Software

Testing Kotlin extension functions

Jul 1, 2020 · 2 min read · Kotlin ·
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This might seem obvious for many Kotlin programmers but I did not realize that extension functions are also applied to mocks. This means that if you have a class you can not instantiate for some reason, like the constructor is private and in another package, or the class is abstract, you can still test your extension …
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Reading an ISKRA AM550 P1 Port with a Pi

Jan 17, 2020 · 3 min read · environment ·
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Although I am the guy with a soldering iron and a bit of software development experience, I am not a fan of the "internet of things", "smart meters" or smart anything really. Not because I don't like technology, but because of the potential security and privacy problems it brings with it. That said, …
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Travis CI and Dependabot added to Anonimatron

Apr 26, 2018 · 2 min read · Anonimatron security Utilities ·
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With new European rules like the GDPR and local variations like the Dutch AVG, interest in Anonimatron is increasing. Although I do not keep track of who is using it and where, sometimes new requirements do pop up. Recently a feature was added to Anonimatron 1.9.2 to also anonymize files. In the wake of those …
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JSON alerts for Munin

Jan 7, 2018 · 3 min read · monitoring munin Ubuntu Utilities ·
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Munin is a great and easy way to monitor your servers. The documentation for Munin is kind of all over the place, and sometimes not all that clear. * There is the recent ["Munin Guide"](https://munin.readthedocs.io/en/latest/) which is quite informative and well laid out. Sometimes additional info and …
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Fixing a Jenkins 1.5 Slave on Windows 2016

Jan 1, 2018 · 1 min read · jenkins programming ·
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When you configure a Jenkins 1.5x slave on a Windows 2016 machine according to the instructions on wiki.jenkins-ci.org you will probably get a warning that the .Net 2.0 is not available. This is reported as issue 21484 and the fix is to upgrade, which sometimes can be a problem. If you can't upgrade to the latest …
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Mattermost Delete Channel "fixed"

Oct 26, 2017 · 4 min read · hamradio programming security usability ·
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Users of Mattermost have probably noticed the less-than-optimal interface design where de Delete option is right above the Leave option in the Channel menu. On a busy server, you can imagine having quite a few incidents where people accidentally completely delete a channel. In the Open Source version of Mattermost, …
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Installing GPG keys for Debian Backports

Jun 9, 2017 · 2 min read · Debian linux security ·
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For Let's Encrypt to automatically renew certificates on your Raspberry Pi, you probably want to install certbot. The installation instructions of certbot tell you to make use of the Debian Backports packages. Following the instructions to install backports packages into apt-get on raspbian (which is a Debian Jessie), …
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Make the ESP8266 talk 9600 baud

Jan 2, 2017 · 3 min read · Arduino hacking programming Utilities ·
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The default serial speed on the ESP8266 WiFi chip is 115200 baud. If you connect this chip to an Arduino and want to use SoftSerial to talk to it, it will not work. The SoftSerial library is limited to 9600 baud because of hardware limitations of the Arduino. If you want to talk to the ESP8266 with an Arduino at lower …
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Solving the JAXB "unexpected element" problem

Jun 8, 2015 · 2 min read · Java jaxb maven programming Utilities ·
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If you are using JAXB in a maven/java project to unmarshal an XML document and you get: javax.xml.bind.UnmarshalException: unexpected element (uri:"urn:iso:std:somestuff:xsd:somestuff", local:"Document"). Expected elements are (none) Or if you are using JAXB to marshal an XML document and you get: …
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Import/export an Oracle Schema using JDBC

Jan 2, 2015 · 3 min read · Java JDBC oracle programming Utilities ·
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When doing integration testing or fixing a bug in a piece of Java code that uses Oracle as a database, being able to do quick exports and imports of your schema can be a big help. Sometimes just calling Oracle's imp/exp commandline tools from your code can be of help, but I was looking for something a bit more portable …
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