Seems you're mixing up dependencies. Please don't use 2.3.9, use 2.3.12 (see your akka-actor dependency).
-- Cheers, Konrad 'ktoso’ Malawski Akka @ Typesafe On 29 July 2015 at 22:52:05, [email protected] ([email protected]) wrote: The subject pretty much says it all. I have the following in my pom: <!-- akka --> <dependency> <groupId>com.typesafe.akka</groupId> <artifactId>akka-actor_${scala.binary.version}</artifactId> <version>2.3.9</version> </dependency> <dependency> <groupId>com.typesafe.akka</groupId> <artifactId>akka-slf4j_${scala.binary.version}</artifactId> <version>2.3.12</version> </dependency> <dependency> <groupId>com.typesafe.akka</groupId> <artifactId>akka-stream-experimental_${scala.binary.version}</artifactId> <version>1.0</version> </dependency> <dependency> <groupId>com.typesafe.akka</groupId> <artifactId>akka-http-experimental_${scala.binary.version}</artifactId> <version>1.0</version> </dependency> <dependency> <groupId>com.typesafe.akka</groupId> <artifactId>akka-http-core-experimental_${scala.binary.version}</artifactId> <version>1.0</version> </dependency> <dependency> <groupId>com.typesafe.akka</groupId> <artifactId>akka-http-spray-json-experimental_${scala.binary.version}</artifactId> <version>1.0</version> </dependency> I have a lot of dependencies, but I'm pretty sure I've excluded things such that no other version of akka is being brought in (per mvn dependency:tree). java.lang.NoClassDefFoundError: akka/japi/function/Function at java.net.URLClassLoader$1.run(URLClassLoader.java:372) at java.net.URLClassLoader$1.run(URLClassLoader.java:361) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:360) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:760) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) at java.net.URLClassLoader.defineClass(URLClassLoader.java:455) at java.net.URLClassLoader.access$100(URLClassLoader.java:73) at java.net.URLClassLoader$1.run(URLClassLoader.java:367) at java.net.URLClassLoader$1.run(URLClassLoader.java:361) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:360) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) at akka.stream.Supervision$.<init>(Supervision.scala:58) at akka.stream.Supervision$.<clinit>(Supervision.scala) at akka.stream.ActorMaterializerSettings$.apply(ActorMaterializer.scala:228) at akka.stream.ActorMaterializerSettings$.apply(ActorMaterializer.scala:215) at akka.stream.ActorMaterializer$$anonfun$1.apply(ActorMaterializer.scala:37) at akka.stream.ActorMaterializer$$anonfun$1.apply(ActorMaterializer.scala:37) at scala.Option.getOrElse(Option.scala:121) at akka.stream.ActorMaterializer$.apply(ActorMaterializer.scala:37) at com.twilio.messaging.pricingevent.app.FlowFactoryTestSuite$$anon$1.<init>(FlowFactoryTestSuite.scala:75) at com.twilio.messaging.pricingevent.app.FlowFactoryTestSuite.withFlowFactory(FlowFactoryTestSuite.scala:73) at com.twilio.messaging.pricingevent.app.FlowFactoryTestSuite$$anonfun$1$$anonfun$apply$mcV$sp$1.apply$mcV$sp(FlowFactoryTestSuite.scala:122) at com.twilio.messaging.pricingevent.app.FlowFactoryTestSuite$$anonfun$1$$anonfun$apply$mcV$sp$1.apply(FlowFactoryTestSuite.scala:109) at com.twilio.messaging.pricingevent.app.FlowFactoryTestSuite$$anonfun$1$$anonfun$apply$mcV$sp$1.apply(FlowFactoryTestSuite.scala:109) at org.scalatest.Transformer$$anonfun$apply$1.apply$mcV$sp(Transformer.scala:22) at org.scalatest.OutcomeOf$class.outcomeOf(OutcomeOf.scala:85) at org.scalatest.OutcomeOf$.outcomeOf(OutcomeOf.scala:104) at org.scalatest.Transformer.apply(Transformer.scala:22) at org.scalatest.Transformer.apply(Transformer.scala:20) at org.scalatest.FunSpecLike$$anon$1.apply(FunSpecLike.scala:422) at