java - ADF - How do I cancel an action from a commandbutton? -

i need able cancel navigation action method on commandbutton if validation fails? how cancel action?

currently, app notifies user of failed validation, navigation still continues next page.

use both actionlistener , action, described in blog: http://andrejusb.blogspot.co.uk/2011/10/how-to-disable-action-conditionally.html