Hi,
It sounds like a cycle during object creation. iPOJO object are
created when needed by default (if your component provides a
service).
To handle that iPOJO uses OSGi service factories.
The problem sounds to be the following:
- a service is going to be used
- iPOJO creates the pojo object (because, we need it)
- this object can also depending on a service, which may use the one
of the previous ones.... Cycle
To break the cycle, you can set one component to immediate. In that
case, the object will be created eagerly. the big question is :
Which
ones.
If you gives me more detail on your system, I can figure out how to
break the cycle.
Regards,
Clement
On 22.09.2009, at 23:21, Joel Schuster wrote:
I hate sending stack traces but I'm running into a real nasty
issue.
I've tried both Felix 1.8.x and 2.0. I get the same issue. I've
tried various forms of the @Requires annotation.
This problem is sometimes reproducible on two systems but not on
the
third so I'm beginning to suspect a race condition of some sort as
it only manifests some of the time and is sometimes dependant upon
the order of the bundle loading.
I have one bundle that @Requires a collection of instances from
another bundle that implements two different interfaces, also each
in their own bundles. I've created a test set of bundles to see if
the problem comes from the inheritance model, but I can't reproduce
in a smaller example. Yet another reason it feels like a race
condition.
Thoughts?
-> ERROR: EventDispatcher: Error during dispatch.
(java.lang.IllegalStateException: ServiceFactory.getService()
resulted in a cycle.)
java.lang.IllegalStateException: ServiceFactory.getService()
resulted in a cycle.
at
org
.apache
.felix.framework.ServiceRegistry.getService(ServiceRegistry.java:
261)
at org.apache.felix.framework.Felix.getService(Felix.java:2881)
at
org
.apache
.felix
.framework.BundleContextImpl.getService(BundleContextImpl.java:
357)
at
org.apache.felix.ipojo.IPojoContext.getService(IPojoContext.java:
260)
at org.apache.felix.ipojo.util.Tracker.getService(Tracker.java:
434)
at
org
.apache
.felix
.ipojo.util.DependencyModel.ungetService(DependencyModel.java:
917)
at
org
.apache
.felix
.ipojo.util.DependencyModel.manageDeparture(DependencyModel.java:
435)
at
org
.apache
.felix
.ipojo.util.DependencyModel.removedService(DependencyModel.java:
424)
at org.apache.felix.ipojo.util.Tracker
$Tracked.untrack(Tracker.java:
736)
at org.apache.felix.ipojo.util.Tracker
$Tracked.serviceChanged(Tracker.java:636)
at
org
.apache
.felix
.framework
.util
.EventDispatcher
.invokeServiceListenerCallback(EventDispatcher.java:
878)
at
org
.apache
.felix
.framework
.util.EventDispatcher.fireEventImmediately(EventDispatcher.java:
732)
at
org
.apache
.felix
.framework
.util.EventDispatcher.fireServiceEvent(EventDispatcher.java:662)
at
org.apache.felix.framework.Felix.fireServiceEvent(Felix.java:3603)
at org.apache.felix.framework.Felix.access$000(Felix.java:40)
at org.apache.felix.framework.Felix$1.serviceChanged(Felix.java:
624)
at
org
.apache
.felix
.framework.ServiceRegistry.unregisterService(ServiceRegistry.java:
117)
at
org
.apache
.felix
.framework
.ServiceRegistrationImpl.unregister(ServiceRegistrationImpl.java:
128)
at
org
.apache
.felix
.ipojo
.handlers
.providedservice
.ProvidedService.unregisterService(ProvidedService.java:298)
at
org
.apache
.felix
.ipojo
.handlers
.providedservice
.ProvidedServiceHandler.__stateChanged(ProvidedServiceHandler.java:
