pruner = Executors.newSingleThreadScheduledExecutor(new DaemonThreadFactory("BufferPoolPruner"));

import com.mongodb.ConnectionString;
import com.mongodb.MongoClientSettings;
import com.mongodb.MongoCredential;
import com.mongodb.client.MongoClient;
import com.mongodb.client.MongoClients;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;

public class MongoClientBug {

    public static void main(String[] args) throws Exception {
        MongoCredential credential = MongoCredential
                .createCredential(
                        "root",
                        "admin",
                        "root".toCharArray());

        MongoClientSettings settings = MongoClientSettings
                .builder()
                .credential(credential)
                .applyConnectionString(new ConnectionString("mongodb://localhost:27017"))
                .build();

        MongoClient mongoClient = MongoClients.create(settings);

        ExecutorService executorService = Executors.newSingleThreadExecutor();
        Future<?> submit = executorService.submit(() -> {
            mongoClient.close();
            System.out.println("close done");
        });

        Object o = submit.get();

        long l = System.currentTimeMillis();
        long timeperiod = 1000 * 60 * 5;
        while(System.currentTimeMillis() - l < timeperiod) {
            System.out.println("Waiting");
            Thread.sleep(1000);
        }
        System.out.println("Close JVM");
    }
}