mongodb with scala maven project - scala

Question

I am stuck on an issue. I have created a scala maven project where I am trying to communicate with mongo. My project is getting build successfuly and I do not get any error when I execute my project, but still no data is getting inserted in my mongodb.
If I insert data manually through mongo-cli then my code can read it but it is not even inserting a single record.
Could you please help me in finding where I am making mistakes.
My mongo version is 3.2.10
App.scala
package com.assignment.scala
import org.mongodb.scala._
import org.mongodb.scala.model.Aggregates._
import org.mongodb.scala.model.Filters._
import org.mongodb.scala.model.Projections._
import org.mongodb.scala.model.Sorts._
import org.mongodb.scala.model.Updates._
import org.mongodb.scala.model._
/**
* #author ${user.name}
*/
object App {
def main(args: Array[String]) {
println("Calling insertDoc==")
insertDoc()
}
def insertDoc() = {
val mongoClient = MongoClient()
val database = mongoClient.getDatabase("assignment")
val collection = database.getCollection("links")
println("collection find : " + collection.find())
collection.find().subscribe(
(user: Document) => println("document------------"+user.toJson()),
(error: Throwable) => println(s"Query failed: ${error.getMessage}"),
() => println("Done"))
collection.drop()
val bufferedSource = io.Source.fromFile("/home/impadmin/ServiceSource/ml-latest-small/links.csv")
var firstLine = List[String]();
var docList = List[Document]();
for ((line,count) <- bufferedSource.getLines.zipWithIndex) {
val cols = line.split(",").map(_.trim)
if (firstLine.size <= 0 && cols.length > 0) {
firstLine = cols.toList;
} else {
var doc: Document = Document("_id" -> count)
for ((a, b) <- firstLine zip cols) {
doc ++= Document(a -> b)
}
docList = docList :+ doc
collection.insertOne(doc)
}
}
val doc3 = Document("name" -> "MongoDB", "type" -> "database",
"count" -> 1, "info" -> Document("x" -> 203, "y" -> 102))
collection.insertOne(doc)
collection.find().subscribe((doc1: Document) => println(doc1.toJson()),
(e: Throwable) => println(s"There was an error: $e"))
}
}

Answer 1

It worked using subscribe:
val insertObservable1: Observable[Completed] = collection.insertMany(docList);
val latch1 = new CountDownLatch(1)
insertObservable1.subscribe(new Observer[Completed] {
override def onError(e: Throwable): Unit = {
println("Error1")
e.printStackTrace()
}
override def onSubscribe(subscription: Subscription): Unit = {
subscription.request(java.lang.Long.MAX_VALUE)
println("inserting1-------------")
}
override def onComplete(): Unit = {
println("Completed1")
latch1.countDown()
}
override def onNext(result: Completed): Unit = {
println("Next1-----------")
}
})
latch1.await()
}
})