统一异常管理：报错EL1007E: Property or field 'message' cannot be found on null

根据博客教程 http://blog.didispace.com/springbootexception/ 编写demo，启动应用访问 http://localhost:8080/hello 报错： org.springframework.web.util.NestedServletException: Request processing failed; nested exception is

>>阅读原文<<