Premier exemple Spring + hibernate + JSF _ Problème d"instanciation de service NullPointerException

Bonjour Tout le monde, ça fait une semaine que je suis bloquée dans une étape qui me sembbe banale, c'est pour cette raison que je poste ici en demandant votre aide.
en fait je crée mon premier projet web hibernate + spring + jsf en utilisant les annotations et là c'est un tout petit exemple avec une seule entité "Process" et un service qui est sensé afficher toutes mes enregistrements dans la base (après avoir vu une erreur qui s'affiche à mon écran en indiquant que mon service est null, j'ai fait un retour null dans le dao juste pour cadrer le problème et avancer petit à petit)

L'erreur qui s'affiche est :
Etat HTTP 500 -

type Rapport d'exception

message

description Le serveur a rencontré une erreur interne () qui l'a empêché de satisfaire la requête.

exception

javax.servlet.ServletException: java.lang.NullPointerException
javax.faces.webapp.FacesServlet.service(FacesServlet.java:325)
org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:206)
org.ajax4jsf.webapp.BaseFilter.handleRequest(BaseFilter.java:290)
org.ajax4jsf.webapp.BaseFilter.processUploadsAndHandleRequest(BaseFilter.java:388)
org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:515)

cause mère

javax.faces.el.EvaluationException: java.lang.NullPointerException
javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:102)
com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
javax.faces.component.UICommand.broadcast(UICommand.java:315)
org.ajax4jsf.component.AjaxViewRoot.processEvents(AjaxViewRoot.java:329)
org.ajax4jsf.component.AjaxViewRoot.broadcastEventsForPhase(AjaxViewRoot.java:304)
org.ajax4jsf.component.AjaxViewRoot.processPhase(AjaxViewRoot.java:261)
org.ajax4jsf.component.AjaxViewRoot.processApplication(AjaxViewRoot.java:474)
com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:82)
com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
javax.faces.webapp.FacesServlet.service(FacesServlet.java:312)
org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:206)
org.ajax4jsf.webapp.BaseFilter.handleRequest(BaseFilter.java:290)
org.ajax4jsf.webapp.BaseFilter.processUploadsAndHandleRequest(BaseFilter.java:388)
org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:515)

cause mère

java.lang.NullPointerException
fr.arbo.beans.ProcessBean.afficher(ProcessBean.java:55)

Voici mon code
web.xml

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<?xml version="1.0" encoding="UTF-8"?>
<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">
 
    <display-name>arbo</display-name>
 
 
 
    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>
 
 
 
 
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <listener>
        <listener-class>org.springframework.web.context.request.RequestContextListener</listener-class>
    </listener>
 
 
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>
            /WEB-INF/spring/applicationContext.xml
        </param-value>
    </context-param>
 
<context-param>  
     <param-name>javax.faces.DISABLE_FACELET_JSF_VIEWHANDLER</param-name>  
     <param-value>true</param-value>  
</context-param> 
 
 
  <servlet>
        <servlet-name>Faces Servlet</servlet-name>
        <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
 
 
    <context-param>
        <param-name>javax.faces.STATE_SAVING_METHOD</param-name>
        <param-value>client</param-value>
    </context-param>
 
 
<servlet-mapping>
   <servlet-name>Faces Servlet</servlet-name>
   <url-pattern>*.jsf</url-pattern>
</servlet-mapping>
 
 
<servlet-mapping>
   <servlet-name>Faces Servlet</servlet-name>
   <url-pattern>/faces/*</url-pattern>
</servlet-mapping>
 
  
<servlet-mapping>
   <servlet-name>Faces Servlet</servlet-name>
   <url-pattern>*.jsf</url-pattern>
</servlet-mapping>
  
    <filter>
    <filter-name>RichFaces Filter</filter-name>
<filter-class>org.ajax4jsf.Filter</filter-class>    
    </filter>
    
    
    <filter-mapping>
    <filter-name>RichFaces Filter</filter-name>
    <servlet-name>Faces Servlet</servlet-name>
    </filter-mapping>
    
    
</web-app>

faces-config.xml

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<?xml version="1.0" encoding="UTF-8"?>
<faces-config xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
    http://java.sun.com/xml/ns/javaee/web-facesconfig_2_0.xsd"
    version="2.0">
 
 
 
    <application>
    <el-resolver>org.springframework.web.jsf.el.SpringBeanFacesELResolver</el-resolver>
    </application>
 
 
    <application>   
      <view-handler>org.ajax4jsf.application.AjaxViewHandler</view-handler>
     </application>
 
 
    <application>
    <locale-config>
      <default-locale>fr</default-locale>
    </locale-config>
  </application>
 
 
 
    <managed-bean>
        <managed-bean-name>processBean</managed-bean-name>
        <managed-bean-class>fr.arbo.beans.ProcessBean</managed-bean-class>
        <managed-bean-scope>request</managed-bean-scope>
    </managed-bean>
 
 
 
