Scala NoSuchMethodError: 'scala.collection.mutable.Buffer (and all other Scala packages)

[GensaGames]

Steps to reproduce:

• Pull the most recent revision of the project
• Open Scala S3Sink project
• add next (see below) in the main method and import
• sbt assembly (or your other step to build jar)

    import scala.jdk.CollectionConverters._

    val a = util.Arrays.asList(1,2,3,4,5)
    val b = a.asScala.toList.map { x =>
      x^2
    }

    log.info(s"Does it work?: $b")

Error in runtime: java.lang.NoSuchMethodError: 'scala.collection.mutable.Buffer scala.collection.convert.AsScalaConverters.asScala$(scala.collection.convert.AsScalaConverters, java.util.List)'

Please Note! While checking jar package you can find, that all the required libraries already included, for ex. scala.collection.mutable.Buffer and scala.collection.convert.AsScalaConverters already part of the jar and runtime. You can check jar package with command jar tf <file>. However it doesn't work when you build and run in Kinesis Flink application.

[GensaGames]

The issue was in Flink version on AWS. Starting from 1.15 scala interpreter was included, but prior versions doesn't work with scala versions.