Create a new Crowd plugin using atlas-create-crowd-plugin.
Change into the newly created plugin directory.
In the POM:
bump amps.version to the latest release (8.1.0), and
set the scope of the org.slf4j:slf4j-simple dependency to test, to keep the enforcer plugin happy
Execute mvn crowd:run. Crowd starts up, but prints this stack trace several times:
These log messages seem to be benign, but they:
potentially obscure genuine stack traces
give a bad impression to ecosystem developers
The cause is probably the same as for AMPS-1429.