Hi,
I am facing a serious problem in Apache SCR 2.0.2: I have a component that
requires a valid configuration. Unfortunatley, it sometimes happens that the
component gets instantiated twice. I am using Eclipse Equinox
3.10.2.v20150203-1939, Felix ConfigAdmin 1.8.8 and Apache Fileinstall 3.5.2.
This is my component description created by the Apache SCR Plugin:
<?xml version="1.0" encoding="UTF-8"?>
<scr:component xmlns:scr="http://www.osgi.org/xmlns/scr/v1.2.0";
immediate="true" name="com.example.nodes.tree.impl.component.Component"
configuration-policy="require" activate="activate" deactivate="deactivate">
<implementation class="com.example.nodes.tree.impl.component.Component"/>
<service servicefactory="false">
<provide interface="com.example.nodes.tree.Tree"/>
<provide interface="com.example.nodes.tree.HandlerService"/>
</service>
<property name="service.pid"
value="com.example.nodes.tree.impl.component.Component"/>
<reference name="TreeEventListener"
interface="com.example.nodes.tree.eventing.TreeEventListener"
cardinality="0..n" policy="dynamic" bind="bind" unbind="unbind"
updated="updated"/>
<reference name="DataHandler"
interface="com.example.nodes.tree.spi.handler.DataHandler" cardinality="0..n"
policy="dynamic" bind="bind" unbind="unbind" updated="updated"/>
<reference name="ExecuteHandler"
interface="com.example.nodes.tree.spi.handler.ExecuteHandler"
cardinality="0..n" policy="dynamic" bind="bind" unbind="unbind"
updated="updated"/>
</scr:component>
com.example.nodes.tree.impl.component.Component.cfg (no factory configuration):
locking.aquireTimeout.value = 30
locking.aquireTimeout.unit = SECONDS
It is hard to debug. At the moment, I can only offer you the following two
stack traces. As you can see SCR seems to be triggered twice. The first event
comes from the framework and signals a bundle change. The second event informs
SCR about the corresponding configuration creation. It must be a race condition
in some place.
at
com.example.nodes.tree.impl.component.Component.activate(Component.java:54)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at
org.apache.felix.scr.impl.helper.BaseMethod.invokeMethod(BaseMethod.java:222)
at
org.apache.felix.scr.impl.helper.BaseMethod.access$500(BaseMethod.java:37)
at
org.apache.felix.scr.impl.helper.BaseMethod$Resolved.invoke(BaseMethod.java:615)
at
org.apache.felix.scr.impl.helper.BaseMethod.invoke(BaseMethod.java:499)
at
org.apache.felix.scr.impl.helper.ActivateMethod.invoke(ActivateMethod.java:295)
at
org.apache.felix.scr.impl.manager.SingleComponentManager.createImplementationObject(SingleComponentManager.java:302)
at
org.apache.felix.scr.impl.manager.SingleComponentManager.createComponent(SingleComponentManager.java:113)
at
org.apache.felix.scr.impl.manager.SingleComponentManager.getService(SingleComponentManager.java:866)
at
org.apache.felix.scr.impl.manager.SingleComponentManager.getServiceInternal(SingleComponentManager.java:833)
at
org.apache.felix.scr.impl.manager.SingleComponentManager.getService(SingleComponentManager.java:774)
at
org.eclipse.osgi.internal.serviceregistry.ServiceFactoryUse$1.run(ServiceFactoryUse.java:212)
at java.security.AccessController.doPrivileged(Native Method)
at
org.eclipse.osgi.internal.serviceregistry.ServiceFactoryUse.factoryGetService(ServiceFactoryUse.java:210)
at
org.eclipse.osgi.internal.serviceregistry.ServiceFactoryUse.getService(ServiceFactoryUse.java:111)
at
org.eclipse.osgi.internal.serviceregistry.ServiceConsumer$2.getService(ServiceConsumer.java:45)
at
org.eclipse.osgi.internal.serviceregistry.ServiceRegistrationImpl.getService(ServiceRegistrationImpl.java:496)
at
org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.getService(ServiceRegistry.java:461)
at
org.eclipse.osgi.internal.framework.BundleContextImpl.getService(BundleContextImpl.java:619)
at
org.apache.felix.scr.impl.manager.SingleRefPair.getServiceObject(SingleRefPair.java:72)
at
org.apache.felix.scr.impl.helper.BindMethod.getServiceObject(BindMethod.java:646)
