@Override
protected void onSubmit(AjaxRequestTarget target, Form<?> form) {
if (!started) {
started = true;
bar.start(target);
final String userName = getUsername();
if (getMaxTweets() > 0) {
grabber.setUserName(userName);
grabber.setTweetsCount(getMaxTweets());
grabber.setTwitterSearch(getTwitterSearch());