com.mongodb.MongoCommandException: Command failed with error 48: 'target namespace exists' on server localhost:27017. The full response is { "ok" : 0.0, "errmsg" : "target namespace exists", "code" : 48, "codeName" : "NamespaceExists" }

import java.util.concurrent.CountDownLatch;

import com.mongodb.async.*;
import com.mongodb.async.client.*;
import com.mongodb.client.model.*;
import org.bson.Document;

public class RenameTest {

  public static void main(final String[] args) throws InterruptedException {

      MongoClient client = MongoClients.create();

      MongoDatabase db = client.getDatabase("renametest");

      MongoCollection<Document> src = db.getCollection("src");
      MongoCollection<Document> dst = db.getCollection("dst");

      Document doc = new Document("name", "rename");

      final CountDownLatch l1 = new CountDownLatch(1);
      src.insertOne(doc, new SingleResultCallback<Void>() {
          @Override
          public void onResult(final Void result, final Throwable t) {
              System.out.println("Inserted src");
              l1.countDown();
          }
      });
      l1.await();

      final CountDownLatch l2 = new CountDownLatch(1);
      dst.insertOne(doc, new SingleResultCallback<Void>() {
          @Override
          public void onResult(final Void result, final Throwable t) {
              System.out.println("Inserted dst");
              l2.countDown();
          }
      });
      l2.await();

      final CountDownLatch l3 = new CountDownLatch(1);
      src.renameCollection(dst.getNamespace(), new RenameCollectionOptions().dropTarget(true), new SingleResultCallback<Void>() {
          @Override
          public void onResult(final Void result, final Throwable t) {
              System.out.println("Rename result");
              System.out.println(result);
              System.out.println(t);
              l3.countDown();
          }
      });
      l3.await();
  }
}