Author: cen
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OJDBC7 in a Docker container? Prepare for trouble
Scenario: A JDK8 Docker container using OJDBC7 to connect to the database. Sounds simple enough, what could go wrong? Simptoms: Connecting to the database randomly takes several minutes, fails with a weird SqlRecoverableException: no more data to read from socket or just works fine as if there is no problem. The same Docker image also…
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JPQL: getting whole entities on a distinct column
If you want distinct entities in JPQL you would normally write something like this: SELECT DISTINCT(l) FROM Letter l WHERE l.name=:name; But this will do a DISTINCT on the whole Entity. This will also fail on Oracle DB if your Entity contains a CLOB. What if you really want to do a DISTINCT on a…
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Fedora 24 XFCE pains and gains
I recently installed Fedora 24 XFCE on my brand new Entroware Apollo, a Linux friendly laptop. Here is a list of problems I encountered during my first week of use. While most of these problems had a solution with a bit of googling, non-tech savvy person would have severe problems solving them. PAINS System completely…
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Qt 5 + MSVC 2015 + OpenSSL + Windows XP Support = absolute mess
Recently I decided to move all of our C++/Qt based projects up to the latest version of Qt and C++ toolkits. That means Qt 5, Visual Studio 2015 and all the latest libraries which are needed either for Qt or standalone. There was one caveat tho.. we still need to support Windows XP because a…
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Rode NT-USB Linux support
Googling around, I could not find a single mention whether Rode NT-USB microphone supports Linux or not. After some semi-encouraging words from Rode support I decided to go ahead and buy it anyway. I am happy to announce that it works out of the box and so far I did not encounter any problems on…
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The state of SVG rendering
This is an interesting little experiment I did when I was searching for a FreeBSD SVG logo to put on a poster. As you might know, SVG format is for vector images, allowing for infinite scaling without pixelation, which is exactly what you need, if you are going to print something on a big quality…
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Periodically pause and resume Transmission torrents on TrueNAS
Unless you have great internet bandwidth you probably don’t want to leech and seed your 100 torrents during the day. You usually want them to seed during the night and then pause in the morning. Let’s do this on our TrueNAS box. Open up your jails, select transmission and fire up the shell. If you…
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My personal FreeNAS build and review
This post will talk about how I built my own FreeNAS box, including a short review of the components used. I will also try to mention all the problems and pitfalls that I can remember. Components used ASRock C2550D4I SilverStone DS380 SilverStone SST-ST30SF Crucial 8GB ECC DDR3-1600 CT102472BD160B 4x HGST Deskstar NAS 4TB Lian-Li PT-FN03…
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Writing a Windows installer using Qt
Most of the time you don’t want to write your own installer for distributing software. You use an off-the-shelf installation program that packages it all up for you instead. But if you feel adventurous or need your installer to perform some very specific tasks you probably want to write your own. This post will shows…