I see this feature in the new Tomcat 8.5 release.

- Add the ability for a UserDatabase to monitor the backing XML file
for changes and reload the source file if a change in the last
modified time is detected. This is enabled by default meaning that
changes to $CATALINA_BASE/conf/tomcat-users.xml will now take
effect a short time after the file is saved.

I did some investigation and want to confirm this feature has been in 9.0, so 
that 9.0.20 already operates that way.


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