Google Code Jam 2009 – Qualification
Posted by Jeroen van Erp terribly early in the morning: September 4th, 2009
Aliens sending messages, Water flowing over a map and finding the hidden Welcome message in a String... Yes, Google Code Jam has returned for the 2009 edition! I participated in the Qualification Round and managed to solve all but 1 input set....
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ShuntingYard algorithm in Scala
Posted by Jeroen van Erp just before lunchtime: July 2nd, 2009
Last week I came across an interesting "coding kata" by Brett Schuchert on the Object Mentor blog. The trick of a kata is that you grow the program step-by-step using tests, just like a kata in karate is tought to a student. The problem of this kata was the Shunting Yard algorithm of Dijkstra. I wanted to see if I could implement this kata in Scala.
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Beware of transitive dependencies… For they can be old and leaky
Posted by Jeroen van Erp around lunchtime: September 15th, 2008
In many JEE apps today, you almost cannot forgo XML. Whether it is in configuration, data structures or service interfaces, you will certainly use a number of XML files. In a recent project we had to deal with a number of external services which used an XML interface. Little did we know that we introduced a potential time-bomb in our application... (more...)
JavaOne 2008 Day Two
Posted by Jeroen van Erp mid-morning: May 8th, 2008
Today was the second day of the JavaOne 2008. Besides doing a lot of chatting in the JavaOne pavillion, and visiting all the cool parties this night, we also went to a number of sessions. Also today the NLJug had the James Gosling meeting we won for being the biggest JUG out here. After a long day of work, we finally had time to relax at the Adobe party and at the SDN party.
Todays topics included:
- Closures
- JavaFx, Groovy and Google Android
- Swing GUI testing
- Scripting
DateTime and TimeZone pains
Posted by Jeroen van Erp at around evening time: March 31st, 2008
For as long as Java has been around, java.util.Date and java.util.Calendar have been nuisances. This will hopefully very soon be a thing of the past with the addition of JSR-310, the Date and Time API, to the Java API. At the basis of JSR-310 lies the Joda time library, which has been around for quite some time as a replacement for the standard Date and Calendar classes. However that this API is not without its own peculiarities need not come as a surprise, given the complexity of the human interpretation of time all over the world.
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Maven2 Dashboard Plugin Released
Posted by Jeroen van Erp in the wee hours: March 27th, 2008
Quality is an everyday part of the life of a Xebia software developer. One of the ways to get insight into quality is by looking at metrics like FindBugs, PMD, Simian, Code Coverage, etc. With large software products consisting of different modules, quality assurance can become quite a trying task. This means that tools which alleviate this burden are a welcome addition to our toolbox.
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JavaOne 2008 Scripting preview
Posted by Jeroen van Erp at around evening time: March 13th, 2008
The biggest Java event of the year is coming up again, the JavaOne. For me this is a place of inspiration. Seeing the newest technologies in action and talking to some of the great minds in the Java world, how can one not become inspired!
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Leaking Memory in Java
Posted by Jeroen van Erp around lunchtime: October 4th, 2007
Don't we all remember the days when we programmed C or C++? You had to use new and delete to explicitly create and remove objects. Sometimes you even had to malloc() an amount of memory. With all these constructs you had to take special care that you cleaned up afterwards, else you were leaking memory.
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Testing with(out) aspects
Posted by Jeroen van Erp in the late evening: September 26th, 2007
Recently I wanted to add an aspect to some domain object, so that it was saved, the moment it changed state. However, after adding this aspect, the whole build of course failed, because a lot of the unit tests weren't expecting the calls which were now woven into the domain object.
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If it looks like XML…
Posted by Jeroen van Erp in the early morning: August 17th, 2007
And walks and talks like XML, it surely must be XML. Yes, well how wrong you can be about assumptions is once more shown in this blog.
One of our clients has an application through which videos are streamed. They do this by providing a browser embedded player, or your stand-alone Windows Media Player with an ASX file. The ASX file tends to look like this:
<asx Version="3"> <entry> <ref HREF="http://www.somecompany.com/videos/video.wmv"/> </entry> </asx>
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