If you'd like to have your FeedbackPanel update with errors in the event of a problem with your form, just adding the FeedbackPanel won't do you any good. Just as with any other AJAX-updating component in Wicket, you'll need to add it to the AjaxRequestTarget, only difference is, you'll have to do this while overriding onError like so:
Using FeedbackPanel with AJAX
If you'd like to have your FeedbackPanel update with errors in the event of a problem with your form, just adding the FeedbackPanel won't do you any good. Just as with any other AJAX-updating component in Wicket, you'll need to add it to the AjaxRequestTarget, only difference is, you'll have to do this while overriding onError like so: