Java Bien!

Unit test verbosity

David Gageot — Fri, 27 Jan 2012 17:16:26 +0000

Here is a sample test method I found in one of my customer’s codebase. What do you think? What’s the minimum number of lines really needed to write the exact same test? The sad thing is that, in the codebase, there are hundreds of tests like this one. All copy/pasted from the same verbose template. [...]

Code Story – Devoxx France

David Gageot — Thu, 17 Nov 2011 19:18:45 +0000

Notre projet Code Story va se dérouler en 3 phases : une pré-sélection, une sélection, une session à Devoxx France. Commençons par la fin pour comprendre le but de notre démarche. “Code Story” à Devoxx France Nous, David et Jean-Laurent, souhaitons coder à Devoxx France, une application en direct, en 2 jours. L’idée est de [...]

Devoxx France

David Gageot — Wed, 16 Nov 2011 09:05:21 +0000

Dans un de ces moments “One More Thing” que l’on aime, Stephan Janssen vient de dévoiler une nouvelle qui réjouira tous les geeks francophones. Une “French édition” de Devoxx aura lieu à Paris les 18, 19 et 20 avril 2012. Si j’étais Nicolas, j’écrirais : “Toi lecteur qui fait l’impasse sur Devoxx, au chaud dans [...]

Mister Jobs, you’ve changed our lives

David Gageot — Thu, 25 Aug 2011 05:57:13 +0000

Today, Steve Jobs resigned from Apple. The first time, I heard about mister Jobs, I must have been about 12. My Dad brought a Mac home and opened the case to show me the names engraved inside. I don’t remember if I was astonished the most by the signatures having the look of Han Solo [...]

Université du SI 2011

David Gageot — Thu, 17 Feb 2011 15:49:33 +0000

L’édition 2011 de l’Université du SI aura lieu les 28 et 29 juin prochain. Cette année, cette très belle conférence s’articulera autour de ces 4 axes : Autrement : inspirations issues d’autres domaines (ex: sciences, architecture, médical), éditeurs de jeux vidéo, grands du Web, Big Mashups, DevOps. Techniquement : cloud en pratique, virtuoses du code, [...]

Is ‘final’ keyword always safe to add/remove?

David Gageot — Fri, 14 Jan 2011 16:05:17 +0000

If somebody asked me this question “Is it always safe to put/remote ‘final’ keyword on a read only local variable?”, honestly I would have answered “Yes”. Until I read JavaPuzzlers by Joshua Bloch and Neal Gafter and realized what a little variant of puzzle #8 would look like: What’s the output of this code? public [...]

Soirée spéciale Tests Avancés au Paris JUG

David Gageot — Thu, 23 Dec 2010 20:15:09 +0000

J’aurais l’honneur d’animer le prochain Paris JUG, le 11 janvier. Triple honneur puisque qu’il s’agit non seulement du premier JUG de l’année 2011, de mon deuxième JUG en tant que présentateur et enfin d’une soirée exceptionnelle animée par moi seul. J’ai une grosse, grosse pression ! Voici le programme, que j’espère vous apprécierez: Comment j’ai [...]

Classloader dead-lock hell

David Gageot — Fri, 10 Dec 2010 18:28:15 +0000

My previous post presents a typical classloading dead-lock. Java classloaders are lazy by nature and when two different threads need to load two classes with a cyclic dependency (A references B, B references A), there is a good chance that the two threads end up being blocked one by the other. Here is the simplest [...]

Wednesday night puzzle

David Gageot — Wed, 08 Dec 2010 22:51:37 +0000

What’s the result of running this piece of code? a) Done. b) InterruptedException is thrown c) It depends d) Code doesn’t compile import java.util.Vector; public class Main { interface A { } static class AImpl implements A { static AImpl DUMMY = new BImpl(); } interface B extends A { } static class BImpl extends [...]

False warnings in IDEA Intellij, what a pain!

David Gageot — Tue, 07 Dec 2010 10:52:21 +0000

I’m a big fan of Eclipse, I’ve been using Visual Age and the very first version of Eclipse. It’s far from perfect but I’ve come to know its weaknesses and became quite efficient. Every once in a while I take some time to evaluate Intellij IDEA, because, you know, its SOOOOO much better than Eclipse. [...]

