retrieving of uri parameters with scaladin

General
1

hello
I would like to manage uri parameters using scaladin & eclipse.
here is my code[code]
package com.example.scaladinchat

import vaadin.scala.UI
import vaadin.scala.VerticalLayout
import vaadin.scala.Label
import vaadin.scala.server.ScaladinRequest

class N02Parameters extends UI { app =>

override def init(request: ScaladinRequest) {
content = new VerticalLayout {

  add(Label("URI : "+request.getParameter("abc").getOrElse("inconnu")))
}

}

}
[/code]but with this uri : http://localhost:8080/N02/?abc=salut, I get this error : Failed to load the bootstrap javascript: ./…/VAADIN/vaadinBootstrap.js.
can you help me?
ps: here is part of my web.xml :

N02
vaadin.scala.server.ScaladinServlet

ScaladinUI
com.example.scaladinchat.N02Parameters



N02
/N02/*

thanks.