Hi,    I'm trying to run Akka http on Spark. But it raises exceptions with NoSuchMethodError. The CDH version is 5.7.1   Here's my demo using spark-shell.   $ spark-shell --packages  com.typesafe.akka:akka-http-experimental_2.10:1.0     import akka.actor.ActorSystem import akka.stream.ActorMaterializer import akka.http.scaladsl.Http import akka.http.scaladsl.server.Directives._ implicit val actorSystem = ActorSystem("system") implicit val actorMaterializer = ActorMaterializer() java.lang.NoSuchMethodError: com.typesafe.config.Config.getDuration(Ljava/lang/String;Ljava/util/concurrent/TimeUnit;)J at akka.stream.StreamSubscriptionTimeoutSettings$.apply(ActorMaterializer.scala:346) at akka.stream.ActorMaterializerSettings$.apply(ActorMaterializer.scala:229) at akka.stream.ActorMaterializerSettings$.apply(ActorMaterializer.scala:215) at akka.stream.ActorMaterializer$$anonfun$1.apply(ActorMaterializer.scala:37) at akka.stream.ActorMaterializer$$anonfun$1.apply(ActorMaterializer.scala:37) at scala.Option.getOrElse(Option.scala:120) at akka.stream.ActorMaterializer$.apply(ActorMaterializer.scala:37) at $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:37) at $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:42) at $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:44) at $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:46) at $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:48) at $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:50) at $iwC$$iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:52) at $iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:54) at $iwC$$iwC$$iwC$$iwC.<init>(<console>:56) at $iwC$$iwC$$iwC.<init>(<console>:58) at $iwC$$iwC.<init>(<console>:60) at $iwC.<init>(<console>:62) at <init>(<console>:64) at .<init>(<console>:68) at .<clinit>(<console>) at .<init>(<console>:7) at .<clinit>(<console>) at $print(<console>) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:497) at org.apache.spark.repl.SparkIMain$ReadEvalPrint.call(SparkIMain.scala:1045) at org.apache.spark.repl.SparkIMain$Request.loadAndRun(SparkIMain.scala:1326) at org.apache.spark.repl.SparkIMain.loadAndRunReq$1(SparkIMain.scala:821) at org.apache.spark.repl.SparkIMain.interpret(SparkIMain.scala:852) at org.apache.spark.repl.SparkIMain.interpret(SparkIMain.scala:800) at org.apache.spark.repl.SparkILoop.reallyInterpret$1(SparkILoop.scala:857) at org.apache.spark.repl.SparkILoop.interpretStartingWith(SparkILoop.scala:902) at org.apache.spark.repl.SparkILoop.command(SparkILoop.scala:814) at org.apache.spark.repl.SparkILoop.processLine$1(SparkILoop.scala:657) at org.apache.spark.repl.SparkILoop.innerLoop$1(SparkILoop.scala:665) at org.apache.spark.repl.SparkILoop.org$apache$spark$repl$SparkILoop$$loop(SparkILoop.scala:670) at org.apache.spark.repl.SparkILoop$$anonfun$org$apache$spark$repl$SparkILoop$$process$1.apply$mcZ$sp(SparkILoop.scala:997) at org.apache.spark.repl.SparkILoop$$anonfun$org$apache$spark$repl$SparkILoop$$process$1.apply(SparkILoop.scala:945) at org.apache.spark.repl.SparkILoop$$anonfun$org$apache$spark$repl$SparkILoop$$process$1.apply(SparkILoop.scala:945) at scala.tools.nsc.util.ScalaClassLoader$.savingContextLoader(ScalaClassLoader.scala:135) at org.apache.spark.repl.SparkILoop.org$apache$spark$repl$SparkILoop$$process(SparkILoop.scala:945) at org.apache.spark.repl.SparkILoop.process(SparkILoop.scala:1064) at org.apache.spark.repl.Main$.main(Main.scala:31) at org.apache.spark.repl.Main.main(Main.scala) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:497) at org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:731) at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:181) at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:206) at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:121) at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)    However, I could run my demo locally without Spark, same code and same Akka package.    sbt build setting: scalaVersion := "2.10.5" libraryDependencies ++= Seq( "com.typesafe.akka" % "akka-http-experimental_2.10" % "1.0", "com.typesafe.akka" % "akka-http-spray-json-experimental_2.10" % "1.0", "com.typesafe.akka" %"akka-http-testkit-experimental_2.10" % "1.0", "org.scalatest" %% "scalatest" % "2.2.5" % "test" )   Any ideas would be greatly appreciated!       ... View more