[FLINK-11920][scala] Reuse java classpath

flink-scala/src/test/scala/org/apache/flink/api/scala/typeutils/EnumValueSerializerUpgradeTest.scala

@@ -192,16 +192,8 @@ object EnumValueSerializerUpgradeTest {
 
  val settings = new GenericRunnerSettings(out.println _)
 
- val classLoader = Thread.currentThread().getContextClassLoader
-
- val urls = classLoader match {
- case urlClassLoader: URLClassLoader =>
- urlClassLoader.getURLs
- case x => throw new IllegalStateException(s"Not possible to extract URLs " +
- s"from class loader $x.")
- }
-
- settings.classpath.value = urls.map(_.toString).mkString(java.io.File.pathSeparator)
+ // use the java classpath so that scala libraries are available to the compiler
+ settings.usejavacp.value = true
  settings.outdir.value = file.getParent
 
  val reporter = new ConsoleReporter(settings)