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https://issues.apache.org/jira/browse/KARAF-2128?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13659458#comment-13659458
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Jean-Baptiste Onofré commented on KARAF-2128:
---------------------------------------------
To fix that, you have to add the following property in etc/config.properties:
org.apache.aries.blueprint.synchronous=true
It's now the default starting from next Karaf 2.3.2 and 3.0.0.RC2, but it
wasn't the case in previous versions.
It means that, previously, some blueprint container were able to start before
some others. Especially, cellar-features was able to start before
cellar-core/cellar-hazelcast, that's why the GroupManager was not yet there.
Thanks to blueprint.synchronous=true, the blueprint containers are now
synchronous, and so cellar-features will start only when
cellar-core/cellar-hazelcast are up and running.
> NPE in FeaturesEventHandler
> ---------------------------
>
> Key: KARAF-2128
> URL: https://issues.apache.org/jira/browse/KARAF-2128
> Project: Karaf
> Issue Type: Bug
> Components: cellar-features
> Affects Versions: cellar-3.0.0
> Environment: Windows 8 64-bit
> Reporter: Ryan Moquin
> Assignee: Jean-Baptiste Onofré
>
> I don't know if this is related to the fact that I'm running a distribution I
> created with Cellar pre-installed (I think I've seen this happen when
> installing cellar manually from karaf 3.0.0-SNAPSHOT, but I'll re-check it),
> I see the following error shortly (after this paragraph) after startup
> without having executed anything on Karaf other than to view the log. I
> hooked up a debugger and the groupManager is null. I'm assuming something
> isn't getting initialized properly? I get a similar error in a different
> class if the groups config file doesn't exist (might want to prevent the NPE
> in those cases and either default a value or print a clear error message),
> but I don't have the stacktrace handy. I'll try to get it if you want,
> unless you don't need it.
> 2013-01-18 09:29:17,274 | ERROR | pool-11-thread-9 | EventDispatchTask
> | 13 - org.apache.karaf.cellar.cor
> e - 3.0.0.SNAPSHOT | Error while dispatching task
> java.lang.NullPointerException
> at
> org.apache.karaf.cellar.features.FeaturesEventHandler.handle(FeaturesEventHandler.java:64)[36:org.apache.kara
> f.cellar.features:3.0.0.SNAPSHOT]
> at
> org.apache.karaf.cellar.features.FeaturesEventHandler.handle(FeaturesEventHandler.java:33)[36:org.apache.kara
> f.cellar.features:3.0.0.SNAPSHOT]
> at Proxye81779f6_8100_417b_990b_3dc2dce8c97a.handle(Unknown Source)[:]
> at Proxy20fcbff6_e61b_4560_993f_d0c8c0b67d63.handle(Unknown Source)[:]
> at
> org.apache.karaf.cellar.core.event.EventDispatchTask.run(EventDispatchTask.java:77)[13:org.apache.karaf.cella
> r.core:3.0.0.SNAPSHOT]
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)[:1.7.0_09]
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)[:1.7.0_09]
> at java.lang.Thread.run(Thread.java:722)[:1.7.0_09]
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