Hi Johan, thank you so much for your answer!

I read the section of the doc that you said, but I could not resolve my 
issue. 
I think that the problem doesn't come from configuration files (but i may 
be wrong).
I'll try to explain what I mean better: in this example [ 
http://www.lightbend.com/activator/template/akka-sample-main-java ] with 
source code [ 
https://github.com/akka/akka/tree/master/akka-samples/akka-sample-main-java ], 

you can run akka (from main) even if you don't write any application.conf , 
just 
accepting default configurations. But if I try to do the same thing 
starting the bundle (that is, putting no conf files in the jar) with the 
activator I wrote, I have this exception:

Caused by: com.typesafe.config.ConfigException$Missing: No configuration 
setting found for key 'akka'
  at com.typesafe.config.impl.SimpleConfig.findKeyOrNull(SimpleConfig.java:
152)[327:com.example.akka-poc-bundle:0.0.1]
   at com.typesafe.config.impl.SimpleConfig.findKey(SimpleConfig.java:145)[
327:com.example.akka-poc-bundle:0.0.1]
 at com.typesafe.config.impl.SimpleConfig.findOrNull(SimpleConfig.java:172)[
327:com.example.akka-poc-bundle:0.0.1]
      at com.typesafe.config.impl.SimpleConfig.find(SimpleConfig.java:184)[
327:com.example.akka-poc-bundle:0.0.1]
    at com.typesafe.config.impl.SimpleConfig.find(SimpleConfig.java:189)[327
:com.example.akka-poc-bundle:0.0.1]
    at com.typesafe.config.impl.SimpleConfig.getString(SimpleConfig.java:246
)[327:com.example.akka-poc-bundle:0.0.1]
       at akka.actor.ActorSystem$Settings.<init>(ActorSystem.scala:168)[327:
com.example.akka-poc-bundle:0.0.1]
at akka.actor.ActorSystemImpl.<init>(ActorSystem.scala:522)[327:com.example.
akka-poc-bundle:0.0.1]
     at akka.actor.ActorSystem$.apply(ActorSystem.scala:142)[327:com.example
.akka-poc-bundle:0.0.1]
 at akka.actor.ActorSystem$.apply(ActorSystem.scala:126)[327:com.example.
akka-poc-bundle:0.0.1]
 at akka.osgi.OsgiActorSystemFactory.createActorSystem(
OsgiActorSystemFactory.scala:32)[327:com.example.akka-poc-bundle:0.0.1]
  at akka.osgi.ActorSystemActivator.start(ActorSystemActivator.scala:42)[327
:com.example.akka-poc-bundle:0.0.1]
  at org.apache.felix.framework.util.SecureAction.startActivator(
SecureAction.java:697)[org.apache.felix.framework-5.4.0.jar:]
   at org.apache.felix.framework.Felix.activateBundle(Felix.java:2226)[org.
apache.felix.framework-5.4.0.jar:]
     ... 16 more



