Many thanks, just a few more questions :
I am running 2.6.22 linux kernel ( a light one, recompiled without a lot of unnecessary bits). This works perfect in a network standpoint (Apache/Tomcat).
I have installed the arduini soft and driver and I can see the Arduino board. Is that driver enough our shall I use another one ?
In fact, once I have the USB/Serial driver installed, can't I use the java.io API to send command directly to the /dev/TTYsx interface instead of the JNI + Low level C driver ? (A bit like the serial monitor of the arduino software does).
In this case, I can send value to the arduino board from my JSP pages and I need to update the arduino sketch to send all the needed values to the Linux driver.
Many thanks