[ 
https://issues.apache.org/jira/browse/FELIX-2450?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12882597#action_12882597
 ] 

Felix Meschberger commented on FELIX-2450:
------------------------------------------

Thanks for reporting the problem.

Cycles are problematic in itself: I tend to think of cycles as design issues 
(not to say bugs).

Nevertheless, there is an easy solution for you to be able to work around the 
problem in this case, in that you declare one of the components (guessing from 
the name, this would be the "MyItemRegisterImpl" component) to be "immediate".

I wonder why you have the cycle here anyway: Why don't you inject the 
ItemRegister into the Item at the time time Item is bound to the ItemRegister ?

> ServiceFactory.getService() resulted in a cycle.
> ------------------------------------------------
>
>                 Key: FELIX-2450
>                 URL: https://issues.apache.org/jira/browse/FELIX-2450
>             Project: Felix
>          Issue Type: Bug
>          Components: Declarative Services (SCR)
>    Affects Versions:  scr-1.4.0
>         Environment: Linux bono 2.6.32-22-generic #36-Ubuntu SMP Thu Jun 3 
> 22:02:19 UTC 2010 i686 GNU/Linux
> java version "1.6.0_20"
> Java(TM) SE Runtime Environment (build 1.6.0_20-b02)
> Java HotSpot(TM) Client VM (build 16.3-b01, mixed mode, sharing)
>            Reporter: Martin Zdila
>
> I am using 1.4.1.SNAPSHOT-r951313.
> Component "Item":
> <?xml version="1.0" encoding="UTF-8"?>
> <scr:component xmlns:scr="http://www.osgi.org/xmlns/scr/v1.1.0"; 
> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
> xsi:schemaLocation="http://www.osgi.org/xmlns/scr/v1.1.0 
> http://www.osgi.org/xmlns/scr/v1.1.0";>
>       <implementation class="mycompany.impl.MyItemImpl"/>
>       <reference interface="mycompany.ItemRegister" bind="setItemRegister" 
> policy="dynamic"/>
>       <service>
>               <provide interface="mycompany.Item"/>
>       </service>
> </scr:component>
> Component "ItemRegister":
> <?xml version="1.0" encoding="UTF-8"?>
> <scr:component xmlns:scr="http://www.osgi.org/xmlns/scr/v1.1.0"; 
> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
> xsi:schemaLocation="http://www.osgi.org/xmlns/scr/v1.1.0 
> http://www.osgi.org/xmlns/scr/v1.1.0";>
>       <implementation class="mycompany.impl.MyItemRegisterImpl"/>
>       <reference interface="mycompany.Item" bind="addItem" 
> unbind="removeItem" cardinality="0..n" policy="dynamic"/>
>       <service>
>               <provide interface="mycompany.ItemRegister"/>
>       </service>
> </scr:component>
> Both components reside in the same bundle. On bundle startup I am getting:
> java.lang.IllegalStateException: ServiceFactory.getService() resulted in a 
> cycle.
>       at 
> org.apache.felix.framework.ServiceRegistry.getService(ServiceRegistry.java:249)
>       at org.apache.felix.framework.Felix.getService(Felix.java:3022)
>       at 
> org.apache.felix.framework.BundleContextImpl.getService(BundleContextImpl.java:329)
>       at 
> org.apache.felix.scr.impl.manager.DependencyManager.getService(DependencyManager.java:785)
>       at 
> org.apache.felix.scr.impl.manager.DependencyManager$1.getInstance(DependencyManager.java:1040)
>       at 
> org.apache.felix.scr.impl.helper.BindMethod.getParameters(BindMethod.java:436)
>       at 
> org.apache.felix.scr.impl.helper.BaseMethod.invokeMethod(BaseMethod.java:213)
>       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:550)
>       at 
> org.apache.felix.scr.impl.helper.BaseMethod$NotResolved.invoke(BaseMethod.java:508)
>       at 
> org.apache.felix.scr.impl.helper.BaseMethod.invoke(BaseMethod.java:442)
>       at 
> org.apache.felix.scr.impl.manager.DependencyManager.invokeBindMethod(DependencyManager.java:1028)
>       at 
> org.apache.felix.scr.impl.manager.DependencyManager.bind(DependencyManager.java:944)
>       at 
> org.apache.felix.scr.impl.manager.DependencyManager.open(DependencyManager.java:868)
>       at 
> org.apache.felix.scr.impl.manager.ImmediateComponentManager.createImplementationObject(ImmediateComponentManager.java:200)
>       at 
> org.apache.felix.scr.impl.manager.ImmediateComponentManager.createComponent(ImmediateComponentManager.java:118)
>       at 
