spring boot做的WEB应用如果自定义错误提示

[shjqk]

spring boot做的WEB应用，如果调用方的URL地址不在Mapping范围内（@RequestMapping("/test")）的话，
会报“Whitelabel Error Page 。This application has no explicit mapping for /test, so you are seeing this as a fallback.”
现在想自定义这个错误页面该怎么做？


public static void main(String[] args) {
SpringApplication.run(App.class, args);
}

@RestController
@EnableAutoConfiguration
public class ProcessRequest {
@RequestMapping("/test")
public void showInfo( HttpServletRequest request, HttpServletResponse response)
{

}
}