All the colors of Java and so on

Since I migrated my laptop (HP 4720s) to Ubuntu 11.10 with gnome-shell, I have the following issue :
the open source ATI drivers works well but my fan is always spinningthe additional drivers proposed by Ubuntu don't work and make gnome-shell unusablethe drivers (11.9) from AMD is very slow

So, for the moment, the best deal for me is to keep the open source drivers. DON'T INSTALL ANY OTHER DRIVER THAN THE ONCE INSTALLED BY DEFAULT. What we will do is to underclock the GPU to keep the temperature acceptable and avoid any problems with the fan. Let's open a terminal :echo -e '#!/bin/sh\necho low > /sys/class/drm/card0/device/power_profile' | sudo tee /etc/init.d/ati-power-savesudo chmod +x /etc/init.d/ati-power-savesudo update-rc.d ati-power-save defaults 99By the way, we will increase FPS by disabling vertical sync.

echo 'export vblank_mode=0' | sudo tee -a /etc/environment
Reboot and enjoy the silence!

Ubuntu 11.10 is provided with Unity, the graphical user interface from Canonical. Compared to the previous release (Ubuntu 11.04), you can now swith to Gnome Shell. But, why should you swith from Unity to Gnome Shell that you could consider as very similar? My opinion is that Gnome Shell is more pragmatic and beautiful than Unity.
So, how to activate Gnome Shell ? Go to the software center and activate the patner repositories in the software sourcesIn a terminal, run sudo apt-get install gnome-shellActivate it by default with sudo /usr/lib/lightdm/lightdm-set-defaults -s gnome-shellReboot and enjoy!Now that you have almost a prefect shell, you should install some addons : sudo apt-get install ubuntu-restricted-extras (for flash, java and dvd features)enable dvd decryption with sudo sh /usr/share/doc/libdvdread4/install-css.shsudo apt-get updatesudo apt-get install chromium-browsersudo apt-get remove firefoxsudo apt-get install smplayerA good thing is also to enable numlock on lightdm : …

I found it today and I read some interesting stuffs about SCRUM and software development :
http://elegantcode.com/

My company uses an ERP mainly developed in PL/SQL. And we need to deal with external systems. Today, I found a project. It could really help :
http://code.google.com/p/plsql-utils/

I found this today : http://java-persistence-performance.blogspot.com/. It has some good tips about JPA tuning.

This is what I had today. After some two weeks long holidays, my Ubuntu distrib installed with WUBI refused to start. This is the solution I found to get back my files :

sudo fdisk -l
sudo mkdir /win
sudo mount /dev/sdxy /win
sudo mkdir /vdisk
sudo mount -o loop /win/ubuntu/disks/root.disk /vdisk

(Source : http://neosmart.net/forums/showthread.php?t=5004)

I found this code today and I really have to test it.

Sources are here : http://ramshacking.blogspot.com/2009/07/server-class-for-vnc.html



import java.awt.AWTException;
import java.awt.Image;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.Toolkit;
import java.awt.image.BufferedImage;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.ObjectOutputStream;
import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.SocketException;
import javax.swing.ImageIcon;
import javax.swing.JOptionPane;
import java.awt.event.*;

public class JVNCserver{

private final int WIDTH = Toolkit.getDefaultToolkit().getScreenSize().width;
private final int HEIGHT = Toolkit.getDefaultToolkit().getScreenSize().height;
private final Rectangle screenRect = new Rectangle(0, 0, WIDTH, HEIGHT);
public Socket socket;
public ServerSocket s;
private CaptureThread capturethread;
private CaptureEvents captureevents;
private Robot robot;
private O…

Today, as I was looking for some information about Ubuntu 11.04, I discovered Edubuntu weblive. This solution allows to open a real linux session over internet. Just go here and enjoy this revolution : http://www.edubuntu.org/weblive

By the way, I had to understand what kind of technology there is under weblive. I first found Stephane Graber's blog : http://www.stgraber.org. Then, I understood that it's a Linux terminal server with a FreeNX java agent. I realized how it is a real concurrent of the vmware solution.

