SpringBoot-项目打成Jar包，出现页面无法跳转

thymeleaf在开发环境正常，但用jar运行时报错 Error resolving template template might not exist or might not be accessible

 Error resolving template "login", template might not exist or might not be accessible by any of the configured Template Resolvers

 错误的方式：

@RequestMapping(value="", method = RequestMethod.GET)
public String Index() {
       return "/message/myMessage";
}

正确的方式：

@RequestMapping(value="", method = RequestMethod.GET)
public String Index() {
       return "message/myMessage";
}