NullPointerException ao utilizar @Autowired

Fala galera blz ?

Seguinte: Estou recebendo um NullPointer ao tentar injetar um dao em um validator, o que será que estou fazendo de errado, seguem os códigos que estou utilizando:

Classe AppWebConfigurator

@EnableWebMvc
@ComponentScan(basePackageClasses = { HomeController.class, ProdutoDAO.class, FileSaver.class, CarrinhoCompras.class,
        UsuarioValidator.class })
@EnableCaching
@EnableAspectJAutoProxy(proxyTargetClass = true)
public class AppWebConfiguration extends WebMvcConfigurerAdapter {

    @Bean
    public InternalResourceViewResolver internalResourceViewResolver() {
        InternalResourceViewResolver resolver = new InternalResourceViewResolver();
        resolver.setPrefix("/WEB-INF/views/");
        resolver.setSuffix(".jsp");

        // resolver.setExposeContextBeansAsAttributes(true);
        resolver.setExposedContextBeanNames("carrinhoCompras");

        return resolver;
    }

    @Bean
    public MessageSource messageSource() {
        ReloadableResourceBundleMessageSource messageSource = new ReloadableResourceBundleMessageSource();
        messageSource.setBasename("/WEB-INF/messages");
        messageSource.setDefaultEncoding("UTF-8");
        messageSource.setCacheSeconds(1);
        return messageSource;
    }

    @Bean
    public FormattingConversionService mvcConversionService() {
        DefaultFormattingConversionService conversionService = new DefaultFormattingConversionService();
        DateFormatterRegistrar registrar = new DateFormatterRegistrar();
        registrar.setFormatter(new DateFormatter("dd/MM/yyyy"));
        registrar.registerFormatters(conversionService);

        return conversionService;
    }

    @Bean
    public MultipartResolver multipartResolver() {
        return new StandardServletMultipartResolver();
    }

    @Bean
    public RestTemplate restTemplate() {
        return new RestTemplate();
    }

    @Bean
    public CacheManager cacheManger() {
        CacheBuilder<Object, Object> builder = CacheBuilder.newBuilder().maximumSize(100).expireAfterAccess(5,
                TimeUnit.MINUTES);
        GuavaCacheManager manager = new GuavaCacheManager();
        manager.setCacheBuilder(builder);
        return manager; // new ConcurrentMapCacheManager();
    }

    @Bean
    public ViewResolver contentNegotiationViewResolver(ContentNegotiationManager manager) {
        List<ViewResolver> viewResolvers = new ArrayList<>();
        viewResolvers.add(internalResourceViewResolver());
        viewResolvers.add(new JsonViewResolver());

        ContentNegotiatingViewResolver resolver = new ContentNegotiatingViewResolver();
        resolver.setViewResolvers(viewResolvers);
        resolver.setContentNegotiationManager(manager);
        return resolver;
    }

    @Override
    public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
        configurer.enable();
    }

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new LocaleChangeInterceptor());
    }

    @Bean
    public LocaleResolver localeResolver() {
        return new CookieLocaleResolver();
    }

    @Bean
    public MailSender mailSender() {
        JavaMailSenderImpl mailSender = new JavaMailSenderImpl();
        mailSender.setHost("seu servidor smtp");// por exemplo smtp.gmail.com
        mailSender.setUsername("seu email");
        mailSender.setPassword("sua senha");
        mailSender.setPort(587);

        Properties mailProperties = new Properties();
        mailProperties.setProperty("mail.smtp.auth", "true");
        mailProperties.setProperty("mail.smtp.starttls.enable", "true");
        mailSender.setJavaMailProperties(mailProperties);

        return mailSender;
    }
}

Classe UsuarioValidator

@Component
public class UsuarioValidator implements Validator {

    @Autowired
    private UsuarioDAO dao;

    @Override
    public boolean supports(Class<?> clazz) {
        return Usuario.class.isAssignableFrom(clazz);
    }

    @Override
    public void validate(Object target, Errors errors) {

        ValidationUtils.rejectIfEmpty(errors, "nome", "field.required");
        ValidationUtils.rejectIfEmpty(errors, "email", "field.required");
        ValidationUtils.rejectIfEmpty(errors, "senha", "field.required");
        ValidationUtils.rejectIfEmpty(errors, "password", "field.required");

        Usuario usuario = (Usuario) target;

        if (usuario.getSenha().length() < 5) {
            errors.rejectValue("senha", "notMatch.passwordSize");
        }

        if (!usuario.getSenha().equals(usuario.getConfirmPassword())) {
            errors.rejectValue("senha", "notMatch.confirmPassword");
            errors.rejectValue("confirmPassword", "notMatch.confirmPassword");
        }

        String email = usuario.getEmail();
        if (isUser(email)) {
            System.out.println("OK");
        }

    }

    private boolean isUser(String email) {
        System.out.println("M");
        Usuario usuario = dao.loadUserByUsername(email);
        if (usuario != null) {
            return false;
        } else {
            return true;
        }
    }

}

Grato