NickBurkard commented on pull request #14544:
URL: https://github.com/apache/flink/pull/14544#issuecomment-929357246
>
>
> @MartijnVisser @NickBurkard Do you already have some form of migration
guide for 2.11 users?
The main thing I would recommend is for users building Scala applications
with sbt to properly add dependencies based on their Scala version, that way
they don't end up with projects using the wrong dependencies. Scala 2.x
versions are binary incompatible with one another.
```scala
val flinkVersion = "1.13.2"
lazy val myProject = project
.in(file("example-app"))
.settings(
scalaVersion := "2.12.15",
libraryDependencies ++= Seq(
// be sure to use `%%`, it uses the dependency based on Scala version.
"org.apache.flink" %% "flink-streaming-scala" % flinkVersion %
Provided,
// other dependencies go here
)
)
```
If this isn't done, or if a 2.12 application is deployed to a Flink cluster
running Scala 2.11, a runtime error will occur about a missing `Product` class:
https://stackoverflow.com/questions/42498035/java-lang-noclassdeffounderror-scala-productclass
I can add some of these notes to a separate doc in the repo if that sounds
good.
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