Saturday, April 11, 2015

How to fix org.apache.xmlbeans.XmlException: error: Unexpected character encountered (lex state 3)

I have encountred this error while trying to communicate with a webservice that returns in its XML a url containing a "&" character. While parsing the XML response my web server gives this error : "org.apache.xmlbeans.XmlException: error: Unexpected character encountered (lex state 3)".
The solution is to replace this character by "&" before parsing the XML response.

response = response.replaceAll("&", "& a m p ;"); 
That's all you need to do. It means that the xml document you're parsing isn't perfect.

How to delete control+Q keyword shortcut from ubuntu

There is a very annoying keyword shortcut for those who have used both Azerty and Qwerty keyboards. Actually, it's the ctrl+q shortcut. Some old reflexes come back to me since I used to have a french keyboard and it happens that I want to select all content using ctrl+A but suddenly the whole application shuts down.

In order to delete this shortcut, You need to go to :

System > Preferences > Keyword

Add a new Ctrl+q shorcut to the /bin/false command.
if the keyword preference windows shuts down when you try to add the ctrl+q shortcut, try to add another one. ctrl+j would do.

Then use your console to navigate to :


and edit this xml file with gedit if you want and change the ctrl+j by ctrl+q.

Then you need to reboot to activate those changes.

That's all.

source link.

Tuesday, March 31, 2015

Cannot enable Crtl+space shorcut for Content Assist in Eclipse for Ubuntu

Sometimes, some conflicts in keyboard shorcuts can drive you nuts ! After reading dozens of forum discussions about this subject. I have found the solution in this link.
Actually, you need to change the Ibus keyboard shorcut (control+space) so it doesn't "eat up" your magic shorcut on Eclipse.

Now you can go ahead and enjoy your programming !

Saturday, February 18, 2012

How to call Matlab functions from a Java program

Matlab is a very reputed piece of software specially among researchers and graduate students. It allows users to code complicated algorithms thanks to its rich libraries that implement many mathematical functions and statistical models. You may have ever used it to implement some classification processes that deals with heterogeneous data and you have got some interesting results and you wanted to show it to a client. He may not be interested in your statistical model nore in your charts and graphs. He is interested in a beautiful application with an ergonomic user interface with big shiny buttons that allow him to use you piece of program. He is interested in the usability of your program more than the academic process that allowed you to get your result.

So to make this happen, you need to implement a simple prototype that calls your Matlab functions and show resluts in a simple GUI. If you're a Java savvy, or you prefer java to make this happen you need to use the MatlabControl API. It's a simple Java API that allows you to call Matlab functions and execute eval, feval and other commands.

All you need to do is to download the jar file and add it to your classpath and use this code to open a Matlab session.

MatlabProxyFactoryOptions options = new MatlabProxyFactoryOptions.Builder()


MatlabProxyFactory factory = new MatlabProxyFactory(options);

MatlabProxy proxy = factory.getProxy();

After that you need to change your Matlab current path to your Matlab script path using CD command and then you can execute call your function:

proxy.eval("cd C:/Users/MyName/Desktop/MyScriptFolder");

If you need other details about variables and parameter you can use the API Walkthrough or check out the API Javadocs.

Monday, January 02, 2012

Writing Java code in blogger posts

I've been looking for a simple way to help me tweak my blog to show Java code.
This is what I've got after some changes in the blog template.

// Comment
public class Testing {
public Testing() {

public void Method() {
/* Another Comment
on multiple lines */
int x = 9;
All you have to do is changing your blog template and add some scripts so you can use the "SyntaxHighlighter" Library.
It works thanks to this post.

Tuesday, September 14, 2010

Web-Desktop Application for Network Monitoring and Alert Management.

Currently, computer networks are the backbone in the remote communication. Now they have become essential for the proper functioning of many domains and applications. Their rapid growth induces increased complexity of administration tasks and fault detection. Any problems or failure may have serious consequences forcing the use a system of monitoring and alert management.