at
org.apache.felix.scr.impl.manager.DependencyManager.getServiceObject(DependencyManager.java:2137)
at
org.apache.felix.scr.impl.manager.DependencyManager$SingleStaticCustomizer.prebind(DependencyManager.java:1048)
at
org.apache.felix.scr.impl.manager.DependencyManager.prebind(DependencyManager.java:1457)
at
org.apache.felix.scr.impl.manager.AbstractComponentManager.collectDependencies(AbstractComponentManager.java:983)
at
org.apache.felix.scr.impl.manager.SingleComponentManager.getServiceInternal(SingleComponentManager.java:812)
at
org.apache.felix.scr.impl.manager.AbstractComponentManager.activateInternal(AbstractComponentManager.java:724)
at
org.apache.felix.scr.impl.manager.DependencyManager$SingleStaticCustomizer.addedService(DependencyManager.java:954)
at
org.apache.felix.scr.impl.manager.DependencyManager$SingleStaticCustomizer.addedService(DependencyManager.java:915)
at
org.apache.felix.scr.impl.manager.ServiceTracker$Tracked.customizerAdded(ServiceTracker.java:1215)
at
org.apache.felix.scr.impl.manager.ServiceTracker$Tracked.customizerAdded(ServiceTracker.java:1136)
at
org.apache.felix.scr.impl.manager.ServiceTracker$AbstractTracked.trackAdding(ServiceTracker.java:945)
at
org.apache.felix.scr.impl.manager.ServiceTracker$AbstractTracked.track(ServiceTracker.java:881)
at
org.apache.felix.scr.impl.manager.ServiceTracker$Tracked.serviceChanged(ServiceTracker.java:1167)
at
org.apache.felix.scr.impl.BundleComponentActivator$ListenerInfo.serviceChanged(BundleComponentActivator.java:120)
at
org.eclipse.osgi.internal.serviceregistry.FilteredServiceListener.serviceChanged(FilteredServiceListener.java:109)
at
org.eclipse.osgi.internal.framework.BundleContextImpl.dispatchEvent(BundleContextImpl.java:914)
at
org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:230)
at
org.eclipse.osgi.framework.eventmgr.ListenerQueue.dispatchEventSynchronous(ListenerQueue.java:148)
at
org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.publishServiceEventPrivileged(ServiceRegistry.java:862)
at
org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.publishServiceEvent(ServiceRegistry.java:801)
at
org.eclipse.osgi.internal.serviceregistry.ServiceRegistrationImpl.register(ServiceRegistrationImpl.java:127)
at
org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.registerService(ServiceRegistry.java:225)
at
org.eclipse.osgi.internal.framework.BundleContextImpl.registerService(BundleContextImpl.java:464)
at
org.apache.felix.scr.impl.manager.AbstractComponentManager$3.register(AbstractComponentManager.java:869)
at
org.apache.felix.scr.impl.manager.AbstractComponentManager$3.register(AbstractComponentManager.java:857)
at
org.apache.felix.scr.impl.manager.RegistrationManager.changeRegistration(RegistrationManager.java:133)
at
org.apache.felix.scr.impl.manager.AbstractComponentManager.registerService(AbstractComponentManager.java:915)
at
org.apache.felix.scr.impl.manager.AbstractComponentManager.activateInternal(AbstractComponentManager.java:715)
at
org.apache.felix.scr.impl.manager.AbstractComponentManager.enable(AbstractComponentManager.java:399)
at
org.apache.felix.scr.impl.config.ConfigurableComponentHolder.enableComponents(ConfigurableComponentHolder.java:676)
at
org.apache.felix.scr.impl.BundleComponentActivator.initialEnable(BundleComponentActivator.java:339)
at
org.apache.felix.scr.impl.Activator.loadComponents(Activator.java:360)
at org.apache.felix.scr.impl.Activator.access$000(Activator.java:53)
at
org.apache.felix.scr.impl.Activator$ScrExtension.start(Activator.java:260)
at
org.apache.felix.utils.extender.AbstractExtender.createExtension(AbstractExtender.java:259)
at
org.apache.felix.utils.extender.AbstractExtender.modifiedBundle(AbstractExtender.java:232)
at
org.osgi.util.tracker.BundleTracker$Tracked.customizerModified(BundleTracker.java:482)
at
org.osgi.util.tracker.BundleTracker$Tracked.customizerModified(BundleTracker.java:1)
at org.osgi.util.tracker.AbstractTracked.track(AbstractTracked.java:232)
at
