This is what I have in the pom

<dependency>

      <groupId>io.kamon</groupId>

      <artifactId>kamon-core_2.11</artifactId>

      <version>0.3.5</version>

    </dependency>

    <dependency>

      <groupId>io.kamon</groupId>

      <artifactId>kamon-log-reporter_2.11</artifactId>

      <version>0.3.5</version>

    </dependency>

<plugin>

        <groupId>org.apache.maven.plugins</groupId>

        <artifactId>maven-surefire-plugin</artifactId>

        <version>2.18.1</version>

        <configuration>

          <argLine>-javaagent:<path to aspectjweaver-1.7.4.jar></argLine>

        </configuration>

      </plugin>


and in my application.conf 


extensions = ["kamon.metric.Metrics"]


a test like will cause the error to happen.

 @Test

    public void testForFoo() {

        final TestActorRef<FooActor> ref = TestActorRef.create(system, 
Props.create(FooActor.class), "testFoo");

        Object obj = ref.underlyingActor().testFoo(ByteString.fromArray(
"abc".getBytes()));

    }


On Friday, May 8, 2015 at 4:47:36 AM UTC-7, Ivan Topolnjak wrote:
>
> Hello TS,
>
> I have been trying to find some additional info regarding this issue, but 
> couldn't find anything yet :(... is it possible for you to provide us a 
> little example to reproduce the issue?
>
> On Fri, May 8, 2015 at 2:59 AM TS <test.te...@gmail.com <javascript:>> 
> wrote:
>
>> Ivan, Any updates on this. Thanks in advance.
>>
>>
>> On Wednesday, May 6, 2015 at 11:05:54 AM UTC-7, TS wrote:
>>>
>>> Ivan, Sorry about the cross post. I was not sure where I should post. I 
>>> am using Kamon 0.3.5
>>>
>>> On Wednesday, May 6, 2015 at 5:51:27 AM UTC-7, Ivan Topolnjak wrote:
>>>>
>>>> Hello TS!
>>>>
>>>> I just replied to you other email, please disregard that thread and 
>>>> post your answer here.. what Kamon version are you using?
>>>>
>>>> On Wed, May 6, 2015 at 3:07 AM TS <test.te...@gmail.com> wrote:
>>>>
>>>>> I just started using Kamon. I am getting an error while weaving (This 
>>>>> happens when my tests run. My surefire plugin has argLine with javaagent 
>>>>> pointing to aspectjweaver.jar
>>>>>
>>>>> Any words of wisdom would be appreciated. 
>>>>>
>>>>> Thanks in advance,
>>>>>
>>>>> TS
>>>>>
>>>>> java.lang.Exception: Unexpected exception, 
>>>>> expected<java.lang.ClassCastException> but 
>>>>> was<java.lang.IncompatibleClassChangeError>
>>>>>
>>>>> at 
>>>>> akka.instrumentation.ActorCellInstrumentation.afterCreation(ActorCellInstrumentation.scala:42)
>>>>>
>>>>> at akka.actor.ActorCell.<init>(ActorCell.scala:397)
>>>>>
>>>>> at akka.actor.LocalActorRef.newActorCell(ActorRef.scala:320)
>>>>>
>>>>> at akka.actor.LocalActorRef.<init>(ActorRef.scala:316)
>>>>>
>>>>> at 
>>>>> akka.actor.LocalActorRefProvider$$anon$1.<init>(ActorRefProvider.scala:574)
>>>>>
>>>>> at 
>>>>> akka.actor.LocalActorRefProvider.rootGuardian$lzycompute(ActorRefProvider.scala:574)
>>>>>
>>>>> at 
>>>>> akka.actor.LocalActorRefProvider.rootGuardian(ActorRefProvider.scala:573)
>>>>>
>>>>> at akka.actor.LocalActorRefProvider.init(ActorRefProvider.scala:628)
>>>>>
>>>>> at akka.actor.ActorSystemImpl.liftedTree2$1(ActorSystem.scala:663)
>>>>>
>>>>> at akka.actor.ActorSystemImpl._start$lzycompute(ActorSystem.scala:660)
>>>>>
>>>>> at akka.actor.ActorSystemImpl._start(ActorSystem.scala:660)
>>>>>
>>>>> at akka.actor.ActorSystemImpl.start(ActorSystem.scala:676)
>>>>>
>>>>> at akka.actor.ActorSystem$.apply(ActorSystem.scala:143)
>>>>>
>>>>> at akka.actor.ActorSystem$.apply(ActorSystem.scala:110)
>>>>>
>>>>> at akka.actor.ActorSystem$.create(ActorSystem.scala:58)
>>>>>
>>>>> at akka.actor.ActorSystem.create(ActorSystem.scala:1)
>>>>>
>>>>> -- 
>>>>> >>>>>>>>>> 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
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>>>>>
>>>>  -- 
>> >>>>>>>>>> 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
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>

-- 
>>>>>>>>>>      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
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