Error upgrading to Scala 2.13.6

Question
1

I am trying to migrate to Scala - 2.13.6 and Akka - 2.6.16 with akka-actor_2.13 version 2.6.16.

Code

import akka.http.scaladsl.model.ContentType
import akka.http.scaladsl.model.HttpCharsets.UTF-8
import akka.http.scaladsl.model.MediaTypes.{application/json, application/xml}

object MyPayloadType extends Enumeration {

val XML,
JSON = Value

def getMyPayloadType(contentType: Value): ContentType.NonBinary = contentType match {

case XML => ContentType(`application/xml`, `UTF-8`)

case JSON => ContentType(`application/json`)

}
}

Above code gives the following compilation error.
"Symbol ‘type Scala.collection.IndexedSeqOptimized’ is missing from the classpath.
This symbol is required by ‘class akka.util.ByteString’

Please suggest to resolve above.

2

My first guess would be that you have a mixture of Scala 2.12 and Scala 2.13 based JARs on your classpath.

3

also asked at akka - Unable to upgrade to Scala 2.13.6 - Stack Overflow

4

Yes. I do have some dependencies referring to Scala 2.11. These dependencies don’t have scala compatible version 2.13. So, it didn’t migrate. The following are the two dependencies

de.heikoseeberger.constructr_2.11
com.tecsisa.constructr-coordination-consul_2.11

For above, latest Scala compatible version is 2.12.

Does this mean that for me I can migrate to Scala 2.12 only?

5

Yes, all your dependencies must be compiled for the same Scala binary version (ie. must have the same version suffix).

Note, that constructr is basically abandoned since 2018:

Given the bootstrapping capabilities of Akka Management, I don’t think ConstructR adds any value any longer. At least not to me.

See Retirement · Issue #179 · hseeberger/constructr · GitHub

6

Thanks! Have moved all the dependencies to Scala 2.12 which resolved the issue.