Configuration files are cached in order to optimize the performance. When a configuration file is changed, the cache must be emptied for loading the changes into the cache and thus activating the changes made.

Use: config reload

In order to read the current active value of a configuration parameter, you can use "config echo", e.g. for reading the default charset in the main.cf configuration file:

config echo main/main.cf default.charset

would return you e.g. "UTF-8".

For reading an attribute in the form:

<mailaction html="false">

you can write: config echo scheduler/scheduler.cf scheduler.mailaction[@html].

More details on the syntax can be found in the Apache Commons Configuration documentation: https://commons.apache.org/proper/commons-configuration/userguide/quick_start.html