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

最新推荐文章于 2024-08-14 12:05:54 发布

转载最新推荐文章于 2024-08-14 12:05:54 发布 · 542 阅读

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原文链接：https://my.oschina.net/u/3047936/blog/1806406

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#java #测试 #python

本文解决了在Spring Boot中配置自定义拦截器时出现的类型转换异常问题。通过注释掉application.xml中<mvc:annotation-driven/>配置，成功避免了ContentNegotiationManager类型转换错误。

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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);
    }

    @Bean
    public ServletRegistrationBean dispatcherRegistration(DispatcherServlet dispatcherServlet) {
        ServletRegistrationBean registration = new ServletRegistrationBean(dispatcherServlet);
        registration.addUrlMappings("*.do", "*.go");
        return registration;
    }
}

Interceptor：

public class CustomSSOSpringInterceptor implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println();
        return true;
    }


    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {

    }

}

配置拦截器：

@Configuration
public class WebMvcConfig extends WebMvcConfigurationSupport {

    @Override
    public 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.xsd
        http://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！

转载于:https://my.oschina.net/u/3047936/blog/1806406