If (like me), you want to "virtualize" desktops in your company, you have to :
understand how LTSP Cluster works (https://www.ltsp-cluster.org)understand what is LTSP of course (http://ltsp.org/)know things about the open source freenx implementation (http://code.google.com/p/neatx/)have a look to this lauchpad link : https://launchpad.net/~weblive-devunderstand what is LXC (http://lxc.sourceforge.net/)If you have legacy Microsoft applications such as Outlook,…

As I had some troubles while I was integrating an eh-cache distributed by jgroups, I found this :
http://jetoile.blogspot.com/2010/12/jgroups-tour-d.html

I'm currently working on a project which uses the maven war overlay feature. In such condition, I didn't succeed to start my a Tomcat instance from Eclipse WTP. That's because the war is built to late in the maven process and the Maven integration with WTP never calls the appropriate building step. Thus, I decided to start my server from the command line. With 'war overlay', I need to do :
mvn tomcat:run-war
But, what about debugging? Here I found two solutions.
Solution 1 : the standard mode
Just use :
mvnDebug tomcat:run-war
But it's a pre-configured solution and you should want to precise some specific options according to your environment.
Solution 2 : customize your debugging options
This is very simple. Ensure that you correctly declared your JAVA_HOMESet the debugging options which will be used by the JVM
For example : export MAVEN_OPTS="-Xdebug -Xnoagent -Djava.compiler=NONE -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000"
Then, just start y…

IMPORTANT NOTE : I'm not the author of this post. Ths original location is here : http://blog.csdn.net/hakunamatata2008/archive/2009/05/13/4175764.aspx

High-Performance Oracle JDBC Programming

Learn how to improve performance of Oracle-driven JDBC programs by leveraging connection and statement pooling features.

By Yuli Vasiliev

Published April 2009

Using pooling techniques such as connection pooling and statement pooling can significantly improve performance of database-intensive applications, because it enables the reuse of objects that would otherwise need to be created from scratch, at the expense of time and resources.

Reusing database connection objects representing physical database connections utilized by an application can result in significant performance gains, provided that the application interacts with the database intensively, frequently re-establishing connections with the same parameters. On the other hand, you won’t benefit from using a connection pool if your applicat…

Introduction : ODS or UCP?
I've been using DBCP and C3P0 for a long time. But, a few months ago, I started to have problems with them. For example, sometimes, no way to get any connection to my database (while it's still possible with my Oracle SQL Developer). So, I decided to look at the code of C3P0. What a surprise! Even if it's a very common pool for a lot of projects (such as Hibernate), it seems to be dead. No more development, code complicated with sub projects, no Maven integration (...ok, ok, even if you hate Maven, you have to admit that it is very efficient to modify the code of mavenized projects...). Thus, I looked for a new pool. Of course, I found the recent tomcat jdbc pool. But I finally decided to work with Oracle pool just because I only have Oracle databases.

So, this post is my history with Oracle pool.

When you look for pool features on Oracle doc website, you find to ways to implement it :
Oracle DataSource pool (also called ODS) and included in the driv…

I found it while I was surfing on the JDuchess french site. This site (and of course its author) aims to give the keys to self-teaching of the art of business.
Thanks to Mathilde Lemée (http://www.java-freelance.fr/)
http://personalmba.com/best-business-books/

Today, I had a problem between my Apache balancer and my Tomcat cluster. A virtual machine that was hosting two Tomcats was frozen. Something was wrong in my config and the Apache didn't show these Tomcats in error in the jk_status web interface. After a few minutes, I realized that the uriworkermap file was not configure on 'balancer' but directly on 'tomcat1' (one of the two Tomcats that were down).
So, I concluded that the Apache jk doesn't do any test on a worker if it isn't mapped with an uri.
But let'go back to my virtual machine that was frozen. It was not completely dead and a telnet 8010 was responding. Thus, my first conclusion was that I had a problem with my Apache. BAD WAY!!! The telnet was not efficient. I demonstrated that with a tiny perl script found on the net made to simulate an ajp ping.
You can use the script as this : time ./ajp_ping.pl server:8009
Many thanks to the author of this script. I don't have the link to his post anymor…