Tomcat404错误：All URLs used to access the Manager application should now start with one of the followi

环境：

IDE：idea 2017.02

server：Tomcat 9.0.6

框架：ssm + redis

错误现象：

ssm框架下，request的映射路径没有问题，控制台也没有抛出异常，主页能正常打开，但是不能跳转到Controller的路径，

报了以下错误：

The page you tried to access (/manager/text/sessions) does not exist.

The Manager application has been re-structured for Tomcat 7 onwards and some of URLs have changed. All URLs used to access the Manager application should now start with one of the following options:

/manager/html for the HTML GUI
/manager/text for the text interface
/manager/jmxproxy for the JMX proxy
/manager/status for the status pages
Note that the URL for the text interface has changed from "/manager" to "/manager/text".

You probably need to adjust the URL you are using to access the Manager application. However, there is always a chance you have found a bug in the Manager application. If you are sure you have found a bug, and that the bug has not already been reported, please report it to the Apache Tomcat team.

Tomcat找不到页面，Manager Application在Tomcat7中做了更新，所有访问Manager Application的URL必须以下列之一开头，访问的URL不正确，导致找不到页面。

原因猜测：

网上查了一下，只找到一个帖子：https://stackoverflow.com/questions/36462764/accessing-tomcat-manager-throws-404

他给了解决方法，在Tomcat路径下找到配置文件，context.xml，增加一句：

<!-- The contents of this file will be loaded for each web application -->
<Context privileged="true">

    <!-- Default set of monitored resources. If one of these changes, the    -->
    <!-- web application will be reloaded. 

加上一句<Context privileged="true">，说是Tomcat权限问题，没仔细研究过，直接改了配置文件，但是没有用。

我的解决方法和一点猜想：

看日志的信息表达的意思可能是因为/manager....是访问Tomcat内部的配置的路径？我看到之前那个人的访问路径也有/manager..，比如http://localhost:8080/manager/html....是访问Tomcat的某个管理项的，其他类似，相当于manager在路径里是不能用的。

于是我改了Controller类里映射路径，把@RequestMapping("/manager")里的"/manager"换成其他字符串，

然后重新启动Tomcat就能正常访问了。