Il giorno martedì 20 settembre 2016 15:57:33 UTC+2, Johan Andrén ha scritto:
>
> Hi Daniele,
>
> Read this section of the docs! 
>
> http://doc.akka.io/docs/akka/2.4/general/configuration.html#when-using-jarjar-onejar-assembly-or-any-jar-bundler
>
> --
> Johan Andrén
> Akka Team
>
> On Tuesday, September 20, 2016 at 3:44:58 PM UTC+2, Daniele Ascione wrote:
>>
>> I looked in the Akka User List for a long time, but I coudn't find 
>> anything which helped me in this situation. Sorry if this is a duplicated 
>> answer.
>> I'm trying to create an akka "Hello World" bundle (inspired by the this 
>> example 
>> <https://github.com/akka/akka/tree/master/akka-samples/akka-sample-main-java>),
>>  
>> and I'm trying to start it in Karaf.
>> I wrote this *activator *in java: 
>> public class AkkaActivator extends ActorSystemActivator {
>>
>> ActorSystem actorSystem; 
>> ActorRef actorRef;
>> @Override
>> public void configure(BundleContext context, ActorSystem system) {
>> Config regularConfig = ConfigFactory.load();
>> String sysName = system.name();
>> ActorSystem.apply(sysName, regularConfig);
>> actorRef = system.actorOf(Props.create(HelloWorld.class), "helloWorld");
>> system.actorOf(Props.create(Terminator.class, actorRef), "terminator");
>> }
>>
>> }
>>
>>  , which I deployed in a jar using the maven-bundle-plugin 
>> <http://felix.apache.org/documentation/subprojects/apache-felix-maven-bundle-plugin-bnd.html>
>> .
>> I wrote also a *reference.conf* file which is inserted by maven plugin 
>> in the root of the created jar. The file is the following one:
>>   
>> akka {
>>   loglevel = INFO
>> }
>>
>>
>> All the code is avaible in this repo 
>> <https://bitbucket.org/audhumla/akka-osgi/overview>.
>> When I try to start the bundle from karaf, I obtain the following 
>> exception:
>>
>> 2016-09-20 15:20:15,560 | ERROR | nsole user karaf | ShellUtil           
>>              | 44 - org.apache.karaf.shell.core - 4.0.5 | Exception caught 
>> while executing command
>> org.apache.karaf.shell.support.MultiException: Error executing command on 
>> bundles:
>> Error starting bundle 327: Activator start error in bundle 
>> com.example.akka-poc-bundle [327].
>> at 
>> org.apache.karaf.shell.support.MultiException.throwIf(MultiException.java:61)
>> at 
>> org.apache.karaf.bundle.command.BundlesCommand.doExecute(BundlesCommand.java:69)[24:org.apache.karaf.bundle.core:4.0.5]
>> at 
>> org.apache.karaf.bundle.command.BundlesCommand.execute(BundlesCommand.java:54)[24:org.apache.karaf.bundle.core:4.0.5]
>> at 
>> org.apache.karaf.shell.impl.action.command.ActionCommand.execute(ActionCommand.java:83)[44:org.apache.karaf.shell.core:4.0.5]
>> at 
>> org.apache.karaf.shell.impl.console.osgi.secured.SecuredCommand.execute(SecuredCommand.java:67)[44:org.apache.karaf.shell.core:4.0.5]
>> at 
>> org.apache.karaf.shell.impl.console.osgi.secured.SecuredCommand.execute(SecuredCommand.java:87)[44:org.apache.karaf.shell.core:4.0.5]
>> at 
>> org.apache.felix.gogo.runtime.Closure.executeCmd(Closure.java:480)[44:org.apache.karaf.shell.core:4.0.5]
>> at 
>> org.apache.felix.gogo.runtime.Closure.executeStatement(Closure.java:406)[44:org.apache.karaf.shell.core:4.0.5]
>> at 
>> org.apache.felix.gogo.runtime.Pipe.run(Pipe.java:108)[44:org.apache.karaf.shell.core:4.0.5]
>> at 
>> org.apache.felix.gogo.runtime.Closure.execute(Closure.java:182)[44:org.apache.karaf.shell.core:4.0.5]
>> at 
>> org.apache.felix.gogo.runtime.Closure.execute(Closure.java:119)[44:org.apache.karaf.shell.core:4.0.5]
