Hi, 

I am following <Akka in Action> book and cloned code from 
https://github.com/RayRoestenburg/akka-in-action

when executing `sbt assembly` it appeared error as following:


23:09:59.383 [ConsumerTest-akka.actor.default-dispatcher-7] DEBUG 
o.a.camel.impl.DefaultCamelContext - Warming up route id: 
akka://ConsumerTest/user/$d having autoStartup=true
23:09:59.383 [ConsumerTest-akka.actor.default-dispatcher-7] DEBUG 
org.apache.camel.impl.RouteService - Starting services on route: 
akka://ConsumerTest/user/$d
Uncaught error from thread [ConsumerTest-akka.actor.default-dispatcher-7] 
shutting down JVM since 'akka.jvm-exit-on-fatal-error' is enabled for 
ActorSystem[ConsumerTest]
java.lang.NoClassDefFoundError: org/apache/commons/pool/ObjectPoolFactory
    at java.lang.Class.getDeclaredConstructors0(Native Method)
    at java.lang.Class.privateGetDeclaredConstructors(Class.java:2671)
    at java.lang.Class.getConstructor0(Class.java:3075)
    at java.lang.Class.getConstructor(Class.java:1825)
    at 
org.apache.activemq.camel.component.ActiveMQConfiguration.createPooledConnectionFactory(ActiveMQConfiguration.java:180)
    at 
org.apache.activemq.camel.component.ActiveMQConfiguration.createConnectionFactory(ActiveMQConfiguration.java:164)
    at 
org.apache.camel.component.jms.JmsConfiguration.getConnectionFactory(JmsConfiguration.java:521)
    at 
org.apache.camel.component.jms.JmsConfiguration.createListenerConnectionFactory(JmsConfiguration.java:1181)
    at 
org.apache.camel.component.jms.JmsConfiguration.getListenerConnectionFactory(JmsConfiguration.java:540)
    at 
org.apache.camel.component.jms.JmsConfiguration.configureMessageListenerContainer(JmsConfiguration.java:996)
    at 
org.apache.camel.component.jms.JmsConfiguration.createMessageListenerContainer(JmsConfiguration.java:512)
    at 
org.apache.camel.component.jms.JmsEndpoint.createConsumer(JmsEndpoint.java:137)
    at 
org.apache.camel.component.jms.JmsEndpoint.createConsumer(JmsEndpoint.java:56)
    at 
org.apache.camel.impl.EventDrivenConsumerRoute.addServices(EventDrivenConsumerRoute.java:65)
    at 
org.apache.camel.impl.DefaultRoute.onStartingServices(DefaultRoute.java:80)
    at org.apache.camel.impl.RouteService.warmUp(RouteService.java:134)
    at 
org.apache.camel.impl.DefaultCamelContext.doWarmUpRoutes(DefaultCamelContext.java:2304)
    at 
org.apache.camel.impl.DefaultCamelContext.safelyStartRouteServices(DefaultCamelContext.java:2234)
    at 
org.apache.camel.impl.DefaultCamelContext.safelyStartRouteServices(DefaultCamelContext.java:2256)
    at 
org.apache.camel.impl.DefaultCamelContext.startRouteService(DefaultCamelContext.java:2133)
    at 
org.apache.camel.impl.DefaultCamelContext.startRoute(DefaultCamelContext.java:794)
    at 
org.apache.camel.impl.DefaultCamelContext.startRouteDefinitions(DefaultCamelContext.java:2109)
    at 
org.apache.camel.impl.DefaultCamelContext.addRouteDefinitions(DefaultCamelContext.java:726)
    at 
org.apache.camel.builder.RouteBuilder.populateRoutes(RouteBuilder.java:337)
    at 
org.apache.camel.builder.RouteBuilder.addRoutesToCamelContext(RouteBuilder.java:264)
    at 
org.apache.camel.impl.DefaultCamelContext.addRoutes(DefaultCamelContext.java:688)
    at 
akka.camel.internal.ConsumerRegistrar$$anonfun$receive$4.applyOrElse(CamelSupervisor.scala:200)
    at akka.actor.Actor$class.aroundReceive(Actor.scala:484)
    at 
akka.camel.internal.ConsumerRegistrar.aroundReceive(CamelSupervisor.scala:195)
    at akka.actor.ActorCell.receiveMessage(ActorCell.scala:526)
    at akka.actor.ActorCell.invoke(ActorCell.scala:495)
    at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:257)
    at akka.dispatch.Mailbox.run(Mailbox.scala:224)
    at akka.dispatch.Mailbox.exec(Mailbox.scala:234)
    at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
    at 
scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
    at 
scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
    at 
scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
Caused by: java.lang.ClassNotFoundException: 
org.apache.commons.pool.ObjectPoolFactory
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 38 more
23:09:59.430 [ConsumerTest-akka.actor.default-dispatcher-4] ERROR 
akka.actor.ActorSystemImpl - Uncaught error from thread 
[ConsumerTest-akka.actor.default-dispatcher-7] shutting down JVM since 
'akka.jvm-exit-on-fatal-error' is enabled



and I also add the dependence for commons pool lib in build.sbt (in root 
directory)


// https://mvnrepository.com/artifact/commons-pool/commons-pool
libraryDependencies += "commons-pool" % "commons-pool" % "1.3"

so, what should I do? 

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