Problem with connecting to MongoDB on Java

Question

I have a problem with my MongoDB in Java. I cannot connect to it I always get an exception and could not resolve it. I use Maven Dependencies for that. I tried using other versions of the dependency.

I also checked that the MongoDB is running. I started it with net start MongoDB. My code:

import com.mongodb.MongoClient;
import com.mongodb.MongoClientURI;

public class MongoDBTest {

    public static void main(String[] args) throws Exception {
        MongoClient mongoClient = new MongoClient(new MongoClientURI("mongodb://127.0.0.1:27017"));
    }

}

My dependency:

<dependency>
    <groupId>org.mongodb</groupId>
    <artifactId>mongo-java-driver</artifactId>
    <version>3.10.0</version>
</dependency>

And the exception i got:

Exception in thread "main" java.lang.NoSuchMethodError: com.mongodb.ConnectionString.getThreadsAllowedToBlockForConnectionMultiplier()Ljava/lang/Integer;
at com.mongodb.MongoClientURI.getOptions(MongoClientURI.java:351)
at com.mongodb.Mongo.createCluster(Mongo.java:724)
at com.mongodb.Mongo.<init>(Mongo.java:312)
at com.mongodb.Mongo.<init>(Mongo.java:308)
at com.mongodb.MongoClient.<init>(MongoClient.java:326)
at schlueting.arbeiten.MongoDBTest.main(MongoDBTest.java:9)

Please follow instruction from this link: Installation - Java Driver. Check your Maven dependency. And, Connecting. — prasad_
– prasad_, Commented Oct 27, 2020 at 10:33
It could help if you include which MongoDB version you are using. Also writing the versions for Java and Maven wouldn't hurt. — madtyn
– madtyn, Commented Oct 27, 2020 at 11:41

Christopher Schlüting · Accepted Answer · 2020-10-28 08:19:22Z

2

The solution was to add the following to the Maven dependencies:

<dependency>
    <groupId>org.mongodb</groupId>
    <artifactId>mongodb-driver-sync</artifactId>
    <version>3.10.1</version>
</dependency>

That fixed the Exception and I could connect to the MavenDB.

Btw. I was using MongoDB 4.4 and JDK 11.

answered Oct 28, 2020 at 8:19

Christopher Schlüting

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