Local에서 MongoDB를 개발하다가 보면 다음과 같은 오류가 날 수도 있다. 2021-06-22 16:54:47.086 INFO 7212 --- [ main] org.mongodb.driver.cluster : No server chosen by com.mongodb.async.client.ClientSessionHelper$1@68868328 from cluster description ClusterDescription{type=UNKNOWN, connectionMode=SINGLE, serverDescriptions=[ServerDescription{address=localhost:27017, type=UNKNOWN, state=CONNECTING}]}. Waiting for 30000 ms b..