Connecting to MongoDB in Java

Question

I'm following this tutorial to learn how to connect to MongoDB in Java, however, I'm encountering a problem and despite research, I can't seem to fix it. I do exactly what the tutorial tells me to do:

1. Create a new Java project
2. Add mongo-java-driver (I made sure I used the right one including the bson file, which seemed to be the problem in the other questions).
3. I create a new class and create a new MongoClient

This is my code up until now:

import com.mongodb.MongoClient;
import  com.mongodb.DB;


public class MongoDemo {

    public static void main(String[] args) {

        MongoClient mongoClient = new MongoClient("localhost", 27017);
        DB db = mongoClient.getDB("test");

    }

}

Now, I think the problem is with how I added the mongo-java-driver, since I get the following error in the first line: The import com.mongodb.MongoClient cannot be resolved but I can't seem to figure out how to fix that.

I did download the correct file and added it as an external library. When I type import com.mongodb. I do get a few suggestions, however, MongoClient is not one of them. What did I do wrong?

Answer 1

You may be looking for something like this.

import com.mongodb.DB;
import com.mongodb.MongoClient;
import com.mongodb.ServerAddress;

public class MongoDemo {

    public static void main(String[] args) {
        ServerAddress serverAddress = new ServerAddress("http://localhost", 27017);
        MongoClient mongoClient = new MongoClient(serverAddress);
        DB db = mongoClient.getDB("test");
    }
}

When creating this, I created a maven project to manage the dependencies better and included the most recent MongoDB dependencies. Here's my POM.xml

<project xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>MongoDBExample</groupId>
    <artifactId>MongoDBExample</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <build>
        <sourceDirectory>src</sourceDirectory>
        <plugins>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.7.0</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
    <dependencies>
        <!-- https://mvnrepository.com/artifact/org.mongodb/mongo-java-driver -->
        <dependency>
            <groupId>org.mongodb</groupId>
            <artifactId>mongo-java-driver</artifactId>
            <version>3.7.0</version>
        </dependency>
    </dependencies>
</project>

I haven't tested this, however, notice how some of the code has changed. This is because some of the code used in the demo has been deprecated. This should be close.