Why ViewRoot.getComponent(clientId) return null?

[Dave]

In a PhaseListener, first get all the clientId(s) with queued messages, then try to find the components. But ViewRoot.findComponent(clientId) return null.

 

public void beforePhase(PhaseEvent event) {

    FacesContext context = event.getFacesContext();
    UIViewRoot root = context.getViewRoot();
    Iterator<String> itr = context.getClientIdsWithMessages();
    while (itr.hasNext()) {
      String clientId = itr.next();
      UIComponent component = root.findComponent(clientId);

      // ERROR: component is null

      ....

    }

}

 

Thanks for ideas.

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