org.osgi.util.tracker.BundleTracker$Tracked.bundleChanged(BundleTracker.java:444)
at
org.eclipse.osgi.internal.framework.BundleContextImpl.dispatchEvent(BundleContextImpl.java:902)
at
org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:230)
at
org.eclipse.osgi.framework.eventmgr.ListenerQueue.dispatchEventSynchronous(ListenerQueue.java:148)
at
org.eclipse.osgi.internal.framework.EquinoxEventPublisher.publishBundleEventPrivileged(EquinoxEventPublisher.java:165)
at
org.eclipse.osgi.internal.framework.EquinoxEventPublisher.publishBundleEvent(EquinoxEventPublisher.java:75)
at
org.eclipse.osgi.internal.framework.EquinoxEventPublisher.publishBundleEvent(EquinoxEventPublisher.java:67)
at
org.eclipse.osgi.internal.framework.EquinoxContainerAdaptor.publishModuleEvent(EquinoxContainerAdaptor.java:102)
at org.eclipse.osgi.container.Module.publishEvent(Module.java:466)
at org.eclipse.osgi.container.Module.start(Module.java:457)
at
org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel.incStartLevel(ModuleContainer.java:1582)
at
org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel.incStartLevel(ModuleContainer.java:1562)
at
org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel.doContainerStartLevel(ModuleContainer.java:1533)
at
org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel.dispatchEvent(ModuleContainer.java:1476)
at
org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel.dispatchEvent(ModuleContainer.java:1)
at
org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:230)
at
org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.run(EventManager.java:340)
13:16:08.733 [Start Level: Equinox Container:
a04ce7b3-f0e5-0015-12b9-a18bd35d12e8] DEBUG c.e.n.t.impl.component.Component -
Component successfully created.
at
com.example.nodes.tree.impl.component.Component.activate(Component.java:54)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at
org.apache.felix.scr.impl.helper.BaseMethod.invokeMethod(BaseMethod.java:222)
at
org.apache.felix.scr.impl.helper.BaseMethod.access$500(BaseMethod.java:37)
at
org.apache.felix.scr.impl.helper.BaseMethod$Resolved.invoke(BaseMethod.java:615)
at
org.apache.felix.scr.impl.helper.BaseMethod.invoke(BaseMethod.java:499)
at
org.apache.felix.scr.impl.helper.ActivateMethod.invoke(ActivateMethod.java:295)
at
org.apache.felix.scr.impl.manager.SingleComponentManager.createImplementationObject(SingleComponentManager.java:302)
at
org.apache.felix.scr.impl.manager.SingleComponentManager.createComponent(SingleComponentManager.java:113)
at
org.apache.felix.scr.impl.manager.SingleComponentManager.getService(SingleComponentManager.java:866)
at
org.apache.felix.scr.impl.manager.SingleComponentManager.getServiceInternal(SingleComponentManager.java:833)
at
org.apache.felix.scr.impl.manager.SingleComponentManager.getService(SingleComponentManager.java:774)
at
org.eclipse.osgi.internal.serviceregistry.ServiceFactoryUse$1.run(ServiceFactoryUse.java:212)
at java.security.AccessController.doPrivileged(Native Method)
at
org.eclipse.osgi.internal.serviceregistry.ServiceFactoryUse.factoryGetService(ServiceFactoryUse.java:210)
at
org.eclipse.osgi.internal.serviceregistry.ServiceFactoryUse.getService(ServiceFactoryUse.java:111)
at
org.eclipse.osgi.internal.serviceregistry.ServiceConsumer$2.getService(ServiceConsumer.java:45)
at
org.eclipse.osgi.internal.serviceregistry.ServiceRegistrationImpl.getService(ServiceRegistrationImpl.java:496)
at
org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.getService(ServiceRegistry.java:461)
at
org.eclipse.osgi.internal.framework.BundleContextImpl.getService(BundleContextImpl.java:619)
at
org.apache.felix.scr.impl.manager.SingleRefPair.getServiceObject(SingleRefPair.java:72)
at
org.apache.felix.scr.impl.helper.BindMethod.getServiceObject(BindMethod.java:646)
at
org.apache.felix.scr.impl.manager.DependencyManager.getServiceObject(DependencyManager.java:2137)
at
org.apache.felix.scr.impl.manager.DependencyManager$SingleStaticCustomizer.prebind(DependencyManager.java:1048)
