SpringBoot配置拦截器时，始终报错：

cannot be cast to org.springframework.web.accept.ContentNegotiationManager

启动入口：

@EnableAutoConfiguration
@SpringBootApplication
@ImportResource("classpath:application-mvc.xml")
public class DemoApplication {public static void main(String[] args) {SpringApplication.run(DemoApplication.class, args);}@Beanpublic ServletRegistrationBean dispatcherRegistration(DispatcherServlet dispatcherServlet) {ServletRegistrationBean registration = new ServletRegistrationBean(dispatcherServlet);registration.addUrlMappings("*.do", "*.go");return registration;}
}

Interceptor：

public class CustomSSOSpringInterceptor implements HandlerInterceptor {@Overridepublic boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {System.out.println();return true;}@Overridepublic void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {}}

配置拦截器：

@Configuration
public class WebMvcConfig extends WebMvcConfigurationSupport {@Overridepublic void addInterceptors(InterceptorRegistry registry) {registry.addInterceptor(new CustomSSOSpringInterceptor()).addPathPatterns("/**");}
}

没有问题啊？可是始终报错，网上找了很多资料，都没有一个具体的说法，最后在一个小回复里看到了报错的原因：

http://forum.spring.io/forum/spring-projects/web/124660-spring-3-2-classcastexception-contentnegotiationmanagerfactorybean

I finally found the error, I was including a xml-config with <mvc:annotation-driven/>... I removed this, now it works

原来是我在application.xml文件里面配置了如下东西：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc"xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsdhttp://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.1.xsd"default-autowire="byName"> <mvc:annotation-driven/><bean class="com.ahoi.demo.common.interceptor.ControllerClassNameHandlerMapping"></bean></beans>

注释掉就可以了！