Cannot insert into MongoDB using java

Question

I am new to MongoDb. I am trying to insert the data in MongoDb using java. Everything works fine but when i try to use insert() function to insert the data error is shown. It says change type of documents to DBObject[].

Database.java

package database;

import com.mongodb.BasicDBObject;
import com.mongodb.BasicDBObjectBuilder;
import com.mongodb.DB;
import com.mongodb.MongoClient;
import com.mongodb.DBCollection;
import com.mongodb.DBCursor;
import com.mongodb.DBObject;
import com.mongodb.Mongo;
import com.mongodb.MongoException;
public class Database 
{

    public static void main(String args[])
    {
        MongoClient mongo= new MongoClient("localhost",80);
        DB db = mongo.getDB("Collection");
        DBCollection group=db.getCollection("Group");
        BasicDBObject documents= new BasicDBObject();
        documents.put("saf", "ad");

        group.insert(documents);//error is shown here
    }
}

Please copy and paste the exact error message that you get. It contains important information about what's wrong. — Jesper
– Jesper, Commented Dec 8, 2015 at 8:22
What version of MongoClient are you using? It looks like you are using an old version that did not yet have the insert method that takes varargs. Use a newer version of MongoClient. — Jesper
– Jesper, Commented Dec 8, 2015 at 8:29

Vivek Singh · Accepted Answer · 2015-12-08 08:29:08Z

3

BasicDBObject as subsets of DBObject. Also to save the BasicDBObject we have a call as save method

group.save(documents);

edited Dec 8, 2015 at 8:29

answered Dec 8, 2015 at 8:23

Vivek Singh

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2 Comments

Jesper Over a year ago

A cast is not necessary, because BasicDBObject is a subtype of DBObject.

Vivek Singh Over a year ago

My bad I have updated my code also we can save the BasicDBObject. As there is a method for that

Koustav Ray · Accepted Answer · 2015-12-08 09:10:13Z

0

Your Code is correct and runs as is. Just update the mongo-java driver to version 2.13.0 from your existing one. Download link:

JavaDriver2.13

or: All Mongo Drivers

edited Dec 8, 2015 at 9:10

answered Dec 8, 2015 at 8:35

Koustav Ray

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2 Comments

N CR7 Over a year ago

It says to change to DBObject[]

Koustav Ray Over a year ago

I tried running your code as a junit test and it was fine,just added throws UnknownHostException to the method..

Dev · Accepted Answer · 2015-12-08 12:50:11Z

0

You are using .insert() on DBCollection.

public WriteResult insert(DBObject... arr)
                   throws MongoException
Saves document(s) to the database. if doc doesn't have an _id, one will be added you can get the _id that was added from doc after the insert
Parameters:
arr - array of documents to save
Throws:
MongoException

Check JavaDoc for insert. This is expecting an array of DBObject.

That's why the error:

change type of documents to DBObject[]

As @Vivek mentioned, you can use .save() method:

public final WriteResult save(DBObject jo)
Saves an object to this collection.
Parameters:
jo - the DBObject to save will add _id field to jo if needed

Check Javadoc for save.

edited Dec 8, 2015 at 12:50

answered Dec 8, 2015 at 12:44

Dev

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