folow first 2 steps https://kafka.apache.org/quickstart but map kafka to 9093 to avoid conflict
but in step 3:
bin/kafka-topics.sh --create --zookeeper localhost:2181 --replication-factor 1 --partitions 2 --topic sensor
then the java kafka consumer and producer are working
buld using the producer with ./gradlew build for the consumer please use gradle shadow
execute via idea or java - jar.