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. 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