error java.lang.NoSuchMethodError in java-mongodb example

Question

I have been trying to execute my first mongodb example in java. Its showing me the error. I have installed everything properly. Any help would be appreciated.it is throwing an exception Exception in thread "main"

java.lang.NoSuchMethodError: com.mongodb.ReadPreference.primary()Lcom/mongodb/ReadPreference; at com.mongodb.MongoClientOptions$Builder.(MongoClientOptions.java:731) at com.mongodb.MongoClient.(MongoClient.java:151) at com.mongodb.MongoClient.(MongoClient.java:141) at mongoDBExample.main(mongoDBExample.java:21)

This is my program code.

   public class mongoDBExample {
    public static void main(String[] args) throws UnknownHostException {

    try {

    /**** Connect to MongoDB ****/

    MongoClient mongo = new MongoClient("localhost", 27017);

    /**** Get database ****/
    // if database doesn't exists, MongoDB will create it for you
    DB db = mongo.getDB("testdb");

    /**** Get collection / table from 'testdb' ****/
    // if collection doesn't exists, MongoDB will create it for you
    DBCollection table = db.getCollection("user");

    /**** Insert ****/
    // create a document to store key and value


    BasicDBObject document = new BasicDBObject();
    document.put("name", "mkyong");
    document.put("age", "30");
    document.put("createdDate", new Date());
    table.insert(new DBObject[] {document});


    /**** Find and display ****/
    BasicDBObject searchQuery = new BasicDBObject();
    searchQuery.put("name", "mkyong");

    DBCursor cursor = table.find(searchQuery);

    while (cursor.hasNext()) {
        System.out.println(cursor.next());
    }

    /**** Update ****/
    // search document where name="mkyong" and update it with new values
    BasicDBObject query = new BasicDBObject();
    query.put("name", "mkyong");

    BasicDBObject newDocument = new BasicDBObject();
    newDocument.put("name", "mkyong-updated");

    BasicDBObject updateObj = new BasicDBObject();
    updateObj.put("$set", newDocument);

    table.update(query, updateObj);

    /**** Find and display ****/
    BasicDBObject searchQuery2
        = new BasicDBObject().append("name", "mkyong-updated");

    DBCursor cursor2 = table.find(searchQuery2);

    while (cursor2.hasNext()) {
        System.out.println(cursor2.next());
    }

    /**** Done ****/
    System.out.println("Done");

    } catch (MongoException e) {
    e.printStackTrace();
    }

  }
}

Solution

Issue with

MongoClient mongo = new MongoClient("localhost", 27017);

Try with format

MongoClient mongo = new MongoClient(new MongoClientURI("mongodb://127.0.0.1:27017"));

Comments

[user1211]

What version of mongo jar you are using? Which is your line 21?

[Vikas]

@user3632894 mongo-java-driver-3.2.0

[Vikas]

MongoClient mongo = new MongoClient("localhost", 27017); this is the 21st line.

[user1211]

I have tried running your code. It works fine. Make sure you have these import statements import com.mongodb.BasicDBObject; import com.mongodb.DB; import com.mongodb.DBCollection; import com.mongodb.DBCursor; import com.mongodb.DBObject; import com.mongodb.MongoClient; import com.mongodb.MongoException; Also you are using deprecated methods.

[Jim Garrison]

This is almost always a difference in versions between the build and deployment environments. Make sure you have the same jar versions in both places.

[Vikas]

i tried reinstalling the mongodb server and tried running it once again.It worked fine for me as well.I dont what was the issue.Thanks anyways :)

[Vendetta]

Please add a little more context to your answer.