What did you do?

Tried to export Dropwizard metrics

What did you expect to see?

A list of Prometheus metrics in my browser

What did you see instead? Under which circumstances?

Internal server error. Some of our gauge metrics are initialized to null, when DropwizardExports comes across them it throws NPE at line 54:
LOGGER.log(Level.FINE, String.format("Invalid type for Gauge %s: %s", name, obj.getClass().getName()));

Environment

Ubuntu 16.04, Java8

• System information:

Linux 4.4.0-96-generic x86_64