<navigation-rule>
<from-view-id>/index.jsp</from-view-id>
</navigation-rule>
 
  </faces-config>

applicationContext.xml

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<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
    xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:task="http://www.springframework.org/schema/task"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
                          http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.0.xsd
                          http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
                          http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
                          http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
                          http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.0.xsd
                          http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
                          http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-3.0.xsd"
 
    xmlns:jee="http://www.springframework.org/schema/jee" xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:mvc="http://www.springframework.org/schema/mvc">
 
    <!-- config file -->
    <bean id="placeholderConfig"
        class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="location" value="WEB-INF/conf/conf.properties" />
    </bean>
 
 
    <!-- data source access -->
    <bean id="dataSource"
        class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName">
            <value>${jdbc.driverClassName}</value>
        </property>
        <property name="url">
            <value>${jdbc.url}</value>
        </property>
        <property name="username">
            <value>${jdbc.username}</value>
        </property>
        <property name="password">
            <value>${jdbc.password}</value>
        </property>
    </bean>
 
 
    <bean id="sessionFactory"
        class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.dialect">${jdbc.dialect}</prop>
                <prop key="hibernate.show_sql">false</prop>
                <prop key="hibernate.cglib.use_reflection_optimizer">false</prop>
            </props>
        </property>
 
    </bean>
 
  <!-- Hibernate transaction manager-->
        <bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
        <property name="sessionFactory" ref="sessionFactory">
 
        </property>
        </bean>
 
        <bean id="hibernateInterceptor"
            class="org.springframework.orm.hibernate3.HibernateInterceptor">
        <property name="sessionFactory">
          <ref bean="sessionFactory"/>
        </property>
      </bean>      
 
    <bean id="processDao" class="fr.arbo.dao.hibernate.ProcessDaoImpl">
    </bean>
 
 
<tx:annotation-driven transaction-manager="transactionManager"/>
<context:annotation-config/>
<context:component-scan base-package="fr.arbo"/>
 
 
</beans>

ProcessDao.java

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package fr.arbo.dao;
 
import java.util.Date;
import java.util.List;
import fr.arbo.entity.Process;
 
import fr.arbo.entity.Process;
 
public interface ProcessDao{
    public List<Process> findAll();
}

ProcessDaoImpl.java

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package fr.arbo.dao.hibernate;
 
import java.util.List;
 
import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.orm.hibernate3.HibernateTemplate;
import org.springframework.orm.hibernate3.support.HibernateDaoSupport;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Transactional;
 
 
import fr.arbo.dao.ProcessDao;
import fr.arbo.entity.Process;
 
 
public class ProcessDaoImpl implements ProcessDao {
 
 
    @Override
    public List<Process> findAll() {
        return null; 
    }
 
 
 
}

ProcessService.java

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package fr.arbo.service;
 
import java.util.List;
 
import fr.arbo.entity.Process;
 
public interface ProcessService {
    public List<Process> findAll();
}

ProcessServiceImpl.java

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package fr.arbo.service;
 
import java.util.List;
 
import fr.arbo.entity.Process;
 
public interface ProcessService {
    public List<Process> findAll();
}

et finalement ProcessBean.java

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package fr.arbo.beans;

import java.io.Serializable;
import fr.arbo.entity.*;
import fr.arbo.entity.Process;

import java.util.List;
import java.util.ArrayList;

import javax.annotation.PostConstruct;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;

import org.hibernate.mapping.Array;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Component;


import fr.arbo.service.ProcessService;


@ManagedBean(name="processBean")
@Scope("session")
public class ProcessBean implements Serializable {
    
    /**
     * 
     */
    private static final long serialVersionUID = 1L;

    @Autowired
    private transient ProcessService ps;
    
    List<Process> maListe =  new ArrayList<Process>(); 
    
    @PostConstruct
    public void init() {
        System.out.println("init");
        maListe = new ArrayList<Process>(); 
    }

    
    
    public ProcessBean(){
        System.out.println("test");
    }
    
    
    
    
    public void afficher(){
    System.out.println(" =====>> methode afficher <<=====");
    
    maListe = ps.findAll(); 

    }

    public List<Process> getMaListe() {
        return maListe;
    }

    public void setMaListe(List<Process> maListe) {
        this.maListe = maListe;
    }


    public ProcessService getPs() {
        return ps;
    }





    public void setPs(ProcessService ps) {
        this.ps = ps;
    }






}

MA page jsf :

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 
<%@taglib uri="http://java.sun.com/jsf/core" prefix="f"%> 
<%@taglib uri="http://java.sun.com/jsf/html" prefix="h"%> 
<%@taglib uri="http://richfaces.org/rich" prefix="rich"%>
<%@taglib uri="http://richfaces.org/a4j" prefix="a4j"%>
<html>
<body>
<p>Mon premier exemple</p>
<f:view>
<h:form>
<h:outputText value="Appeler la methode afficher" />
<h:commandLink value="Lien" action="#{processBean.afficher}" >
</h:commandLink>
</h:form>
</f:view>
</body> 
</html>

Merci d'avance