org.scalatest.Suite$class.withFixture(Suite.scala:1122) at com.twilio.messaging.pricingevent.app.FlowFactoryTestSuite.withFixture(FlowFactoryTestSuite.scala:39) at org.scalatest.FunSpecLike$class.invokeWithFixture$1(FunSpecLike.scala:419) at org.scalatest.FunSpecLike$$anonfun$runTest$1.apply(FunSpecLike.scala:431) at org.scalatest.FunSpecLike$$anonfun$runTest$1.apply(FunSpecLike.scala:431) at org.scalatest.SuperEngine.runTestImpl(Engine.scala:306) at org.scalatest.FunSpecLike$class.runTest(FunSpecLike.scala:431) at com.twilio.messaging.pricingevent.app.FlowFactoryTestSuite.runTest(FlowFactoryTestSuite.scala:39) at org.scalatest.FunSpecLike$$anonfun$runTests$1.apply(FunSpecLike.scala:464) at org.scalatest.FunSpecLike$$anonfun$runTests$1.apply(FunSpecLike.scala:464) at org.scalatest.SuperEngine$$anonfun$traverseSubNodes$1$1.apply(Engine.scala:413) at org.scalatest.SuperEngine$$anonfun$traverseSubNodes$1$1.apply(Engine.scala:401) at scala.collection.immutable.List.foreach(List.scala:381) at org.scalatest.SuperEngine.traverseSubNodes$1(Engine.scala:401) at org.scalatest.SuperEngine.org$scalatest$SuperEngine$$runTestsInBranch(Engine.scala:390) at org.scalatest.SuperEngine$$anonfun$traverseSubNodes$1$1.apply(Engine.scala:427) at org.scalatest.SuperEngine$$anonfun$traverseSubNodes$1$1.apply(Engine.scala:401) at scala.collection.immutable.List.foreach(List.scala:381) at org.scalatest.SuperEngine.traverseSubNodes$1(Engine.scala:401) at org.scalatest.SuperEngine.org$scalatest$SuperEngine$$runTestsInBranch(Engine.scala:396) at org.scalatest.SuperEngine.runTestsImpl(Engine.scala:483) at org.scalatest.FunSpecLike$class.runTests(FunSpecLike.scala:464) at com.twilio.messaging.pricingevent.app.FlowFactoryTestSuite.runTests(FlowFactoryTestSuite.scala:39) at org.scalatest.Suite$class.run(Suite.scala:1424) at com.twilio.messaging.pricingevent.app.FlowFactoryTestSuite.org$scalatest$FunSpecLike$$super$run(FlowFactoryTestSuite.scala:39) at org.scalatest.FunSpecLike$$anonfun$run$1.apply(FunSpecLike.scala:468) at org.scalatest.FunSpecLike$$anonfun$run$1.apply(FunSpecLike.scala:468) at org.scalatest.SuperEngine.runImpl(Engine.scala:545) at org.scalatest.FunSpecLike$class.run(FunSpecLike.scala:468) at com.twilio.messaging.pricingevent.app.FlowFactoryTestSuite.org$scalatest$BeforeAndAfterAll$$super$run(FlowFactoryTestSuite.scala:39) at org.scalatest.BeforeAndAfterAll$class.liftedTree1$1(BeforeAndAfterAll.scala:257) at org.scalatest.BeforeAndAfterAll$class.run(BeforeAndAfterAll.scala:256) at com.twilio.messaging.pricingevent.app.FlowFactoryTestSuite.run(FlowFactoryTestSuite.scala:39) at org.scalatest.junit.JUnitRunner.run(JUnitRunner.scala:99) at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:264) at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:153) at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:124) Any help much appreciated. Thanks! -- >>>>>>>>>> Read the docs: http://akka.io/docs/ >>>>>>>>>> Check the FAQ: >>>>>>>>>> http://doc.akka.io/docs/akka/current/additional/faq.html >>>>>>>>>> Search the archives: https://groups.google.com/group/akka-user --- You received this message because you are subscribed to the Google Groups "Akka User List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/akka-user. For more options, visit https://groups.google.com/d/optout. -- >>>>>>>>>> Read the docs: http://akka.io/docs/ >>>>>>>>>> Check the FAQ: >>>>>>>>>> http://doc.akka.io/docs/akka/current/additional/faq.html >>>>>>>>>> Search the archives: https://groups.google.com/group/akka-user --- You received this message because you are subscribed to the Google Groups "Akka User List" group. 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