What is differnce between following to getting the Application Module ?

Question

1-
    public static SimpleAM  getSimpleAM() {
        DCBindingContainer bindingContainer =
            (DCBindingContainer)BindingContext.getCurrent().getCurrentBindingsEntry();
        SimpleAM  simpleAM  =
            (SimpleAM  )bindingContainer.getDataControl().getDataProvider();
        return SimpleAM  ;
    }2-
   public SimpleAM  getApplicationModule() {
        FacesContext context = FacesContext.getCurrentInstance();
        ValueBinding vb =
            context.getApplication().createValueBinding("#{data}");
        BindingContext bc = (BindingContext)vb.getValue(context);
        DCDataControl dc = bc.findDataControl("SimpleAMDataControl");
        return (SimpleAM )dc.getDataProvider();
    }The first one giving ClassCostException why ?
In Some case it is working fine.
My question which one is correct to get the AM and why ?

Answer 1

One more doubts,
I added Client method in the page binding.i want to know,Each page has one page def .Page def is representing binding for that particular page.When we request any page at that time the container going to create the Binding object.User will be able to access the all attribute of binding.
My question is that ,At that time Binding container will represent only one Binding Object ?If user click any other pages then the previous Binding Object will lost ?
Or is there any Global Binding Object,Where i can add any method that will access through whole project.
Thanks