All the colors of Java and so on

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…

I n my company, I have to deal with many Spring based applications deployed on a Tomcat cluster. For each one, we set a property 'webapprootkey' in the web.xml file to avoid errors on startup. Today, I decided to dig about that (... erratum... I decided to tell Google to dig about that). Thus, I found this excellent post.

http://groups.google.com/group/riotfamily/browse_thread/thread/9a0edf69575d3ab6?pli=1

Hi all,

when deploying two applications build from the riot skeleton within the same Tomcat servlet container, you get an IllegalStateException: Web app root system property already set to different value: 'webapp.root' = [/Users/joe/Workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/webapps/webapp-A/] instead of [/Users/joe/Workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/webapps/webapp-B/] - Choose unique values for the 'webAppRootKey' context-param in your web.xml files!

I will try to explain where this comes from and how …