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I am new to Scala and Akka so forgive me if this is a newb question, but I can't find the answer anywhere else... For the record I am using Scala 2.9.0-1 and Akka 1.1.3 and have included my SBT 0.10.1 setup as well. I have written the code that follows this message as an experiment in Akka; it is a toy version of a user database and registration facilities. The basic idea is there is an ActorPool of UserServer actors each of which have an instance of a MemoryUserDatabase which uses STM to interact with a Map of Users keyed off the users' email addresses - pretty simple, right? The problem can be reproduced by compiling the file and running the following in two separate consoles: Console #1: import toy.service.user._; ServiceRunner.run Console #2: import toy.service.user._; ClientRunner.run This is the output from the server console (#1) Aug 31, 2011 5:21:29 PM org.multiverse.api.GlobalStmInstance <clinit> INFO: Initializing GlobalStmInstance using factoryMethod 'org.multiverse.stms.alpha.AlphaStm.createFast'. Aug 31, 2011 5:21:29 PM org.multiverse.stms.alpha.AlphaStm <init> INFO: Created a new AlphaStm instance Aug 31, 2011 5:21:29 PM org.multiverse.api.GlobalStmInstance <clinit> INFO: Successfully initialized GlobalStmInstance using factoryMethod 'org.multiverse.stms.alpha.AlphaStm.createFast'. [ERROR] [8/31/11 5:21 PM] [akka:event-driven:dispatcher:global-3] [LocalActorRef] Availability(foo) java.lang.NoClassDefFoundError: Could not initialize class toy.service.user.memory.MemoryUserDatabase$ at toy.service.user.memory.MemoryUserDatabase$$anonfun$getUser$1.apply(Registration.scala:96) at toy.service.user.memory.MemoryUserDatabase$$anonfun$getUser$1.apply(Registration.scala:96) at toy.service.user.memory.MemoryUserDatabase$$anonfun$getUser$2.apply(Registration.scala:96) at toy.service.

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