En jboss 7.1.1 final  with jboss 7.0.13 final, when i try to put o get a Object on session, this error is showed:

java.lang.ClassNotFoundException: org.apache.catalina.session.StandardSessionFacade from

I review and this class is presented on JBOSS_HOME/modules\org\jboss\as\web\main\jbossweb-7.0.13.Final.jar

Debug the code, the error is generated on this line of my code

JsfUtilVital.getRequest().getSession().setAttribute("xxx", true);

Where getRequest on JSFUtilVital is:

public static HttpServletRequest getRequest() {
return (HttpServletRequest) FacesContext.getCurrentInstance().getExternalContext().getRequest();
}

any idea about this error?