Scala driver: org.bson.codecs.configuration.CodecConfigurationException: Can't find a codec for class com.mongodb.client.model.BsonField

[Yann Simon]

Hi,

I'm trying to use the aggregate with the scala driver, but I have the following error:

Caused by: org.bson.codecs.configuration.CodecConfigurationException: Can't find a codec for class com.mongodb.client.model.BsonField.

at org.bson.codecs.configuration.CodecCache.getOrThrow(CodecCache.java:46) ~[mongo-java-driver-3.1.1.jar:na]

at org.bson.codecs.configuration.ProvidersCodecRegistry.get(ProvidersCodecRegistry.java:63) ~[mongo-java-driver-3.1.1.jar:na]

at org.bson.codecs.configuration.ProvidersCodecRegistry.get(ProvidersCodecRegistry.java:37) ~[mongo-java-driver-3.1.1.jar:na]

at com.mongodb.client.model.BuildersHelper.encodeValue(BuildersHelper.java:35) ~[mongo-java-driver-3.1.1.jar:na]

at com.mongodb.client.model.Aggregates$1.toBsonDocument(Aggregates.java:129) ~[mongo-java-driver-3.1.1.jar:na]

at com.mongodb.async.client.AggregateIterableImpl.createBsonDocumentList(AggregateIterableImpl.java:185) ~[mongodb-driver-async-3.2.0.jar:na]

at com.mongodb.async.client.AggregateIterableImpl.execute(AggregateIterableImpl.java:151) ~[mongodb-driver-async-3.2.0.jar:na]

at com.mongodb.async.client.AggregateIterableImpl.batchCursor(AggregateIterableImpl.java:141) ~[mongodb-driver-async-3.2.0.jar:na]

at com.mongodb.async.client.MongoIterableSubscription.requestInitialData(MongoIterableSubscription.java:48) ~[mongodb-driver-async-3.2.0.jar:na]

at com.mongodb.async.client.AbstractSubscription.tryRequestInitialData(AbstractSubscription.java:151) ~[mongodb-driver-async-3.2.0.jar:na]

at com.mongodb.async.client.AbstractSubscription.request(AbstractSubscription.java:82) ~[mongodb-driver-async-3.2.0.jar:na]

I tried to add codec registries but it does not help.

What I am using now:

val codecRegistry = CodecRegistries.fromProviders(
  new ValueCodecProvider(),
  new DBObjectCodecProvider(),
  new BsonValueCodecProvider())

I tried to add codec registries but it does not help.
Any idea?

Thanks in advance!
Yann

[Jeff Yemin]

Hi Yann,

Can you post a code snippet for the generation of the aggregation pipeline that causes this exception?

Thanks,

Jeff

[Yann Simon]

Here it is:

import org.mongodb.scala.model.Aggregates._
import org.mongodb.scala.model.Filters._
import org.mongodb.scala.model.Accumulators._

coll.aggregate(List(
  filter(equal("target.typeId", "product")),
  group(avg("averageRating", "$rating")),
  out("rating")
))

It may not make sense for mongo - I am just trying to use the aggregate function.

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[Jeff Yemin]

Ah, I see it.  Try passing an id for the group stage, e.g.

coll.aggregate(List(
  filter(equal("target.typeId", "product")),

  group(null, avg("averageRating", "$rating")),
  out("rating")
))

Regards,

Jeff

[Yann Simon]

Thanks for this very useful suggestion!

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