lagom 1.3 missing MessageSerializer for play.api.mvc.Result

[guy.y...@googlemail.com]

Hey Guys,

I am working on a service for uploading file and I am using Lagom 1.3.x and specially the Play Framework.
I have a MessageSerializer compile problems with com.lightbend.lagom.scaladsl.api.ServiceCall and not with
com.lightbend.lagom.javadsl.api.ServiceCall. The Java implementation of the service compiles without failures and use com.lightbend.lagom.javadsl.server.PlayServiceCall.

Here is just the signature of one method of the service api:
1- Scala version - def uploadMedia(id: String): ServiceCall[NotUsed, play.api.mvc.Result]
2- Java version - ServiceCall<NotUsed, play.api.mvc.Result> uploadMedia(id: String)

The following is the compiler error concerning the missing MessageSerializer for play.api.mvc.Result:

[error] xxxx/media-service-scala-api/src/main/scala/com/ndolo/media/service/MediaService.scala:19: could not find implicit value for parameter responseSerializer: com.lightbend.lagom.scaladsl.api.deser.MessageSerializer[play.api.mvc.Result, _]
[error]       Service.restCall(Method.POST, "/service/media/users/:uploadMedia/upload", uploadMedia _),
[error]                       ^
[error] one error found

Do I miss something? Please I would be glad to have support concerning this issue.


Best,

Guy

[Tim Moore]

Hi Guy,

Lagom does not use the Play Result class natively. The expectation is that you will use a domain-specific type that supports serialization to some common format.

You can use akka.Done if you don't have any information you need to send in the response.

Best,

Tim

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Tim Moore

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tim....@lightbend.com
+61 420 981 589
Skype: timothy.m.moore

[guy.y...@googlemail.com]

Hi Tim,

thanks for your answer concerning the issue.
But actually I need to send some information in the response. So I am investigating how to transform a PlayServiceCall<Request, Response> to a ServiceCall<Request, Response> to get rid rid from PlayServiceCall<Request, Response>.

interface PlayServiceCall<Request, Response> {
       
  EssentialAction invoke(Function<ServiceCall<Request, Response>, EssentialAction> wrapCall);
}

is there a good way to do this? Help would be appreciated

Guy

Am Mittwoch, 29. November 2017 11:20:43 UTC+1 schrieb Tim Moore:

Hi Guy,

Lagom does not use the Play Result class natively. The expectation is that you will use a domain-specific type that supports serialization to some common format.

You can use akka.Done if you don't have any information you need to send in the response.

Best,

Tim

On Mon, Nov 20, 2017 at 5:57 AM, guy.youansi via Lagom Framework Users <lagom-f...@googlegroups.com> wrote:

Hey Guys,

I am working on a service for uploading file and I am using Lagom 1.3.x and specially the Play Framework.
I have a MessageSerializer compile problems with com.lightbend.lagom.scaladsl.api.ServiceCall and not with
com.lightbend.lagom.javadsl.api.ServiceCall. The Java implementation of the service compiles without failures and use com.lightbend.lagom.javadsl.server.PlayServiceCall.

Here is just the signature of one method of the service api:
1- Scala version - def uploadMedia(id: String): ServiceCall[NotUsed, play.api.mvc.Result]
2- Java version - ServiceCall<NotUsed, play.api.mvc.Result> uploadMedia(id: String)

The following is the compiler error concerning the missing MessageSerializer for play.api.mvc.Result:

[error] xxxx/media-service-scala-api/src/main/scala/com/ndolo/media/service/MediaService.scala:19: could not find implicit value for parameter responseSerializer: com.lightbend.lagom.scaladsl.api.deser.MessageSerializer[play.api.mvc.Result, _]
[error]       Service.restCall(Method.POST, "/service/media/users/:uploadMedia/upload", uploadMedia _),
[error]                       ^
[error] one error found

Do I miss something? Please I would be glad to have support concerning this issue.


Best,

Guy

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[Tim Moore]

Hi Guy,

Could you be more specific about what you need to do? I don't totally understand what's wrong from the small amount of code provided. Can you share an example on GitHub?

Best,

Tim

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[guy.y...@googlemail.com]

Hi Tim,

thanks a lot and I will try to share the code over gihub. I will let you know when I am done.

Best,

Guy

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[guy.y...@googlemail.com]

Hi Tim,

sorry for taking long time concerning this issue. I was just to busy with other stuff.
Now I have a github project (https://github.com/ralphlaude/upload-service) and you can now better understand, what the issue is.

Thanks a lot for helping.

Best,

Guy

Am Dienstag, 12. Dezember 2017 05:54:43 UTC+1 schrieb Tim Moore:

Hi Guy,

Could you be more specific about what you need to do? I don't totally understand what's wrong from the small amount of code provided. Can you share an example on GitHub?

Best,

Tim

[Tim Moore]

Guy,

You might be interested in the new file upload recipe: https://github.com/lagom/lagom-recipes/tree/master/file-upload/file-upload-scala-sbt

This shows a different approach for handling files using an ordinary Play controller, and demonstrates composing Play routes with a Lagom service in the same application.

I hope that makes things simpler. We look forward to hearing your feedback.

Best,

Tim

To view this discussion on the web visit https://groups.google.com/d/msgid/lagom-framework/a883896e-ec13-40d5-8a3f-29d34b401e2c%40googlegroups.com.

For more options, visit https://groups.google.com/d/optout.

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Tim Moore

Lagom Tech Lead, Lightbend, Inc.

[guy.y...@googlemail.com]

Hi Tim,

Thanks a lot.
I will take a look at the recipe and perhaps I will come back to you.

Best,

Guy

Am Dienstag, 6. März 2018 07:24:46 UTC+1 schrieb Tim Moore:

Guy,

You might be interested in the new file upload recipe: https://github.com/lagom/lagom-recipes/tree/master/file-upload/file-upload-scala-sbt

This shows a different approach for handling files using an ordinary Play controller, and demonstrates composing Play routes with a Lagom service in the same application.

I hope that makes things simpler. We look forward to hearing your feedback.

Best,

Tim

On Mon, Feb 26, 2018 at 7:20 AM, guy.youansi via Lagom Framework Users <lagom-f...@googlegroups.com> wrote:

Hi Tim,

sorry for taking long time concerning this issue. I was just to busy with other stuff.
Now I have a github project (https://github.com/ralphlaude/upload-service) and you can now better understand, what the issue is.

Thanks a lot for helping.

Best,

Guy

Am Dienstag, 12. Dezember 2017 05:54:43 UTC+1 schrieb Tim Moore:

Hi Guy,

Could you be more specific about what you need to do? I don't totally understand what's wrong from the small amount of code provided. Can you share an example on GitHub?

Best,

Tim

To view this discussion on the web visit https://groups.google.com/d/msgid/lagom-framework/2eb802cc-09e2-4a2d-a9e7-a252a932bdde%40googlegroups.com.

For more options, visit https://groups.google.com/d/optout.

--

Tim Moore

Senior Engineer, Lagom, Lightbend, Inc.

tim....@lightbend.com
+61 420 981 589
Skype: timothy.m.moore

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