypt Certificates Using Plesk

Posted on Tue 14 June 2016 in Sysadmin • Tagged with Apache, certificate, let's encrypt, Plesk, SSL, web server

Note to self: If the Let's Encrypt extension for Plesk fails to renew a certificate (when triggered manually), disable the automatic forwarding to an SSL connection in the Apache settings. This forced secure connection seems to disturb the renewal script.

The error I got was something like this:

Let's …

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Create Custom Application Icons for MacOS X

Posted on Sun 01 May 2016 in General Software Development • Tagged with icons, Mac

This blog post by Chris Stevens shows you how.