Error 404 : Project/j_spring_security_check is not available

<h:form id="loginForm" prependId="false" >
  <label for="exampleInputEmail1">Email address</label>
<h:inputText class="form-control"  id="j_username" required="true"/>
 <label for="exampleInputPassword1">Password</label>
 <h:inputSecret  class="form-control" id="j_password" required="true"/>
   <h:commandButton  type="submit" class="btn btn-primary btn-block" action="#{authentication.doLogin()}" value="Login" />
 </h:form>

public String doLogin() throws ServletException, IOException
    {
        ExternalContext context=FacesContext.getCurrentInstance().getExternalContext();
        RequestDispatcher dispatcher=((ServletRequest)context.getRequest()).getRequestDispatcher("j_spring_security_check");
        dispatcher.forward((ServletRequest)context.getRequest(),(ServletResponse)context.getResponse());
        FacesContext.getCurrentInstance().responseComplete();
        return null;
    }

<http auto-config="true">
<intercept-url pattern="/j_spring_security_check" access="IS_AUTHENTICATED_ANONYMOUSLY"/>
<intercept-url pattern="/login.xhtml*" access="IS_AUTHENTICATED_ANONYMOUSLY" />
<intercept-url pattern="/Backoff/*" access="ROLE_USER"/>
<form-login login-page="/login.xhtml" default-target-url="/Backoff/activities.xhtml"
always-use-default-target="true"
authentication-failure-url="/Front/error.xhtml"  />
</http>