Spring Security SAML - 无法捕获UserNameNotFound异常

Question

我在SAMLUserDetailsS​​ervice中抛出了UserNameNotFound Exception。但是当用户不在DB中时，它仍会调用我的AuthenticationSuccessHandler。

你对这个问题有什么想法吗？ 这是我的loadUserBySAML方法的一部分

            String userName = nameValue.trim();
            AppUser domainUser = userRepository.findByAppUserNm(userName);

            if (domainUser == null) {
                logger.info("User is null");

                throw new UsernameNotFoundException("User is not in the DB");

            } else {
                boolean enabled = true;
                boolean accountNonExpired = true;
                boolean credentialsNonExpired = true;
                boolean accountNonLocked = true;

                return new User(domainUser.getAppUserNm(), domainUser.getAppUserPwdTxt().toLowerCase(), enabled, accountNonExpired, credentialsNonExpired,
                        accountNonLocked, getAuthorities(userName));
            }