Java config for spring interceptor where interceptor is using autowired spring beans

Just do the following:

@EnableWebMvc
@Configuration
public class WebConfig extends WebMvcConfigurerAdapter {

    @Bean
    LocaleInterceptor localInterceptor() {
         return new LocalInterceptor();
    }

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

}

Of course LocaleInterceptor needs to be configured as a Spring bean somewhere (XML, Java Config or using annotations) in order for the relevant field of WebConfig to get injected.

The documentation for general customization of Spring’s MVC configuration can be found here, and specifically for Interceptors see this section