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Questions tagged [mongo-java]

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315 questions
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Mongo Java: How to serialize DBObject as JSON on file?

I have a document in MongoDB as name: name date_created: date p_vars: { 01: { a: a, b: b, } 02: { a: a, b: b, } .... } represented as DBObject All key, value pairs are of type String I want to serialize…
daydreamer
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Mongo ReflectionDBObject, map ALL embedded array's elements to a class;

I use Mongo with native Java driver (no 3rd party library/ORM). I have this: public class Release extends ReflectionDBObject { //other fields omitted private List releaseDetailsByTerritory = new…
Shivan Dragon
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Not able to Connect to Mongo Atlas Timed out after 30000 ms while waiting to connect. Client view of cluster state is {type=UNKNOWN,

I am trying to connect my java bot to Mongo Atlas but facing this error com.mongodb.MongoTimeoutException: Timed out after 30000 ms while waiting to connect. Client view of cluster state is {type=UNKNOWN, servers=[{address=localhost:27017,…
Aman Kumar
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MongoDb Document to POJO with Default Codec Registry gives 'null' values

I am trying to map Bson Document to POJO using available Codec Registry in MongoDb 3.7, But It was giving me null values. Works well if I just print out the Bson Document. Run menthod public void run(MlsMongoConfiguration configuration,…
sudarshan kakumanu
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mongo + java + too many open files

I am using mongo-java2.4jar for communicating with the mongo server. In my webapp i am using mongo=new Mongo("serverIp","port") where ever it is required and once the processing is complete, I am closing the mongo connection using mongo.close(). But…
azhar_salati
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Getting nested Document from mongo db using java Driver

I need to create an Object graph for the documents in a collection. I am able to get all the key-value pairs. Here is the code which does that: import com.mongodb.*; import java.util.*; public class GetKeyValuePair { public static void…
aditya_gaur
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"Invalid BSON field name" during upsert

I'm trying to upsert data into a Mongo collection using the following code: val UsersColl = "Users" val UsersColl_AuthProvider = "AuthProvider" val UsersColl_UserId = "UserId" val UsersColl_Active = "Active" val UsersColl_SlackRealName =…
Glory to Russia
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MongoDB HostName/URI Configuration

Note this looks long, but provides context and lists my main questions at the bottom. I researched all parts and included references. I used the Google Cloud Launcher to create a Mongo database. This created a replica set of two Mongo servers…
Matt Goodrich
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How to check if MongoDB connection is established with Java?

In my app, MongoDB 3.2.4 runs on a custom port, I want to implement logic where my app will try to reach MongoDB on a custom port and if it fails it will use the default 27018 port. In order to do that I use the following code: String mongoClientURI…
Mike
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In mongodb version 3 using java api how do we give a hint while querying

In mongodb version 3 using java api how do we give a hint while querying The query result is FindIterable which has MongoCursor. How should I give a hint to use a particular index. With older versions there is DBCursor which have API's for hint.
Devesh
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Cannot cast BasicDBObject to [B

I have the following gridfs in a mongodb database: db.outputFs.files.find() { "_id" : ObjectId("000000000000000000000001"), "chunkSize" : 261120, "length" : 232, "md5" : "42290309186cc5420acff293b92ae21d", "filename" : "/tmp/outputFs-01.tmp",…
Pedro Montoto García
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How to find by partial binary over BinData field in mongodb?

I have a BinData field in my mongo and I need to make a find over it with partial information. Let's say that the bindata that I have looks like this: { "_id" : ObjectId("5480356518e91efd34e9b5f9"), "test" : BinData(0,"dGVzdA==") } If I do this…
Kuu
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MongoClient timeout

I recenty updated to MongoDB 2.6.3 via Ubuntu debs and also switched to Mongo Client library 2.12.2; when I now execute final MongoClient m = new MongoClient( "localhost" ); DB db = m.getDB( "test" ); System.out.println( db.getName( )…
Andreas
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$elemMatch dosen't work after $unwind in MongoDB Aggregation Framework

I have a collection of the following data: { "_id" : ObjectId("51f1fcc08188d3117c6da351"), "cust_id" : "abc123", "ord_date" : ISODate("2012-10-03T18:30:00Z"), "status" : "A", "price" : 25, "items" : [{ "sku" : "ggg", "qty" :…
Phalguni Mukherjee
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Mongodb Logs shows too many connections open

Why does mongodb logs show too many opened connections? It's showing me more than the maximum connection limit and number of current operations in db. Also my primary refused to create more connections after reaching 819 limit. That time, the number…
user2638955
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