Remove @EnableWebMvc annotation.

"If you want to keep Spring Boot MVC features, and you just want to add additional MVC configuration
(interceptors, formatters, view controllers etc.) you can add your own @bean of type
WebMvcConfigurerAdapter, but without @EnableWebMvc."

@see http://docs.spring.io/spring-boot/docs/1.2.3.RELEASE/reference/htmlsingle/#boot-features-spring-mvc-auto-configuration

Author: php-coder

src/main/java/ru/mystamps/web/config/MvcConfig.java

@@ -32,7 +32,6 @@
 import org.springframework.validation.Validator;
 import org.springframework.web.method.support.HandlerMethodArgumentResolver;
 import org.springframework.web.servlet.config.annotation.DefaultServletHandlerConfigurer;
-import org.springframework.web.servlet.config.annotation.EnableWebMvc;
 import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
 import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
 import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
@@ -42,7 +41,6 @@
 import ru.mystamps.web.support.spring.security.UserArgumentResolver;
 
 @Configuration
-@EnableWebMvc
 @EnableScheduling
 @Import(ControllersConfig.class)
 public class MvcConfig extends WebMvcConfigurerAdapter {