>> at 
>> org.apache.felix.gogo.runtime.CommandSessionImpl.execute(CommandSessionImpl.java:94)[44:org.apache.karaf.shell.core:4.0.5]
>> at 
>> org.apache.karaf.shell.impl.console.ConsoleSessionImpl.run(ConsoleSessionImpl.java:270)[44:org.apache.karaf.shell.core:4.0.5]
>> at java.lang.Thread.run(Thread.java:745)[:1.8.0_91]
>> Caused by: java.lang.Exception: Error starting bundle 327: Activator 
>> start error in bundle com.example.akka-poc-bundle [327].
>> at 
>> org.apache.karaf.bundle.command.BundlesCommand.doExecute(BundlesCommand.java:66)[24:org.apache.karaf.bundle.core:4.0.5]
>> ... 12 more
>> Caused by: org.osgi.framework.BundleException: Activator start error in 
>> bundle com.example.akka-poc-bundle [327].
>> at 
>> org.apache.felix.framework.Felix.activateBundle(Felix.java:2276)[org.apache.felix.framework-5.4.0.jar:]
>> at 
>> org.apache.felix.framework.Felix.startBundle(Felix.java:2144)[org.apache.felix.framework-5.4.0.jar:]
>> at 
>> org.apache.felix.framework.BundleImpl.start(BundleImpl.java:998)[org.apache.felix.framework-5.4.0.jar:]
>> at 
>> org.apache.karaf.bundle.command.Start.executeOnBundle(Start.java:38)[24:org.apache.karaf.bundle.core:4.0.5]
>> at 
>> org.apache.karaf.bundle.command.BundlesCommand.doExecute(BundlesCommand.java:64)[24:org.apache.karaf.bundle.core:4.0.5]
>> ... 12 more
>> Caused by: com.typesafe.config.ConfigException$Missing: No configuration 
>> setting found for key 'akka.version'
>> at 
>> com.typesafe.config.impl.SimpleConfig.findKeyOrNull(SimpleConfig.java:152)[327:com.example.akka-poc-bundle:0.0.1]
>> at 
>> com.typesafe.config.impl.SimpleConfig.findOrNull(SimpleConfig.java:170)[327:com.example.akka-poc-bundle:0.0.1]
>> at 
>> com.typesafe.config.impl.SimpleConfig.findOrNull(SimpleConfig.java:176)[327:com.example.akka-poc-bundle:0.0.1]
>> at 
>> com.typesafe.config.impl.SimpleConfig.find(SimpleConfig.java:184)[327:com.example.akka-poc-bundle:0.0.1]
>> at 
>> com.typesafe.config.impl.SimpleConfig.find(SimpleConfig.java:189)[327:com.example.akka-poc-bundle:0.0.1]
>> at 
>> com.typesafe.config.impl.SimpleConfig.getString(SimpleConfig.java:246)[327:com.example.akka-poc-bundle:0.0.1]
>> at 
>> akka.actor.ActorSystem$Settings.<init>(ActorSystem.scala:168)[327:com.example.akka-poc-bundle:0.0.1]
>> at 
>> akka.actor.ActorSystemImpl.<init>(ActorSystem.scala:522)[327:com.example.akka-poc-bundle:0.0.1]
>> at 
>> akka.actor.ActorSystem$.apply(ActorSystem.scala:142)[327:com.example.akka-poc-bundle:0.0.1]
>> at 
>> akka.actor.ActorSystem$.apply(ActorSystem.scala:126)[327:com.example.akka-poc-bundle:0.0.1]
>> at 
>> akka.osgi.OsgiActorSystemFactory.createActorSystem(OsgiActorSystemFactory.scala:32)[327:com.example.akka-poc-bundle:0.0.1]
>> at 
>> akka.osgi.ActorSystemActivator.start(ActorSystemActivator.scala:42)[327:com.example.akka-poc-bundle:0.0.1]
>> at 
>> org.apache.felix.framework.util.SecureAction.startActivator(SecureAction.java:697)[org.apache.felix.framework-5.4.0.jar:]
>> at 
>> org.apache.felix.framework.Felix.activateBundle(Felix.java:2226)[org.apache.felix.framework-5.4.0.jar:]
>> ... 16 more
>> I noticed that if I modify the reference.conf file adding the line:
>> version = 2.4.10
>> Instead of getting:
>> No configuration setting found for key 'akka.version'
>> I obtain:
>> No configuration setting found for key 'akka.actor'
>>
>> I could I solve this problem?
>>
>>
>>

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