debug發(fā)現(xiàn)的錯誤位置，報錯信息為空指針異常，debug發(fā)現(xiàn)這個為null但是不知道原因這個是請求的參數(shù)，我感覺沒錯啊，求解是什么問題額項目中有配置@Bean(name = DispatcherServlet.MULTIPART_RESOLVER_BEAN_NAME)         public CommonsMultipartResolver commonsMultipartResolver(MultipartConfigElement element) {             CommonsMultipartResolver resolver = new CommonsMultipartResolver();             resolver.setMaxUploadSize(element.getMaxRequestSize());             resolver.setMaxUploadSizePerFile(element.getMaxFileSize());             resolver.setResolveLazily(multipartProperties.isResolveLazily());             return resolver;         }我快愁死了，我把這個bean注釋掉就能拿到文件了，我在網(wǎng)上找的要不就是吧HttpServletRequest強轉(zhuǎn)成MultipartHttpServletRequest，可我為啥弄了還是null呢，求救啊