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很多人吐槽 Spring Security 比 Shiro 重量级，这个重量级不是凭空来的，重量有重量的好处，就是它提供了更为强大的防护功能。

protected final UserDetails retrieveUser(String username,
    UsernamePasswordAuthenticationToken authentication)
    throws AuthenticationException {
  prepareTimingAttackProtection();
  try {
    UserDetails loadedUser = this.getUserDetailsService().loadUserByUsername(username);
    if (loadedUser == null) {
      throw new InternalAuthenticationServiceException(
          "UserDetailsService returned null, which is an interface contract violation");
    }
    return loadedUser;
  }
  catch (UsernameNotFoundException ex) {
    mitigateAgainstTimingAttack(authentication);
    throw ex;
  }
  catch (InternalAuthenticationServiceException ex) {
    throw ex;
  }
  catch (Exception ex) {
    throw new InternalAuthenticationServiceException(ex.getMessage(), ex);
  }
}