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https://issues.apache.org/jira/browse/KARAF-2275?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13636152#comment-13636152
]
Dmitry Konstantinov commented on KARAF-2275:
--------------------------------------------
Yes, the problem was reproduced only once. Karaf is starting, we have a
separate monitoring thread is run during a blueprint bean activation. This
thread try to find bundles for installed features using FeaturesService:
{code}
private Feature findFeatureByBundle(Bundle bundle) throws Exception {
for (Feature feature : featuresService.listFeatures()) {
for (BundleInfo bundleInfo : feature.getBundles()) {
if (bundleInfo.getLocation().equals(bundle.getLocation())) {
return feature;
}
}
}
return null;
}
{code}
This code is invoked by the following code:
{code}
public void addModuleActivator(ServiceReference moduleActivatorReference) {
try {
Bundle moduleBundle = moduleActivatorReference.getBundle();
Feature feature = findFeatureByBundle(moduleBundle);
{code}
where addModuleActivator is a service tracking method configured via blueprint:
{code}
<reference-list id="moduleActivators"
interface="com.my.applied.code.api.ModuleActivator"
availability="optional">
<reference-listener ref="moduleActivatorTracker"
bind-method="addModuleActivator"
unbind-method="removeModuleActivator" />
</reference-list>
{code}
It's looks like FeaturesService is not thread-safe, the internal state is not
guarded by any locks and thread-safe collections are not used to hold it
> ConcurrentModificationException from FeaturesService#listFeatures()
> -------------------------------------------------------------------
>
> Key: KARAF-2275
> URL: https://issues.apache.org/jira/browse/KARAF-2275
> Project: Karaf
> Issue Type: Bug
> Components: karaf-feature
> Affects Versions: 2.3.1
> Environment: Windows 7, x64
> java version "1.6.0_24"
> Java(TM) SE Runtime Environment (build 1.6.0_24-b07)
> Java HotSpot(TM) 64-Bit Server VM (build 19.1-b02, mixed mode)
> Karaf 2.3.1
> Reporter: Dmitry Konstantinov
>
> {noformat}
> java.util.ConcurrentModificationException
> at
> java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)[:1.6.0_30]
> at java.util.HashMap$ValueIterator.next(HashMap.java:822)[:1.6.0_30]
> at
> org.apache.karaf.features.internal.FeaturesServiceImpl.getFeatures(FeaturesServiceImpl.java:1066)
> at
> org.apache.karaf.features.internal.FeaturesServiceImpl.listFeatures(FeaturesServiceImpl.java:989)
> at Proxyd0eb59e8_9c93_47ae_ac94_2f2421663dc8.listFeatures(Unknown
> Source)
> {noformat}
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