Find all beans referenced on a JSF page for PhaseListener

Question

I am trying to implement a PhaseListener to do some application specific stuff just before the render response phase. I am trying to find all of the managed beans referenced in the currently executing JSF page. So for example, if I had this in a page:
<h:selectOneListBox id="foo" value="#{foo.bar}">
  <f:selectItems value="#{bazz.list}"/>
</h:selectOneListBox>I would want to be able to locate both the beans "foo" and "bazz" (both are managed beans) inside the PhaseListener without using their names (unless I can first discover all the names referenced on the page).
Basically, I am looking for a generic way to process all managed beans that are used on a page just before the response is rendered.. Anyone have any ideas on this?

Answer 1

Do something likepublic class MyPhaseListener implements PhaseListener {
    public void beforePhase(PhaseEvent event) {
        // Do nothing.
    public void afterPhase(PhaseEvent event) {
        List children = (List) ((ArrayList) event.getFacesContext().getViewRoot().getChildren()).clone();
        List bindings = new ArrayList();
        for (Iterator iter = children.iterator(); iter.hasNext();) {
            UIComponent component = (UIComponent) iter.next();
            children.addAll(component.getChildren());
            ValueBinding binding = component.getValueBinding("value"); // Get the "value" attribute.
            if (binding != null) {
                bindings.add(binding.getExpressionString()); // Get the EL string, eg. #{myBean.value}.
        // Do your thing with the bindings.
    public PhaseId getPhaseId() {
        return PhaseId.RENDER_RESPONSE;
}