All the colors of Java and so on

I downloaded Galileo a few days ago. But, when I tried to test my webapp on my favourite Tomcat, I discovered that it missed the corresponding adapter. Wooo... After some searches (thanks to Google), I found the easiest way to install it and (by the way) all the other adapters. From the WTP update site (http://download.eclipse.org/webtools/updates/), select and install JST Server Adapters.

That's all!

Today, I need to move a project from a first subversion repository to a second one. To do that, you need to have an access to your SVN server.

So, we will use the following commands :
svnadmin dump to backup the repositories (I insist on 'repositories'. I think it's important to have backups of all repos before doing such operations)svndumpfilter to reduce the backup scope to a single project because the dump can only be done on the entire SVN repositorysvnadmin load (I think you can guess what this wonderful command does)To understand this commands, it's important to know that svnadmin uses standard inputs and outputs. Thus, we can combine commands with pipes.


Let's save our project (with all its history, tags, branches...)

svnadmin dump /home/subversion/svn/repo/ | svndumpfilter include myproject > svn.myproject.dump

Now, let's backup our target repository :

svnadmin dump /home/subversion/svn/new_repo/ > svn.new_repo.dump

And let's import the project on th…

In the previous post, I talked about how to start a Windows XP image downloaded from Microsoft to be able to test your web application with Internet Explorer.

On Ubuntu 8.04 and Virtual Box OSE (Open Source Edition) 2.0.4, there are some fixes to do before being able to work with the hosted mode network interface.

I took the following instructions from the french Ubuntu forum (http://forum.ubuntu-fr.org/viewtopic.php?id=217680).

1) install bridge-utils and uml-utilities (sudo apt-get)
2) add the vboxusers usergroup to your user :

$ sudo usermod -a -G vboxusers

3) Create a bridge by modifying you /etc/network/interfaces file

For DHCP conf

$ sudo gedit /etc/network/interfaces
auto eth0
iface eth0 inet manual

auto breth0
iface breth0 inet dhcp
bridge_ports eth0

# The loopback network interface
auto lo
iface lo inet loopback

For static IP conf

$ sudo gedit /etc/network/interfaces
auto eth0
iface eth0 inet manual

auto breth0
iface breth0 inet static
bridge_ports eth0
address 192.168.0.2
netmask 255.25…

This is a title I found on a blog (http://www.railsgeek.com/). You all know this kind of crisis when delivering a web application developed on your favourite Linux with FireFox : your piece of software crashes on Internet Explorer. You also know how it's difficult to have a IE quickly running on your Ubuntu. Perhaps you tested IE4Linux but it's an old projet. Thanks to Microsoft (yes, I can say this), you have a solution from now.

1) Go to the Microsoft download website : http://www.microsoft.com/downloads
2) Enter 'vpc images' in the search text field
3) You will have an answer titled :

IE App Compat VHD
VPC Hard Disk Images for testing websites with different Internet Explorer versions on Windows XP and Windows Vista

4) Click on the link and download an image (I took IE7-XPSP3.exe)
5) Rename it with the rar extension (ie IE7-XPSP3.rar) and unrar it
6) Install VirtualBox with Synaptic. This excellent software is able to read Microsoft Virtual PC image disk (VHD)
7) The first …

Just a tiny link to a really interesting website which concentrate common and useful linux command lines :

http://www.commandlinefu.com

Thanks Marco for this URL!

Simple but powerful, you just need to be in your lib folder and type :

export CLASSPATH=$(pwd)/*

That's all!

It's exceptional but I wrote this post in french. It's about a contest which proposed to developed a tiny Apache Wicket project with another framework. I tried to implement it with SmartGWT.

Bon et bien voilà : je livre mon appli ZenContact migrée en GWT. Je vous préviens, je ne vais pas trop mâcher mes mots. L'objectif du concours est assez clair : refaire une petite appli de gestion de contacts réalisée à l'occasion d'une présentation Wicket au Paris JUG; le tout avec un petit défi en plus car cette présentation menée par Zenika n'a duré qu'une heure.

Bref, devant l'enthousiasme général, j'ai entrepris de la refaire en GWT. Et comme il fallait aller vite, j'ai choisi de m'appuyer sur des outils et API pour avoir le moins à coder possible. Je fixe rapidement la stack de travail : Eclipse 3.4, Maven 2, SmartGWT. Bon, c'est parti! New maven project -> template gwt. Je teste l'application générée par le plugin Maven. Jusque là tout es…

To achieve the previous post, I had some problems today to access to my tomcat server from another machine. Ping OK but telnet 8080 KO... Humm, this smells firewall rules. Bingo! I didn't considered iptables as a firewall but it's one!

So, if you are in a secure network area, you can disable it temporarily with the following command :
sudo iptables -FYou can go further by reading this how-to page : https://help.ubuntu.com/community/IptablesHowTo

While working on project, I had to bind my Tomcat to port 80 (instead of deploying an Apache and configuring its mod_jk). But, as you should know, Unix systems contains default security rules. Ports below 1024 are only allowed to the root user. Humm... it was time to work with iptables!

The following commands would show you how to add a rule to redirect request on port 80 to port 8080 and how to remove this rule.

