SpringMvc4.2.5 零配置出现 No mapping found for HTTP request with URI

采用 spring 零配置，参考 http://hanqunfeng.iteye.com/blog/2113820，WebInitializer 类代码如下：

public class WebInitializer implements WebApplicationInitializer {

private static final Logger logger = LogManager.getLogger(WebInitializer.class);

@Override
public void onStartup(ServletContext servletContext) throws ServletException {

logger.info("-------->启动web应用");

/*
*  Log4jConfigListener: log4j 2日志配置，配置文件为 classpath:log4j2.xml
*/
servletContext.addListener(new Log4jServletContextListener());

Log4jServletFilter log4jServletFilter = new Log4jServletFilter();
servletContext.addFilter("log4jServletFilter", log4jServletFilter);

/*
*  OpenSessionInViewFilter: 加上该 filter 可以保证jackson能够序列化LAZY FetchType
*/
OpenSessionInViewFilter openSessionInViewFilter = new OpenSessionInViewFilter();
FilterRegistration.Dynamic openSessionInViewFilterRegistration = servletContext
.addFilter("openSessionInViewFilter", openSessionInViewFilter);
//指定在spring配置的sessionFactory
openSessionInViewFilterRegistration.setInitParameter("sessionFactoryBeanName", "sessionFactory");
//singleSession默认为true,若设为false则等于没用OpenSessionInView
openSessionInViewFilterRegistration.setInitParameter("singleSession", "true");
openSessionInViewFilterRegistration.addMappingForUrlPatterns(
EnumSet.of(DispatcherType.REQUEST, DispatcherType.FORWARD, DispatcherType.INCLUDE), false, "/");

ServerParameter params = ServerParameter.getInstance();
DBMananger.loadEnv();
if(DBMananger.connDB()) {       // 数据库连接成功，再载入APP配置
params.addAttribute("connDBSataus", true);
/*
* spring mvc 外的配置 AppConfig类
*/
AnnotationConfigWebApplicationContext rootContext = new AnnotationConfigWebApplicationContext();
rootContext.register(AppConfig.class);
servletContext.addListener(new ContextLoaderListener(rootContext));

}

/*
* spring-mvc 上下文
*/
AnnotationConfigWebApplicationContext springMvcContext = new AnnotationConfigWebApplicationContext();
//        springMvcContext.register(MvcConfig.class);

/*
* DispatcherServlet
*/
DispatcherServlet dispatcherServlet = new DispatcherServlet(springMvcContext);
ServletRegistration.Dynamic dynamic = servletContext.addServlet("dispatcherServlet", dispatcherServlet);
dynamic.setLoadOnStartup(1);
dynamic.addMapping("/");

/*
* CharacterEncodingFilter: 解决中文乱码问题
*/
CharacterEncodingFilter characterEncodingFilter = new CharacterEncodingFilter();
characterEncodingFilter.setEncoding("utf-8");
FilterRegistration characterEncodingfilterRegistration =
servletContext.addFilter("characterEncodingFilter", characterEncodingFilter);
characterEncodingfilterRegistration.addMappingForUrlPatterns(EnumSet.of(DispatcherType.REQUEST), false, "/*");
}

}

MvcConfig 配置如下：

public class MvcConfig extends WebMvcConfigurationSupport {

private static final Logger logger = LogManager.getLogger(MvcConfig.class);

/**
* 注册视图处理器
* @return
*/
@Bean
public ViewResolver viewResolver() {
logger.info("注册视图处理器-------->ViewResolver");
InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();
viewResolver.setPrefix("/jsp/");
viewResolver.setSuffix(".jsp");
return viewResolver;
}

/**
* 资源访问处理器
* 可以在jsp中使用/images/**的方式访问/images/下的内容
*/
@Override
public void addResourceHandlers(ResourceHandlerRegistry registry) {
logger.info("资源访问处理器-------->addResourceHandlers");
registry.addResourceHandler("/resources/**")
.addResourceLocations("/resources/")
.resourceChain(true).addResolver(
new VersionResourceResolver().addContentVersionStrategy("/**"));
}
}

结果出现No mapping found for HTTP request with URI警告，访问静态资源时为404错误。

经调试发现，在MvcConfig类中加入下面Bean，问题解决

@Bean
public HandlerMapping resourceHandlerMapping() {
logger.info("HandlerMapping");
return super.resourceHandlerMapping();
}

为什么要显式声明该Bean，尚未得知。

另外，如果在MvcConfig类中加注解，@Configuration，在WebInitializer类中配置

AnnotationConfigWebApplicationContext springMvcContext = new AnnotationConfigWebApplicationContext();
springMvcContext.register(MvcConfig.class);

4000

将会导致MvcConfig加载两次，可以注释掉其中一边。