Working with mongodb from Java

Question

I have launch mongodb server:

[[email protected]][~]% mongod --dbpatmongod --dbpath /home/demas/temp/  
Mon Apr 19 09:44:18 Mongo DB : starting : pid = 4538 port = 27017 dbpath = /home/demas/temp/ master = 0 slave = 0  32-bit 

** NOTE: when using MongoDB 32 bit, you are limited to about 2 gigabytes of data
**       see http://blog.mongodb.org/post/137788967/32-bit-limitations for more

Mon Apr 19 09:44:18 db version v1.4.0, pdfile version 4.5
Mon Apr 19 09:44:18 git version: nogitversion
Mon Apr 19 09:44:18 sys info: Linux arch.local.net 2.6.33-ARCH #1 SMP PREEMPT Mon Apr 5 05:57:38 UTC 2010 i686 BOOST_LIB_VERSION=1_41
Mon Apr 19 09:44:18 waiting for connections on port 27017
Mon Apr 19 09:44:18 web admin interface listening on port 28017

I have created documents by console client:

[[email protected]][~]% mongo
MongoDB shell version: 1.4.0
url: test
connecting to: test
type "help" for help
> db.some.find();
 { "_id" : ObjectId("4bcbef3c3be43e9b7e04ef3d"), "name" : "mongo" }
 { "_id" : ObjectId("4bcbef423be43e9b7e04ef3e"), "x" : 3 }

Now I am trying to work with MongoDb from Java:

import com.mongodb.*;
import java.net.UnknownHostException;

public class test1 {
    public static void main(String[] args) {
    System.out.println("Start");

        try {
        Mongo m = new Mongo("localhost", 27017);
        DB db = m.getDB("test");

        DBCollection coll = db.getCollection("some");

        coll.insert(makeDocument(10, "James", "male"));
        System.out.println("Finish");
    }
    catch (UnknownHostException ex) {
       ex.printStackTrace();
    }
    catch (MongoException ex) {
       ex.printStackTrace();
    }
    }

    public static BasicDBObject makeDocument(int id, String name, String gender) {
        BasicDBObject doc = new BasicDBObject();
        doc.put("id", id);
        doc.put("name", name);
        doc.put("gender", gender);
        return doc;
    }
 }

But execution stops on line coll.insert():

 [[email protected]][~/dev/study/java/mongodb]% javac test1.java
 [[email protected]][~/dev/study/java/mongodb]% java test1      
 Start

There are not messages from mogodb server regarding accepted connection. Why?

Answer 1

Hm...

If I change the line:

Mongo m = new Mongo("localhost", 27017);

to:

Mongo m = new Mongo();

all works fine.

Answer 2

try to change localhost to 127.0.0.1. Maybe it will be ok