How to obtain the current language in a controller?

How to obtain the current language in a controller?

Here is my locale configuration
<bean id="messageSource"
class="org.springframework.context.support.ReloadableResourceBundleMessageSource">
<property name="basename" value="classpath:messages" />
<property name="defaultEncoding" value="UTF-8" />
</bean>
<bean id="localeChangeInterceptor"
class="org.springframework.web.servlet.i18n.LocaleChangeInterceptor">
<property name="paramName" value="lang" />
</bean>
<bean id="localeResolver"
class="org.springframework.web.servlet.i18n.CookieLocaleResolver">
<property name="defaultLocale" value="en"/>
</bean>
<bean id="handlerMapping"
class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping">
<property name="interceptors">
<ref bean="localeChangeInterceptor" />
</property>
</bean>
When I try to call locale in a controller using
@RequestMapping(value = "customers/customer-{idCustomer:[0-9]+}/detail",
method = RequestMethod.GET)
public ModelAndView detail(Map<String, Object> map, @PathVariable Integer
idCustomer, Locale locale) {
logger.info(locale.toString());
logger.info(request.getLocale().toString());
...
}
It returns different values. But when I switch a language on a site using
GET param in URL ?lang=en, it change nothing in mentioned controller's
calls. i18n works fine, it loads a labels from correct file. But I want to
obtain changed language in my controllers. I want to obtain choosed
language independently on opened page (with/without request param lang in
URL).