/** Check user input can build a {@link Register} object. */
protected void validateUserInput() {
try {
ModelFromRequest builder = new ModelFromRequest(getRequestParser());
String ipAddress = getRequestParser().getRequest().getRemoteAddr();
fRegister = builder.build(
Register.class,
LOGINNAME, SCREENNAME, PASSWORD, PASSWORDCONFIRM,
EMAIL, CAPTCHA_CHALLENGE, CAPTCHA_RESPONSE, Id.from(ipAddress)
);
}