at
org.apache.felix.scr.impl.manager.DependencyManager.prebind(DependencyManager.java:1457)
at
org.apache.felix.scr.impl.manager.AbstractComponentManager.collectDependencies(AbstractComponentManager.java:983)
at
org.apache.felix.scr.impl.manager.SingleComponentManager.getServiceInternal(SingleComponentManager.java:812)
at
org.apache.felix.scr.impl.manager.AbstractComponentManager.activateInternal(AbstractComponentManager.java:724)
at
org.apache.felix.scr.impl.manager.DependencyManager$SingleStaticCustomizer.addedService(DependencyManager.java:954)
at
org.apache.felix.scr.impl.manager.DependencyManager$SingleStaticCustomizer.addedService(DependencyManager.java:915)
at
org.apache.felix.scr.impl.manager.ServiceTracker$Tracked.customizerAdded(ServiceTracker.java:1215)
at
org.apache.felix.scr.impl.manager.ServiceTracker$Tracked.customizerAdded(ServiceTracker.java:1136)
at
org.apache.felix.scr.impl.manager.ServiceTracker$AbstractTracked.trackAdding(ServiceTracker.java:945)
at
org.apache.felix.scr.impl.manager.ServiceTracker$AbstractTracked.track(ServiceTracker.java:881)
at
org.apache.felix.scr.impl.manager.ServiceTracker$Tracked.serviceChanged(ServiceTracker.java:1167)
at
org.apache.felix.scr.impl.BundleComponentActivator$ListenerInfo.serviceChanged(BundleComponentActivator.java:120)
at
org.eclipse.osgi.internal.serviceregistry.FilteredServiceListener.serviceChanged(FilteredServiceListener.java:109)
at
org.eclipse.osgi.internal.framework.BundleContextImpl.dispatchEvent(BundleContextImpl.java:914)
at
org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:230)
at
org.eclipse.osgi.framework.eventmgr.ListenerQueue.dispatchEventSynchronous(ListenerQueue.java:148)
at
org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.publishServiceEventPrivileged(ServiceRegistry.java:862)
at
org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.publishServiceEvent(ServiceRegistry.java:801)
at
org.eclipse.osgi.internal.serviceregistry.ServiceRegistrationImpl.register(ServiceRegistrationImpl.java:127)
at
org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.registerService(ServiceRegistry.java:225)
at
org.eclipse.osgi.internal.framework.BundleContextImpl.registerService(BundleContextImpl.java:464)
at
org.apache.felix.scr.impl.manager.AbstractComponentManager$3.register(AbstractComponentManager.java:869)
at
org.apache.felix.scr.impl.manager.AbstractComponentManager$3.register(AbstractComponentManager.java:857)
at
org.apache.felix.scr.impl.manager.RegistrationManager.changeRegistration(RegistrationManager.java:133)
at
org.apache.felix.scr.impl.manager.AbstractComponentManager.registerService(AbstractComponentManager.java:915)
at
org.apache.felix.scr.impl.manager.AbstractComponentManager.activateInternal(AbstractComponentManager.java:715)
at
org.apache.felix.scr.impl.manager.SingleComponentManager.reconfigure(SingleComponentManager.java:627)
at
org.apache.felix.scr.impl.manager.SingleComponentManager.reconfigure(SingleComponentManager.java:566)
at
org.apache.felix.scr.impl.config.ConfigurableComponentHolder.configurationUpdated(ConfigurableComponentHolder.java:419)
at
org.apache.felix.scr.impl.config.ConfigurationSupport.configurationEvent(ConfigurationSupport.java:391)
at
org.apache.felix.cm.impl.ConfigurationManager$FireConfigurationEvent.sendEvent(ConfigurationManager.java:2046)
at
org.apache.felix.cm.impl.ConfigurationManager$FireConfigurationEvent.run(ConfigurationManager.java:2014)
at org.apache.felix.cm.impl.UpdateThread.run0(UpdateThread.java:143)
at org.apache.felix.cm.impl.UpdateThread.run(UpdateThread.java:110)
at java.lang.Thread.run(Thread.java:745)
13:16:08.749 [CM Event Dispatcher (Fire ConfigurationEvent:
pid=com.example.nodes.tree.impl.component.Component)] DEBUG
c.e.n.t.impl.component.Component - Component successfully created.
This issue is a blocker for me... Can anybody please help me figuring out what
is the problem's source. Maybe the problem is on my side.
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