<a:support event="onchange, onsubmit" ajaxSingle="true"
action="#{customerSession.userCheckQuantity(_cartItem, index)}"
reRender="shoppingCartAjax, orderTotalAjax"></a:support>

<h:selectOneMenu id="planets" value="#{planetsMoons.currentPlanet}" valueChangeListener="#{planetsMoons.planetChanged}">
    <f:selectItems value="#{planetsMoons.planetsList}" />
    <a4j:support event="onchange" reRender="id1,id2" />
    <a4j:support event="onkeyup" reRender="id1,id3" />
</h:selectOneMenu>

<a4j:actionparam name="n" value=""  assignTo="#{userBean.name}" />

            <a4j:actionparam name="j" value=""  assignTo="#{userBean.job}" />