我使用的 MongoDB 版本是 3.6.9。

下面是一个很基础的示例代码，功能就是连接 MongoDB：

package com.zifeiy.snowflake.handle.etl.mongodb;
import com.mongodb.MongoClient;
public class MongodbTest {
public static void main(String[] args) {
MongoClient mongoClient = new MongoClient();
}
}

但是执行后报错：

Exception in thread "main" java.lang.IllegalArgumentException: clusterListener can not be null
	at com.mongodb.assertions.Assertions.notNull(Assertions.java:37)
	at com.mongodb.connection.ClusterSettings$Builder.addClusterListener(ClusterSettings.java:218)
	at com.mongodb.connection.DefaultClusterFactory.getClusterSettings(DefaultClusterFactory.java:190)
	at com.mongodb.connection.DefaultClusterFactory.create(DefaultClusterFactory.java:117)
	at com.mongodb.Mongo.createCluster(Mongo.java:744)
	at com.mongodb.Mongo.createCluster(Mongo.java:728)
	at com.mongodb.Mongo.<init>(Mongo.java:293)
	at com.mongodb.Mongo.<init>(Mongo.java:288)
	at com.mongodb.Mongo.<init>(Mongo.java:284)
	at com.mongodb.MongoClient.<init>(MongoClient.java:179)
	at com.mongodb.MongoClient.<init>(MongoClient.java:156)
	at com.mongodb.MongoClient.<init>(MongoClient.java:117)
	at com.zifeiy.snowflake.handle.etl.mongodb.MongodbTest.main(MongodbTest.java:7)

解决办法是：将 pom.xml 中的 mongodb-driver 版本改成 3.6 的就可以了：

<dependency>
    <groupId>org.mongodb</groupId>
    <artifactId>mongodb-driver</artifactId>
    <version>3.6.4</version>
</dependency>

改成 3.6 之后再次运行出现如下提示，说明连接成功：

07:38:15.249 [main] INFO org.mongodb.driver.cluster - Cluster created with settings {hosts=[127.0.0.1:27017], mode=SINGLE, requiredClusterType=UNKNOWN, serverSelectionTimeout='30000 ms', maxWaitQueueSize=500}
07:38:15.276 [main] DEBUG org.mongodb.driver.cluster - Updating cluster description to  {type=UNKNOWN, servers=[{address=127.0.0.1:27017, type=UNKNOWN, state=CONNECTING}]