Authentication to MongoDb using Java

MongoDB provides basic support for authentication with the auth setting. For multi-instance deployments (i.e. replica sets, and sharded clusters) use the keyFile setting, which implies auth, and allows intra-deployment authentication and operation. Be aware of the following behaviors of MongoDB’s authentication system:

Enable auth settings to MongoDb requires few steps:
Invoke addUser command on mongo shell:


Start the mongod in --auth mode as shown


Check whether auth setting are working


Now test with the java program to authenticate the database in trusted enviornment.

package com.rajkrrsinghblogspot;

import java.net.UnknownHostException;

import com.mongodb.BasicDBObject;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.DBObject;
import com.mongodb.MongoClient;
import com.mongodb.ServerAddress;

public class MongoAuth {
 
 public static void main(String[] args) {
  try {
   MongoClient client = new MongoClient(new ServerAddress("localhost", 27017));
   
   DB database = client.getDB("blog");
   boolean auth = database.authenticate("rajkumar", "password".toCharArray());
   DBCollection collection = database.getCollection("posts");
   
   if(auth){  
       System.out.println("Authentication is Successful");  
       BasicDBObject query = new BasicDBObject().append("author", "rajkumar");
       BasicDBObject projection = new BasicDBObject().append("author", true);
       DBObject doc = collection.findOne(query,projection);
       System.out.println(doc.toString());
      }else{  
       System.out.println("Authentication is UnSuccessful");  
      }  
   
  } catch (UnknownHostException e) {
   e.printStackTrace();
  }
  
  
  
  
 }

}