WriteConcernTest.java

public class WriteConcernTest {
    public static void main(String[] args) throws InterruptedException {
        MongoClient client = MongoClients.create();

        System.out.println(client.getSettings().getWriteConcern());

        client.getDatabase("test").getCollection("writeConcernTest").insertOne(new Document(), (result, t) -> System.out.println("DONE!"));

        Thread.sleep(Long.MAX_VALUE);
    }
}