title: Tomcat gives 404 when i call my servlet
body: <p>I can't access to my servlet i call with a form. I checked the arborescence, web.xml and the form, but i can't see any problem. I use Eclipse with a "web dynamic project".</p>
  
  <p>There is my arborescence :</p>
  
  <p><img src="https://i.stack.imgur.com/nyRnp.jpg" alt="enter image description here"></p>
  
  <p>My web.xml :</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5"&gt;
  &lt;display-name&gt;Z-ProjetJ2EE&lt;/display-name&gt;
  &lt;welcome-file-list&gt;
    &lt;welcome-file&gt;index.html&lt;/welcome-file&gt;
  &lt;/welcome-file-list&gt;
  &lt;servlet&gt;
    &lt;description&gt;&lt;/description&gt;
    &lt;servlet-name&gt;CommandeServlet&lt;/servlet-name&gt;
    &lt;servlet-class&gt;controleur.CommandeServlet&lt;/servlet-class&gt;
  &lt;/servlet&gt;
  &lt;servlet-mapping&gt;
    &lt;servlet-name&gt;CommandeServlet&lt;/servlet-name&gt;
    &lt;url-pattern&gt;/urlCommandeServ&lt;/url-pattern&gt;
  &lt;/servlet-mapping&gt;
  &lt;/web-app&gt;
  </code></pre>
  
  <p>My form (i tried the complete url, but it didn't works) :</p>
  
  <pre><code>&lt;form action="/urlCommandeServ" method="post"&gt;
  </code></pre>
  
  <p>And my servlet :</p>
  
  <pre><code>protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
      String cat = request.getParameter("categorie");
      Float prix = Float.parseFloat(request.getParameter("prix"));
      response.sendRedirect("CreerCommande?cat=" + cat+"&amp;prix="+prix);
  </code></pre>
  
  <p>I didn't have any error in eclipse, and the log folder in tomcat is empty. Could you help me ?</p>
  
  <p>EDIT:</p>
  
  <p>There is my error :</p>
  
  <p><img src="https://i.stack.imgur.com/gtWNe.jpg" alt="Error 404"></p>
  
  <p>I agree for responses about my error on response.sendRedirect, but this is not the real subject of my error :) Even if i erase all of my code on doPost, i have this error, instead of a white page.</p>