JSF setting bean fields without overring values.

Question

Imagine I have two <h:inputText> components:
One is a SSN (Social Security Number) inputText and the other one is a Name component.
I have put a onValueChangeListener on my SSN inputText for when its value changes.
When it changes, I call a Business Method which accesses a DAO and retrieves the person's Name from a DAtabase.
on the onValueChangeListener method I set: beanName.setName(XXDAO.findXXXBySSN(ssn)).getName())
something like that...
the problem lies in the Update Values Phase because all the values I set in the Listener method are overriden by the Update Values PHase. They get set with the old form values and all the processing I do is worth nothing...
Any help???

Answer 1

Yeh its a problem because the value changed is called before the model update.
So what you can do
you can update the variables yourself then call
FacesContext.getCurrentInstance().renderResponse();
in your value change this will skip the model update
(note i have found a problem with the view not refreshing with this still unresolved problem i have a post ongoing about this)
with renderResponse you can also make a navigation rule to navigate back to the same page and call it in your value changed method.
FacesContext.getCurrentInstance().getApplication().getNavigationHandler().handleNavigation(FacesContext.getCurrentInstance(),null,"test");
where test is the navigation rule
this will force the view to be updated
The other soultion i found to this was to move the value changed event to the model update phase. This way your setters are called before yoru value changed event
something like
public void changeMethod(ValueChangeEvent event)
PhaseId phaseId = event.getPhaseId();
String oldValue = (String) event.getOldValue();
String newValue = (String) event.getNewValue();
if (phaseId.equals(PhaseId.ANY_PHASE))
event.setPhaseId(PhaseId.UPDATE_MODEL_VALUES);
event.queue();
// correct phase update local variables for the new class Number
else if (phaseId.equals(PhaseId.UPDATE_MODEL_VALUES))
}