The network monitoring has become therefore a major task not only the ensure the system retention and good functionality but also to have a global view on problems that may occur to prevent their appearance. As the task of the administrator is to ensure the smooth functioning of its network and manage heterogeneous devices, administrators were then forced in the past to work on a machine connected to the network which makes their task more difficult and may risk delaying critical tasks. Thanks to advances in technology and the evolution of the Web, this monitoring task has become more flexible.

In fact, the administrator is now able to monitor its network remotely via a web application that provides network monitoring and is capable of describing its condition and report alerts when this is necessary. Hence, it can remedy problems and resolve them as quickly as possible.

Indeed, this application starts with the automatic detection of network equipment (Routers, firewalls, terminal) which allows to draw the map showing equipment found to give the administrator a clear view on its network. The administrator can also predefine the annoying problems that which he judges to be important to be notified when they occur. Once one of these problems is encountered, an alert will reported to the administrator to inform him about the problem detected, its severity and its location so that he becomes able to correct it immediately.

The main objective of this project is to develop a web application for network monitoring and effective management of alerts. This application should be able to monitor services and network resources (routers, terminals). The following video is a demonstration of the project.

Monday, September 06, 2010

Introducing EXT JS

EXT JS is a javascript library which is build to offer web developers the ability to make interactive web applications using Ajax, DHTML and DOM scripting.

The new tendency in the last deacades in software development is the "rich Internet application". To be close to desktop application, you should have some advanced web

graphic tools and frameworks. Extjs has all the features to allow you to develop your rich Internet application.

The predefined tools such us grid, forms, panels and menus are rendered client-side.You don't have to wonder about compatibility. It's designed to work perfectly on any common browser.

Coding and editing Ext js scripts is fun. Since there are many examples with the downloaded package of the library and it has a very helpful community. These are some Screeshots of what this library is capable of:

Monday, March 16, 2009

How to make vi colorful on xubuntu

We started to study shell programming in school and we use VI to code some scripts. I noticed that all my colleagues using vi on ubuntu are very irritated and seem to envy their friends who use VI on Fedora 10 because it's very easy to use and colorful, it helps to detect syntax errors. Some of my friends started to regret installing Ubuntu instead of Fedora and even blamed me for recommending it. As an Ubuntu fan I looked for a solution for this tiny problem. I won't accept any lame remark about Ubuntu !! you need a colorful VI ? Here you are !

1- You have to install VIM which is "vi Improved" just tape this code in your console:

sudo apt-get install vim

2- After installing it you have to edit a file () and uncomment a parameter. To do so first you have to turn into root so type su and enter your root password:

then change this file mode for writing (so you can change its content)

chmod +w /etc/vim/vimrc

no open this file using vi if you want and uncomment syntax on. i.e erase the (") before syntax on in line 20.
vi /etc/vim/vimrc
After doing that save changes and exit using :wq
try writing something, save it and re-open it and you will find your beautiful colorful script. ENJOY !!

Xubuntu and low performance machines : The perfect match !

When the machine gets old and becomes useless. You get short on options. You can't sell it because you are so emotionally attached to it and it doesn't worth that much and you can't run new applications on it because it can't afford them. But you can turn it into a beautiful workstation. Able to open your pdf documents, play your music and videos and does your office tasks... You need just a light operating system that doesn't consume much hardware resources.

I'm talking about a Linux system of course so you won't spend any dime on proprietary software and you can avoid the headaches of the anti-viruses and etc...
The choice was : xubuntu .

I installed xubuntu 8.04 on my Compaq Armada notebook. This notebook is really a disaster running with WinXP but not bad with Windows 2000 and this is its configuration :
Intel Pentium III 750 MHz
64 MB Ram
20 Go hard disk

Pathetic isn't it ? But it was all I had when I needed a Linux system for my SHELL programming courses. I downloaded the Xubuntu which is an ubuntu distribution designed for low performance machines and it was just perfect. The graphics were nice and simple. Most of the applications run properly. The execution of the system in the start up doesn't take much time.
You can see down here the "system monitor" and how xubuntu is using the ressources of the machine.