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 org.thymeleaf.exceptions.TemplateProcessingException: Exception evaluating SpringEL expression: "exception.message" (error:10)
  

Caused by: org.thymeleaf.exceptions.TemplateProcessingException: Exception evaluating SpringEL expression: "exception.message" (error:10)


Caused by: org.springframework.expression.spel.SpelEvaluationException: EL1007E: Property or field 'message' cannot be found on null


解决办法：在Contoller中要添加一个抛出异常：


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