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Posted to issues@karaf.apache.org by "J. Brébec (JIRA)" <ji...@apache.org> on 2019/01/07 13:49:00 UTC
[jira] [Created] (KARAF-6074) Race condition between the
FeaturesService and FeatureDeploymentListener
J. Brébec created KARAF-6074:
--------------------------------
Summary: Race condition between the FeaturesService and FeatureDeploymentListener
Key: KARAF-6074
URL: https://issues.apache.org/jira/browse/KARAF-6074
Project: Karaf
Issue Type: Bug
Components: karaf
Affects Versions: 4.2.2
Environment: Karaf 4.2.2 Windows 7 and Equinox
Reporter: J. Brébec
On the first start of a custom Karaf container (4.2.2), the logs shows a log of NPE in FeatureDeploymentListener.
After some analysis of this Exception, it's look like a race condition between the FeaturesService and the FeatureDeploymentListener :
# The FeaturesService starts and launch a provisioning in another thread
# a FeatureDeploymentListener is registered, and call bundleChanged for every bundle installed (the startup bundles)
# It calls FeaturesService.state.requirements and get an empty map
# Updating the root regions in the requirements map fails with an NPE
# Some times later, the deployment task launched at step 1 is started, and FeaturesService.saveState() is called : state.requirements."root region" is initialised
The step 5 is executed in another thread, so it can happens before step 2 (and it works) or after, causing this NPE
Moreover, some methods in FeaturesService assume that state.requirements."root region" exists. There are probably others npe here.
{code:java}
14:37:55.668 ERROR [activator-1-thread-2] Unable to update deployed features for bundle: org.eclipse.osgi - 3.12.100.v20180210-1608
java.lang.NullPointerException: null
at org.apache.karaf.deployer.features.FeatureDeploymentListener.bundleChanged(FeatureDeploymentListener.java:247) [25:org.apache.karaf.deployer.features:4.2.2]
at org.apache.karaf.deployer.features.FeatureDeploymentListener.init(FeatureDeploymentListener.java:95) [25:org.apache.karaf.deployer.features:4.2.2]
at org.apache.karaf.deployer.features.osgi.Activator.doStart(Activator.java:52) [25:org.apache.karaf.deployer.features:4.2.2]
at org.apache.karaf.util.tracker.BaseActivator.run(BaseActivator.java:292) [25:org.apache.karaf.deployer.features:4.2.2]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:?]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:?]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:?]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:?]{code}
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