Fun with the RPN calculator in Ioke

David Gageot — Fri, 06 Aug 2010 20:19:56 +0000

In this article, Cédric Beust explains how to port a RPN calculator from Haskell to Fantom. It could have made me want to code more in Haskell or go discover Fantom. Not at all. Reading the article, I felt the urge to code the same algorithm with Ioke. You know, this language I discovered through [...]

Technical retrospective after 2 years at Algodeal

David Gageot — Fri, 16 Jul 2010 16:36:36 +0000

For two years I’ve been working at Algodeal. Two great years full of fun and challenges, going back to full-time developer after 4 years of technical consulting and agile coaching. Being the CTO at Algodeal, I thought that hiring a small team of talented people and being an equal part of this development team would [...]

Mon programme pour USI2010

David Gageot — Thu, 06 May 2010 20:10:34 +0000

Hier soir, Octo recevait presque tous les speakers qui animeront une présentation lors de la conference USI 2010 les 1 et 2 juillet prochains. Tout d’abord, merci à Octo pour cette soirée très sympathique et plutôt drôle. L’occasion était donnée a chaque speaker de présenter son sujet en une minute. Toutes ces minutes, mises bout [...]

Crush .png images at commit time with git hooks

David Gageot — Sun, 28 Mar 2010 14:46:27 +0000

If you are a little involved into writing web applications, you have to know Yahoo!’s YSlow and Google’s PageSpeed. These are two Firefox plugins to help you accelerate a web site. One thing they will help you do is to reduce the size of all those png images to decrease bandwidth. Sure png images are [...]

Git bisect might save your day

David Gageot — Tue, 23 Mar 2010 20:08:54 +0000

The day maven ruined my day (again…) Yesterday, I lost 2 hours because our Maven project at Algodeal wouldn’t build anymore. I couldn’t execute: mvn eclipse:eclipse nor run the full build. With the help of a colleague, we found out that only a two steps build would do the trick: mvn clean install -DskipTests;mvn eclipse:eclipse [...]

Deep stubbing in Mockito

David Gageot — Tue, 19 Jan 2010 10:48:34 +0000

Next version of Mockito, my favorite mocking/stubbing framework, will provide deep stubbing. This kind of test code will become possible: @Test public void canStubOneLevelDeep() { OutputStream out = new ByteArrayOutputStream(); SocketFactory socketFactory = mock(SocketFactory.class, RETURNS_DEEP_STUBS); when(socketFactory.createSocket().getOutputStream()).thenReturn(out); assertThat(socketFactory.createSocket().getOutputStream()).isSameAs(out); } Notice the two chained calls in a when clause. Isn’t it cool? I think that’s cool. I [...]

Serverless Continuous Integration with Git

David Gageot — Tue, 01 Dec 2009 09:02:21 +0000

“Why use a continuous integration server?” That’s the question we ask at Algodeal. Having spent years preaching for each team to use a CI server, we installed and used Hudson since the very beginning of the project. However, it’s been months since anybody looked at the Hudson dashboard. Every commit breaks the build. And you [...]

Google collections and enhanced JavaBeans

David Gageot — Wed, 04 Nov 2009 20:52:13 +0000

I’m a big fan of Google Collections. Functions and Predicates became my best friends to make Java’s syntax a bit functional-like. I like writing things like: List<Contact> contacts = ... List<String> toStrings = Lists.transform(contacts, Functions.toStringFunction()); and with the help of static imports: List<String> toStrings = transform(contacts, toStringFunction()); If you use out-of-the-box Functions and Predicates, it’s [...]

Intégration Continue sans serveur (MAJ)

David Gageot — Sun, 25 Oct 2009 13:36:19 +0000

lquestion que nous posons chez Tech4Quant. Des années à prêcher pour que chaque équipe ait un serveur d’IC. Nous avions installé et utilisé Hudson dès le début du projet. Et voilà que depuis plusieurs mois, Hudson installé on ne sait plus où, échoue à chaque commit et personne ne s’en émeut. Comment en arriver là [...]

Moved to http://javabien.net

David Gageot — Mon, 03 Aug 2009 06:27:51 +0000

Hi all, This blog was moved to http://javabien.net. Please update your bookmarks or better add this blog to your favorite news reader. David. Redirect 301 /wordpress/index.php/archives http://blog.javabien.