The reason you get that error is what the big red warning in the docs:

"Akka's configuration approach relies heavily on the notion of every 
module/jar having its own reference.conf file, all of these will be 
discovered by the configuration and loaded. Unfortunately this also means 
that if you put/merge multiple jars into the same jar, you need to merge 
all the reference.confs as well. Otherwise all defaults will be lost and 
Akka will not function."


When merging the jar files of many Akka modules reference.conf must be each 
of the reference.conf in the modules merged into a single file and included 
in the superjar (how this is done with the maven plugin you mention I 
cannot say). 

Your application config should be put in application.conf.

--
Johan
Akka Team

On Tuesday, September 20, 2016 at 4:51:56 PM UTC+2, Daniele Ascione wrote:
>
> 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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