How to Connect MongoDB with Java Program

Question

I want to connect My Java Program with Mongo DB database. Below I have written my Java Program.But It's giving some Error.

import java.net.UnknownHostException;
import com.mongodb.BasicDBObjectBuilder;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.DBCursor;
import com.mongodb.DBObject;
import com.mongodb.MongoClient;
import com.mongodb.WriteResult;
import org.bson.*;

public class JavaMongo{

    public static void main(String[] args) 
    {
        try 
        {   
           MongoClient mongoClient = new MongoClient("localhost", 27017);
        MongoDatabase database = mongoClient.getDatabase("mydb");

        for (String name : database.listCollectionNames()) {

            System.out.println(name);
        }

        mongoClient.close();

        }   
        catch(Exception e)
        {   
           System.out.println(e);
        }   

    }   
}

I have following error

Errors on my terminal.

You imported everything but `MongoDatabase`. Also, never post images of errors. Copy from your terminal and paste it as text in the question. — BackSlash, Oct 03 '18 at 06:59

score 0 · Answer 1 · answered Oct 03 '18 at 07:06

You had Miss the Creating Credentials statement . So Basically this Error Showing try this code.

import java.net.UnknownHostException;
import com.mongodb.BasicDBObjectBuilder;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.DBCursor;
import com.mongodb.DBObject;
import com.mongodb.MongoClient;
import com.mongodb.WriteResult;
import com.mongodb.MongoCredential;  
import com.mongodb.client.MongoDatabase; 
import org.bson.*;

public class JavaMongo{

    public static void main(String[] args) 
    {
        try 
        {   
           MongoClient mongoClient = new MongoClient("localhost", 27017);
           // Creating Credentials 
          MongoCredential credential; 
          credential = MongoCredential.createCredential("sampleUser", "myDb", 
             "password".toCharArray()); 
        MongoDatabase database = mongoClient.getDatabase("mydb");

        for (String name : database.listCollectionNames()) {

            System.out.println(name);
        }

        mongoClient.close();

        }   
        catch(Exception e)
        {   
           System.out.println(e);
        }   

    }   
}

score 0 · Answer 2 · answered Oct 03 '18 at 08:14

0

You need to import "com.mongodb.client.MongoDatabase" for using MongoDatabase Interface.

answered Oct 03 '18 at 08:14

Avinash Thakur

81
1
1
10

score 0 · Answer 3 · answered Dec 30 '19 at 11:39

maven dependency:

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-mongodb</artifactId>
</dependency>

===========================================================================

application.properties

server.port = 8080
spring.data.mongodb.database=user_db
spring.data.mongodb.port=27017
spring.data.mongodb.host=localhost

===========================================================================

for reference use below link:(step by step explanation)

https://www.youtube.com/watch?v=2Tq2Q7EzhSA&t=7s

How to Connect MongoDB with Java Program

3 Answers3

maven dependency:

application.properties