Merge pull request #153 from alfonsorr/152-prevent-errors-using-new-v…

…ersions-of-java

Newer versions of java dont accept CMSClassUnloadingEnabled option

build.sbt

@@ -29,7 +29,11 @@ libraryDependencies += "org.scalatest"    %% "scalatest" % "3.2.18"           %
 credentials += Credentials(Path.userHome / ".sbt" / "sonatype_credentials")
 
 Test / fork := true
-javaOptions ++= Seq("-Xms512M", "-Xmx2048M", "-XX:+CMSClassUnloadingEnabled", "-Duser.timezone=GMT")
+javaOptions ++= {
+  Seq("-Xms512M", "-Xmx2048M", "-Duser.timezone=GMT")  ++ (if (System.getProperty("java.version").startsWith("1.8.0"))
+    Seq("-XX:+CMSClassUnloadingEnabled")
+  else Seq.empty)
+}
 
 licenses := Seq("MIT" -> url("http://opensource.org/licenses/MIT"))
 homepage := Some(url("https://github.com/mrpowers-io/spark-fast-tests"))