[jira] [Created] (FLINK-12462) Classloading fails in 1.8.0 when Scalatest is loaded first

[Shang Yuanchun (Jira)]

Gaël Renoux created FLINK-12462:
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             Summary: Classloading fails in 1.8.0 when Scalatest is loaded first
                 Key: FLINK-12462
                 URL: https://issues.apache.org/jira/browse/FLINK-12462
             Project: Flink
          Issue Type: Bug
    Affects Versions: 1.8.0
            Reporter: Gaël Renoux


When using Flink 1.8.0 and Scala 2.11.12, if Scalatest is loaded first and I use some class from the Scala library, I get a: java.lang.ClassNotFoundException: scala.reflect.io.JavaToolsPlatformArchive

To reproduce:
- start with the Scala Maven archetype (org.apache.flink:flink-quickstart-scala:1.8.0)
- in the POM, add a Scalatest dependency with test scope, before the Flink dependencies (org.scalatest:scalatest_${scala.binary.version}:3.0.4:test)
- in StreamingJob, add: env.fromElements[List[String]]()

I got a similar issue using Scala 2.12.7: java.lang.ClassNotFoundException: scala.reflect.internal.SymbolTable$ReflectStats

It works when changing the Flink version to 1.7.2. It also works if Flink is loaded first, but this can be a bit harder to ensure sometimes (our own POM has a few profile definitions).

I also managed to make it work by forcing the following dependency: org.scala-lang:scala-reflect:${scala.version}. Looking at the dependency tree, it looks like Flink needs the most recent version of scala-reflect but somehow doesn't enforce it. When Scalatest is loaded first, the version it declares (wich is slightly older: 2.11.11 or 2.12.3) gets used instead.



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