Async Aggregate APIs not working with DB version 3.0.12.

[Chandramouli Putta]

Hi,

I am trying to use the aggregate APIs to retrieve data from mongo collections. I have tried to execute the aggregate API against my local mongodb installation (version 3.2.6) which worked perfectly. When I tried to execute the same code against mongodb installation in another remote box (3.0.12), it didn't give me any results.

And I am using Mongo DB Async Driver version as (3.2.2)

                      <dependency>

<groupId>org.mongodb</groupId>

<artifactId>mongodb-driver-async</artifactId>

<version>3.2.2</version>

</dependency>

I am not getting any clues from the documentation about when the aggregation API is introduced in the Async driver API. Is this issue due to some version incompatibility?

Best Regards,

Chandra.

[Jeff Yemin]

The aggregate command was introduced prior to the 3.0 release.

Whey you say it didn't return any results, do you mean that the cursor was empty or that the callback returned an exception?  If the latter, what is the exception?

Also, please provide sample code that includes the aggregation pipeline that you're using.  Perhaps the issue is with a particular stage or expression.  To rule this out, you also might try it with an empty pipeline.

Regards,

Jeff

[Chandramouli Putta]

Hello Jeff,

This is what I tried.

myCollection.aggregate(Arrays.asList

                              (Aggregates.match(Filters.eq("sessionId", "someId")),

                                  (Aggregates.project(Document.parse("{sessionIdentity: '$sessionId',"

                                      + "sessionName: '$sessionName',"

                                      + "chassisId: '$chassisId',"

                                      + "topSpeedPerSession: {$max: ['$speedLog.speed']}}"))

                              ))).forEach(document -> {

I didn't face any problems though. It didn't give any results either.

But the same is working in 3.2.6 version.

Thanks & Regards,

Chandramouli P,

+918050488009.

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