@Bean
public BeanPostProcessor beanPostProcessor() {
    return new BeanPostProcessor() {
        @Override
        public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
            return bean;
        }

        @Override
        public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
            if (bean instanceof RequestMappingHandlerAdapter) {
                RequestMappingHandlerAdapter adapter = (RequestMappingHandlerAdapter) bean;
                List<HandlerMethodArgumentResolver> argumentResolvers = new ArrayList<HandlerMethodArgumentResolver>(adapter.getArgumentResolvers());
                argumentResolvers.add(0, myCustomArgumentResolver);
                adapter.setArgumentResolvers(argumentResolvers);
            }

            return bean;
        }
    };
}