Question

I changed my static menu file (header.xhtml) with a mega menu with a model.
Like this:

          <p:megaMenu model="#{menuController.megaModel}" autoDisplay="false" styleClass="menu-bar"  >

          </p:megaMenu>

So far so good, its working great and building just like I expected.
The problem is, on my form pages, when validation fails for the secound time…
I get this error:

 javax.faces.FacesException: Cannot remove the same component twice: j_idt15:j_id2     com.sun.faces.context.StateContext$AddRemoveListener.handleAddRemoveWithAutoPrune(StateContext.java:493)
        com.sun.faces.context.StateContext$AddRemoveListener.handleRemove(StateContext.java:372)

Looking at the generated HTML I cant find this String “j_idt15:j_id2”, but I can find:

   <div id="j_idt14:j_idt15" class="ui-menu ui-menubar ui-megamenu ui-widget ui-widget-content ui-corner-all ui-helper-clearfix menu-bar" role="menubar">

and this:

So… I really don´t understand. My MenuController is a sessionBean:

@Component
@Scope("session")
public class MenuController implements Serializable {

@PostConstruct
   public void init(){
   todosModulos = moduloService.findAll();
   modulosAcesso = extrairModulos();
   createMegaMenu();
}

…So.. some notes:

I figured out that this error occurs on versions of Mojarra above 2.1.9.
(I am using 2.1.10). So one possible solution is changing the JSF imp to My Faces.
I Tried that, but it buged my structure (my composite components stoped working and dynaForm also).

I tried some workarounds but no sucess. This is what I tried:
Overriding AbstractMenu and Marlon Patrick’s solution (PT-BR).

Simply doesn´t work =[

EDIT -> Creating the MenuItem

 MenuItem anItem = new MenuItem();
 anItem.setOutcome(item.getOutcome());
 anItem.setValue(item.getRotulo());
 anItem.setIcon(item.getIcone());       

Answer 1

From what I saw you already tried my two workarounds: overwrite AbstractMenu and put PhaseListener.

Well, what I realize is that the component that was the problem I had MenuBar and what you are trying to use is the MegaMenu, perhaps the solutions that I do not work for MegaMenu, although I believe that should work yes.

What I would say to you is to check the following:

1 – When you override the class AbstractMenu you are sure the PrimeFaces started to use it? To make sure it puts a break point there and if he sees to the execution flow. If you do not stop, because PrimeFaces is still using its own class.

2 – When attempting to use the solution with PhaseListener, which I prefer and use today, you noted that you need to replace a piece of code with your own code? Basically you’ll have to remove only the actions of menu items that are links, because they are causing this problem. The menu items are actions that should remain. In my case, I knew what actions were or links by ID, then you will have to differentiate somehow believe that by also id. Also, put a break point to make sure that your PhaseListener was duly registered and that is intercepting the flow of execution.