如何检索和添加新文档到MongoDb集合抛出com.mongodb.reactivestreams.client.MongoClient

<dependency>
    <groupId>org.mongodb</groupId>
    <artifactId>mongodb-driver-reactivestreams</artifactId>
    <version>3.12.10</version>
</dependency>

import com.mongodb.reactivestreams.client.MongoClients;
import com.mongodb.reactivestreams.client.MongoClient;
import com.mongodb.reactivestreams.client.MongoCollection;
import com.mongodb.reactivestreams.client.MongoDatabase;
import import org.bson.Document;

public class MongoDBExample {
    public static void main(String[] args) {
        // 连接MongoDB数据库
        MongoClient mongoClient = MongoClients.create("mongodb://localhost:27017");
        
        // 选择数据库
        MongoDatabase database = mongoClient.getDatabase("mydb");
        
        // 选择集合
        MongoCollection<Document> collection = database.getCollection("mycollection");
        
        // 检索文档
        collection.find().subscribe(document -> {
            System.out.println(document.toJson());
        });
        
        // 添加新文档
        Document newDocument = new Document("name", "John Doe")
                .append("age", 30)
                .append("email", "johndoe@example.com");
        collection.insertOne(newDocument).subscribe(result -> {
            System.out.println("New document inserted: " + result);
        });
        
        // 关闭连接
        mongoClient.close();
    }
}