In our Artemis distributions we ship an embedded version of HawtIO. There does't appear to be a way to customize the some of the properties, i.e.:

[1]artemis.log:10:21:32,050 INFO [io.hawt.web.LoginServlet] hawtio login is using 1800 sec. HttpSession timeout

Setting it as a JAVA var seems to be ignored as the log message still says 1800, i.e:

<your-broker>/etc/artemis.profile:

HAWTIO_SESSION_TIMEOUT="-Dhawtio.sessionTimeout=..."
JAVA_ARGS="$JAVA_ARGS $HAWTIO_SESSION_TIMEOUT"

It would be great if there was a properties file that we could add these variables to without have to using JAVA options.