PrimeFaces: conditional update on validation

Question

Is it possible to conditionally update JSF components only when validation succeeds?

I would like to be able to do something like

Answer 1

The (or PrimeFaces' counterpart ) is intented for this. Or, in your case maybe better, the (or ).

public void submit() {
    // ...

    if (fail) {
        FacesContext.getCurrentInstance().addMessage(null, 
            new FacesMessage(FacesMessage.SEVERITY_ERROR, "Fail", null));
    }
}

with

Note that you're as well supposed to use a normal Validator implementation to perform the validation. If it throws a ValidatorException, then the action won't be invoked anyway. Doing validation inside action method is a smell.