Eclipse/Tomcat note to self

Tomcat stops reading config data.  Error with docBase, directory does not exist or is not readable.  Here's what seemed to help:

Remove Tomcat as a server.  Close and restart Eclipse.  Add Tomcat as a server, with the correct project.  Re-add /Catalina/localhost/my.xml.  Make sure the entry is in my.xml and not in server.xml.