Adding a rule :

sudo iptables -t nat -I OUTPUT --src 0/0 --dst [YOUR_IP_HERE] -p tcp --dport 80 -j REDIRECT --to-ports 8080

Saving it :

sudo iptables-save

Listing rules :

sudo iptables -t nat --line-numbers -n -L

This will show rules ordered by REDIRECT, PREROUTING, POSTROUTING and
OUTPUT. Each line start wil a number.

Deleting a rule :

sudo iptables -t nat -D [REDIRECT, PREROUTING, POSTROUTING or OUTPUT] number

Ex : sudo iptables -t nat -D OUTPUT 1

Today, Romain Gauthier (OCTO Technology, for the moment) sent me a funny post on Agile development. I really like Agile methods but it's so funny that I had to paste it here :

Why is agile software development like teenage sex?
It's on everyone's mind all the time.Everyone is talking about it all the time.Everyone thinks everyone else is doing it.Almost no one is really doing it.The few who are doing it are:
doing it poorlyhopeful it will be better next timenot practicing it safelyUnfortunately, it sticks to reality... Bahhh, Romain, I hate you. You tried to shake me but I will continue to promote SCRUM.

Source : http://dnicolet1.tripod.com/agile/index.blog?entry_id=1877790

I've just fined a tiny article which describe how XML parsers detect document encoding. I hope you already know this but it always good to read it again. In a few words, parsers use the first document characters which are the same in all xml document and try different ways to read them and evaluate encoding.
http://www.xfront.com/specifying-encoding/index.html

[VOSTFR] Steve Jobs Stanford Commencement Speech, 2005

Thanks Mister Jobs! I think that I will listen to you over and over.

Today, my friend Marco sent me a great blog entry on Maven best practices. In a few words, it says :

Automate Snapshot Deployment by integrating your project in a CI system (like Hudson)Isolate Local Repositories using use -Dmaven.repo.local=xxxx option to define the unique local repositories for each build.Regularly Purge Local Repositories (mvn dependency:purge-local-repository)Enable Batch Mode with the -B option to reduce log sizeEnable Full Stack Traces (-e) when there's a build errorPrint Test Failures to Standard Output (in your settings.xml : true)Always check for Snapshots (-U option); useful when your project is split in modules and libraries. This ensures you always have the last dependency library release on your project.

Click here to see the full post : http://blogs.sonatype.com/people/2009/01/maven-continuous-integration-best-practices/

Thanks Marco!

I started today to find the simplest way to make my Eclipse look better on Ubuntu. I've got a laptop (so, I'm used to work with an LCD screen). Here is my solution :

Step 1 : install the ttf-liberation package
Step 2 : open your system->preferences->apparence menu. Go to the font tab and change fonts like that :

Application/Document/Desktop font: Liberation Sans, size 9
Window title font: Liberation Sans Bold, size 10
Fixed with font: Liberation Mono, 10

Select the LCD screen optimization features (including in the User Details options).

That's all!

Today, my friend Marco gave me a great API which can help on auto completion forms. This spelling API is based on a ternary tree and seems to be a good entry point to build a search engine.

Thanks Marco!

http://jaspell.sourceforge.net/

I haven't published any post about GWT for a long time. Today, I found a website showing GWT widgets, panels, listeners... in action. It's great when you have to make choice between two kinds of panel; this site allow you to see their behaviors.

http://examples.roughian.com/

Do you know the difference between Adapter and Decorator patterns?

These two patterns are made to wrap objects. Humm... Same goals? Not exactly. On the first hand, the Adapter pattern is used to transform your class interface contract to another one. In the real world, you use it to "adapt" your code to an external piece of code you need.

In the other hand, with the decorator pattern, your class keeps its interface contract. You just wrap your code to bring some new features. For example, you decorate a class to integrate a counter on method calls and perform a performance test.

Just a link to an Oracle quick start guide to remember :

http://www.exforsys.com/tutorials/oracle-9i.html

Recently, I started to work with IntelliJ. But, honestly, after several years with Eclipse, it's hard to be effective because of key shortcuts which are different between the two IDEs. A little request on Google and I found this (great!) :

DescriptionEclipse shortcutIntelliJ ShortcutNavigate a Java TypeCTRL + ALT + TCTRL + NNavigate a ResourceCTRL + ALT + RCTRL + SHIFT +NLast Modified SourceALT + Left arrowCTRL + ALT + left arrowDebugF11Shift + F9Open DeclarationF3CTRL + SHIFT + BOpen HierarchyF4CTRL + HOrganize ImportsCRTL + SHIFT + OCTRL + ALT + OFindCTRL + FCTRL + FFind Again/ previousF3 / SHIFT + F3F3 / SHIFT + F3Step IntoF5F7Step OverF6F8Step OutF7Shift + F8ResumeF8F9To find impl of an abstract Method?Ctrl + Alt + BTo find usageCTRL + SHIFT + GAlt + F7

Yes, it's time to start a new project. A classic fact is that user specifications are not yet completely defined. Humm, but I need to start the project. The only solution will be to be agile. So, let's SCRUM. It's the first time for me. I read some docs from the past but I never really tried it. Thus, I spent this evening reading charts, blogs, etc... I also found a good french video preformed by a SCRUM senior (having 4,000 hours flying on agile projects) :


Planification et gestion de projet informatique : SCRUM
par intellicore