If you are launching tomcat from within Eclipse (using the webtools tomcat server adapter) you will have to make sure you have changed the settings to use the installation directory to launch instead of the default which uses a separate location for loading and deploying webapps. So just having the manager in your webapps in the tomcat installation wont be enough to see the manager since by default tomcat launched by Eclipse doesn't look for apps in the webapps folder.
Just make sure that catalina.base and catalina.home point to the tomcat installation directory
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