SEVERE - Can't initialize Metrics Registrar

Hi,

When deploying an app on Tomee 9.1.1 I get the following error on the 
console:


SEVERE - Can't initialize Metrics Registrar: SRMET00009: Gauge with id 
MetricID{name='classloader.loadedClasses.count', tags=[]} already exists

The app is a war which contains a MessageDriven class
I'm not using any of the metrics etc, nor can I find information about 
this error.

The app works without any issues.

Thanks in advance,

Met Vriendelijke Groet / With Kind Regards
Bart van Leeuwen