JBossDeveloper

I needed to do something similar.  Instead of clearing the facesMessages, I just suppressed the addition of the messages in the first place.  That is, I added a boolean field isSuppressMessages to my Home class.  Then I overrode the method from the Home class, like this

@Override
protected void updatedMessage() {
     if (!isSuppressMessages) {
          super.updatedMessage();
     }
}

This way, I can setSuppressMessages(true) before I start some work with the appropriate Home instance.  None of those changes will generate the normal EntityHome updated/created/deleted messages.  When I'm done, I call setSuppressMessages(false). 

I put that logic in a class MyEntityHome<E> extends EntityHome<E>.  Then, all of my Home classes subclass MyEntityHome, and I can use this technique on any of my Home instances.