Etat HTTP 404 -

Bonjour tout le monde..
Je travaille sur une application J2EE, avec struts1, je viens de commencer malgré ça j'ai eu l'erreur Etat HTTP 404 -
voila mon fichier web.xml
<?xml version="1.0" encoding="ISO-8859-1"?>

<!DOCTYPE web-app PUBLIC
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://www.oracle.com/webfolder/technetwork/jsc/dtd/web-app_2_3.dtd">

<web-app>
<display-name>Struts Blank Application</display-name>

<!-- Standard Action Servlet Configuration -->
<servlet>
<servlet-name>action</servlet-name>
<servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
<init-param>
<param-name>config</param-name>
<param-value>/WEB-INF/struts-config.xml</param-value>
</init-param>
<load-on-startup>2</load-on-startup>
</servlet>
<servlet>
<servlet-name>action</servlet-name>
<servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
<init-param>
<param-name>config</param-name>
<param-value>/WEB-INF/struts-config.xml</param-value>
</init-param>
<load-on-startup>2</load-on-startup>
</servlet>

<!-- Standard Action Servlet Mapping -->
<servlet-mapping>
<servlet-name>action</servlet-name>
<url-pattern>/saisiroffre</url-pattern>
</servlet-mapping>

<servlet-mapping>
<servlet-name>action</servlet-name>
<url-pattern>/SaisirEtudiant</url-pattern>
</servlet-mapping>
<!-- The Usual Welcome File List -->
<welcome-file-list>
<welcome-file>/pages/acceuil.html</welcome-file>

</welcome-file-list>

<taglib>
<taglib-uri>
/WEB-INF/struts-bean.tld
</taglib-uri>
<taglib-location>
/WEB-INF/struts-bean.tld
</taglib-location>
</taglib>
<taglib>
<taglib-uri>
/WEB-INF/struts-html.tld
</taglib-uri>
<taglib-location>
/WEB-INF/struts-html.tld
</taglib-location>
</taglib>
<taglib>
<taglib-uri>
/WEB-INF/struts-logic.tld
</taglib-uri>
<taglib-location>
/WEB-INF/struts-logic.tld
</taglib-location>
</taglib>
<taglib>
<taglib-uri>
/WEB-INF/struts-template.tld
</taglib-uri>
<taglib-location>
/WEB-INF/struts-template.tld
</taglib-location>
</taglib>

</web-app>

et voila mon fichier struts-config.xml

<?xml version="1.0" encoding="ISO-8859-1" ?>

<!DOCTYPE struts-config PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 1.3//EN"
"http://struts.apache.org/dtds/struts-config_1_3.dtd">
<struts-config>

<!-- ================================================ Form Bean Definitions -->

<form-beans>

<form-bean name="form_offre" type="inseastages.attributs.AttributsForm">

<form-property
name="entreprise"
type="java.lang.String"/>

<form-property
name="theme"
type="java.lang.String"/>

<form-property
name="adresse"
type="java.lang.String"/>

<form-property
name="telephone"
type="java.lang.String"/>

<form-property
name="mail"
type="java.lang.String"/>

<form-property
name="faxe"
type="java.lang.String"/>

<form-property
name="nbretudiant"
type="java.lang.int"/>

</form-bean>
<form-bean name="form_inscription" type="inseastages.attributs.EtudiantForm">

<form-property
name="cin"
type="java.lang.String"/>

<form-property
name="nom"
type="java.lang.String"/>

<form-property
name="prenom"
type="java.lang.String"/>

<form-property
name="mail"
type="java.lang.String"/>

<form-property
name="mail"
type="java.lang.String"/>

<form-property
name="telephone"
type="java.lang.String"/>

<form-property
name="departement"
type="java.lang.string"/>

</form-bean>

</form-beans>
<action-mappings>
<!-- Default "Welcome" action -->
<!-- Forwards to Welcome.jsp -->
<action
path="/Welcome"
forward="/pages/Authentification/Authentifier.jsp"/>

<action
path="/saisiroffre"
type="inseastages.Offres.SaisiOffre"
name="form_offre"
scope="request"
attribute="log"
validate="false"
input="/pages/offres/SaisiOffre">

<forward
name="yes"
path="/pages/offres/AddOffreSucces.jsp"/>

<forward
name="no"
path="/pages/offres/AddOffreEchec.jsp"/>

</action>
<action
path="/SaisirEtudiant"
type="inseastages.Etudiants.SaisiEtudiant"
name="form_inscription"
scope="request"
attribute="log"
validate="false"
input="/pages/Etudiants/SaisiEtudiant">

<forward
name="yes"
path="/pages/Etudiants/AddetudiantSucces.jsp"/>

<forward
name="no"
path="/pages/Etudiants/AddetudiantEchec.jsp"/>

</action>

de l'aide SVP