Connect to remote mongodb server with java

Question

I'm trying to connect to a remote mongodb instance, but it keeps throwing an error.

Java code:

Mongo mongo = new Mongo("172.234.52.24");
DB db = mongo.getDB("myDB");
collection = db.getCollection("myCollection");

But I keep getting the following exception:

java.io.IOException: couldn't connect to [/172.234.52.24:27017] bc:java.net.ConnectException: Connection refused

Is there something else I have to do? Set username/password when I try to access the database or change some permissions on the mongo side? Its just the normal mongo install on a ubuntu server, no added configuration or permissions.

ADDITIONAL INFORMATION: mongo 172.234.52.24:8888 doesn't work either, says exception: connect failed. I can ping the other host, and know mongo is running on it.

Any ideas? Thanks!

Answer 1

I figured it out... y'all had great suggestions but the problem was more fundamental.

In my mongo configuration file on the remote server, there was a bind_ip variable set to the local ip. Once I commented this out, everything worked properly.

Thank you all very much though!

Answer 2

Make sure you have added correct maven dependency in your pom.xml 1. spring-data-mongodb (1.5.2.RELEASE) 2. mongo-java-driver (2.13.0)

Just update your credential in following java code and it will work for you. "$external" in the below code represents that you are trying to connect database which is on Linux machine at remote location.

Below code is working in standalone Java program.

String database = "TestDev";
    String username = "[email protected]";
    String pass = "XXXXX";
    char[] password = pass.toCharArray();

    try {

        List<ServerAddress> serverAddresses = new ArrayList<ServerAddress>();
        ServerAddress address = new ServerAddress("hostname", portnumber);
        serverAddresses.add(address);
        List<MongoCredential> credentials = new ArrayList<MongoCredential>();
        MongoCredential credential = MongoCredential.createPlainCredential(username, "$external", password);
        credentials.add(credential);
        MongoClient mongoClient1 = new MongoClient(serverAddresses, credentials);
        DB db = mongoClient1.getDB(database);
        System.out.println(db.getCollectionNames());


        System.out.println("Done");
    } catch (UnknownHostException e) {
        e.printStackTrace();
    }