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Questions tagged [mongo-java]

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315 questions
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Load data from MongoDB to HashMap

i am wondering how can i do to load a HashMap from MongoDB using Java, this is a project of mine for Minecraft & Bukkit. I have saved the data like the following: private Map petNames = new HashMap(); and i am saving…
ItsErikR
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Error linking to mongoDB java driver

I downloaded the mongo-java-driver-2.11.2.jar file from here - http://central.maven.org/maven2/org/mongodb/mongo-java-driver/2.11.3/ In my example application i have following code - import com.mongodb.MongoClient; import…
Hobby_Web_programmer
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Is write operations go to secondary when i set readpreference as secondary in mongodb?

I have replication set up (localhost:27017(primary),localhost:27018(secondary),localhost:27019(arb)) I have set the readPrefrence as secondary in connection lever like below mongoInstance.setReadPreference(ReadPreference.secondary()); When i save…
rajesh
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Mongodb - append on duplicate record

I'm trying to accomplish this task in Java using mongodb. Let's say I have a list of employees (firstname, lastname, phone-number). Now, some employees can have more than one phone number. Let's say I have a list of employees (I'm parsing an xml…
Alistair
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Hidden replica set do not take part in election

I have a replica set of three server and a backup server, The backup server is made "hidden"=true and "priority"=0` My concern is when I have one of my secondary and backup server up, my secondary does not changes into primary, which means hidden…
Phalguni Mukherjee
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Match Query - MongoDB

Am using mongo to store my documents. And one of them looks like below. Name: first: joe last: blo address: city: Paris state: London relatives: first order: aunt: ashley uncle: tom second order aunt: roma uncle:…
Karthik Balasubramanian
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Update not inserting a object in subarray,when upsert=true

I am using mongodb update method with upsert=true. My data looks like this: {"my_id":"1", "test_list":[{"test_id":1,"test_name":"pppp"}]} now I am using the following…
Phalguni Mukherjee
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Creating MongoDB collections at runtime and deleting it

I am developing an app whose data repo is MongoDB. I have only 2 collections in the database say A and B. There is only one type of transaction which happens from the application layer. This transaction produces 2 queries and these 2 queries hits…
Timothy Rajan
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db.printCollectionStats() error

I am getting the following error when I run: db.printCollectionStats() error: { "$err" : "stale config on lazy receive :: caused by :: $err: \"[myzips.zips] shard version not ok in Client::Context: this shard contains versioned chunks for…
Phalguni Mukherjee
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Query related to production environment

I have configured my production environment with the following details: 1. Three config server 2. Two router(mongoose) 3. Two shards of three replica set. My question is, I am trying to connect to the sharded database with the help of mongo java…
Phalguni Mukherjee
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Querying tag based replica set

I have configured my replica set with tag fields as given in doc example: { "_id" : "rs0", "version" : 2, "members" : [ { "_id" : 0, "host" : "mongodb0.example.net:27017", …
Phalguni Mukherjee
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Aggregate,Find,Group confusion?

I am building a web based system for my organization, using Mongo DB, I have gone through the document provided by mongo db and came to the following conclusion: find: Cannot pull data from sub array. group: Cannot work in sharded…
Phalguni Mukherjee
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MongoDB: how to group by date with mongo date aggregration using java driver

I have been struggling writing to convert a mongo shell command to java query on top of the java mongo driver in order to call it in my webapp project: the command is as follow: db.post.aggregate( { $match: { dateCreated: { …
black sensei
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Exception determining maxBSONObjectSize/connection refused because too many open connections using Mule Mongo Connector

I'm using the Mule Mongo Connector to make some operations in a Mongo DB. I have been using it for a while without having this issue, but now I have this exception after running for a while my flow in Mule: 31-ago-2013 23:33:13…
user2417250
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Sorting in distinct data

on calling db.distinct() method always return the data in ascending order sorted. Is their a way I can get the data sorted in descending order?
Phalguni Mukherjee
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