435)
at
org
.apache
.felix
.ipojo
.handlers
.providedservice
.ProvidedServiceHandler.stateChanged(ProvidedServiceHandler.java)
at
org
.apache.felix.ipojo.InstanceManager.setState(InstanceManager.java:
451)
at
org.apache.felix.ipojo.InstanceManager.stop(InstanceManager.java:
340)
at org.apache.felix.ipojo.util.Property.invoke(Property.java:502)
at
org
.apache
.felix
.ipojo
.handlers
.configuration
.ConfigurationHandler.__onCreation(ConfigurationHandler.java:432)
at
org
.apache
.felix
.ipojo
.handlers
.configuration
.ConfigurationHandler.onCreation(ConfigurationHandler.java)
at
org
.apache
.felix.ipojo.InstanceManager.getPojoObject(InstanceManager.java:
787)
at org.apache.felix.ipojo.handlers.providedservice.ProvidedService
$SingletonStrategy.getService(ProvidedService.java:438)
at
org
.apache
.felix
.ipojo
.handlers
.providedservice.ProvidedService.getService(ProvidedService.java:
263)
at
org
.apache
.felix
.framework
.ServiceRegistrationImpl
.getFactoryUnchecked(ServiceRegistrationImpl.java:293)
at
org
.apache
.felix
.framework
.ServiceRegistrationImpl.getService(ServiceRegistrationImpl.java:
207)
at
org
.apache
.felix.framework.ServiceRegistry.getService(ServiceRegistry.java:
307)
at org.apache.felix.framework.Felix.getService(Felix.java:2881)
at
org
.apache
.felix
.framework.BundleContextImpl.getService(BundleContextImpl.java:
357)
at
org.apache.felix.ipojo.IPojoContext.getService(IPojoContext.java:
260)
at org.apache.felix.ipojo.util.Tracker.getService(Tracker.java:
426)
at
org
.apache
.felix.ipojo.util.DependencyModel.getService(DependencyModel.java:
901)
at
org
.apache
.felix
.ipojo
.handlers
.dependency.Dependency.createServiceObject(Dependency.java:
481)
at
org
.apache
.felix.ipojo.handlers.dependency.Dependency.onGet(Dependency.java:
456)
at
org.apache.felix.ipojo.InstanceManager.onGet(InstanceManager.java:
944)
at
com
.navsys.mcmpge.kearfott.knclient.KNClient.__getcomms(KNClient.java)
at
com.navsys.mcmpge.kearfott.knclient.KNClient.<init>(KNClient.java:
49)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
Method)
at
sun
.reflect
.NativeConstructorAccessorImpl
.newInstance(NativeConstructorAccessorImpl.java:39)
at
sun
.reflect
.DelegatingConstructorAccessorImpl
.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at
org
.apache
.felix.ipojo.InstanceManager.createObject(InstanceManager.java:600)
at
org
.apache
.felix.ipojo.InstanceManager.getPojoObject(InstanceManager.java:
776)
at
org
.apache
.felix
.ipojo
.handlers
.lifecycle
.callback
.LifecycleCallbackHandler
.__stateChanged(LifecycleCallbackHandler.java:156)
at
org
.apache
.felix
.ipojo
.handlers
.lifecycle
.callback
.LifecycleCallbackHandler
.stateChanged(LifecycleCallbackHandler.java)
at
org
.apache.felix.ipojo.InstanceManager.setState(InstanceManager.java:
440)
at
org.apache.felix.ipojo.InstanceManager.start(InstanceManager.java:
321)
at
org
.apache
.felix.ipojo.ComponentFactory.createInstance(ComponentFactory.java:
155)
at
org
.apache
.felix
.ipojo.IPojoFactory.createComponentInstance(IPojoFactory.java:
298)
at
org
.apache
.felix
.ipojo.IPojoFactory.createComponentInstance(IPojoFactory.java:
235)
at
org.apache.felix.ipojo.IPojoFactory.updated(IPojoFactory.java:603)
at org.apache.felix.cm.impl.ConfigurationManager
$UpdateConfiguration.run(ConfigurationManager.java:1460)
at org.apache.felix.cm.impl.UpdateThread.run(UpdateThread.java:88)
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