Kafka errors when running module locally

Overview:
Steps to Reproduce:
Clone mod-inventory locally
Build it with mvn clean install
Set kafka environment variables to local kafka installation (I've used locally-installed kafka (with brew) and a docker container running kafka, with identical results)
Execute java command to run mod-inventory:

java -Dvertx.logger-delegate-factory-class-name=io.vertx.core.logging.SLF4JLogDelegateFactory -jar target/mod-inventory.jar db_connection=/Users/felkerk/folio/db_conf.json -Dport=8081 -Dlog.level=debug -Dokapi_url=https://folio-snapshot-okapi.dev.folio.org > logfile.txt

Expected Results:

Module should run locally
Actual Results:

Java command outputs strings of cryptic kafka errors, then module locks and won't accept any incoming connections. I'm attaching a file of the output I'm seeing.

Additional Information:
I'm unsure if this is a problem with my local environment-I have had one other developer on our team tell me saw similar error messages, but he reports the module runs despite them, which is not the behavior I'm experiencing.