> org.apache.felix.scr.impl.manager.DelayedComponentManager.createRealComponent(DelayedComponentManager.java:95)
>       at 
> org.apache.felix.scr.impl.manager.AbstractComponentManager$Registered.getService(AbstractComponentManager.java:1120)
>       at 
> org.apache.felix.scr.impl.manager.DelayedComponentManager.getService(DelayedComponentManager.java:88)
>       at 
> org.apache.felix.framework.ServiceRegistrationImpl.getFactoryUnchecked(ServiceRegistrationImpl.java:307)
>       at 
> org.apache.felix.framework.ServiceRegistrationImpl.getService(ServiceRegistrationImpl.java:221)
>       at 
> org.apache.felix.framework.ServiceRegistry.getService(ServiceRegistry.java:295)
>       at org.apache.felix.framework.Felix.getService(Felix.java:3022)
>       at 
> org.apache.felix.framework.BundleContextImpl.getService(BundleContextImpl.java:329)
>       at 
> org.apache.felix.scr.impl.manager.DependencyManager.getService(DependencyManager.java:785)
>       at 
> org.apache.felix.scr.impl.manager.DependencyManager$1.getInstance(DependencyManager.java:1040)
>       at 
> org.apache.felix.scr.impl.helper.BindMethod.getParameters(BindMethod.java:436)
>       at 
> org.apache.felix.scr.impl.helper.BaseMethod.invokeMethod(BaseMethod.java:213)
>       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:550)
>       at 
> org.apache.felix.scr.impl.helper.BaseMethod.invoke(BaseMethod.java:442)
>       at 
> org.apache.felix.scr.impl.manager.DependencyManager.invokeBindMethod(DependencyManager.java:1028)
>       at 
> org.apache.felix.scr.impl.manager.DependencyManager.bind(DependencyManager.java:932)
>       at 
> org.apache.felix.scr.impl.manager.DependencyManager.open(DependencyManager.java:868)
>       at 
> org.apache.felix.scr.impl.manager.ImmediateComponentManager.createImplementationObject(ImmediateComponentManager.java:200)
>       at 
> org.apache.felix.scr.impl.manager.ImmediateComponentManager.createComponent(ImmediateComponentManager.java:118)
>       at 
> org.apache.felix.scr.impl.manager.DelayedComponentManager.createRealComponent(DelayedComponentManager.java:95)
>       at 
> org.apache.felix.scr.impl.manager.AbstractComponentManager$Registered.getService(AbstractComponentManager.java:1120)
>       at 
> org.apache.felix.scr.impl.manager.DelayedComponentManager.getService(DelayedComponentManager.java:88)
>       at 
> org.apache.felix.framework.ServiceRegistrationImpl.getFactoryUnchecked(ServiceRegistrationImpl.java:307)
>       at 
> org.apache.felix.framework.ServiceRegistrationImpl.getService(ServiceRegistrationImpl.java:221)
>       at 
> org.apache.felix.framework.ServiceRegistry.getService(ServiceRegistry.java:295)
>       at org.apache.felix.framework.Felix.getService(Felix.java:3022)
>       at 
> org.apache.felix.framework.BundleContextImpl.getService(BundleContextImpl.java:329)
>       at 
> org.apache.felix.scr.impl.manager.DependencyManager.getService(DependencyManager.java:785)
>       at 
> org.apache.felix.scr.impl.manager.DependencyManager$1.getInstance(DependencyManager.java:1040)
>       at 
> org.apache.felix.scr.impl.helper.BindMethod.getParameters(BindMethod.java:436)
>       at 
> org.apache.felix.scr.impl.helper.BaseMethod.invokeMethod(BaseMethod.java:213)
>       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:550)
>       at 
> org.apache.felix.scr.impl.helper.BaseMethod$NotResolved.invoke(BaseMethod.java:508)
>       at 
> org.apache.felix.scr.impl.helper.BaseMethod.invoke(BaseMethod.java:442)
>       at 
> org.apache.felix.scr.impl.manager.DependencyManager.invokeBindMethod(DependencyManager.java:1028)
>       at 
> org.apache.felix.scr.impl.manager.DependencyManager.bind(DependencyManager.java:944)
>       at 
> org.apache.felix.scr.impl.manager.DependencyManager.open(DependencyManager.java:868)
>       at 
> org.apache.felix.scr.impl.manager.ImmediateComponentManager.createImplementationObject(ImmediateComponentManager.java:200)
>       at 
> org.apache.felix.scr.impl.manager.ImmediateComponentManager.createComponent(ImmediateComponentManager.java:118)
>       at 
> org.apache.felix.scr.impl.manager.DelayedComponentManager.createRealComponent(DelayedComponentManager.java:95)
>       at 
> org.apache.felix.scr.impl.manager.AbstractComponentManager$Registered.getService(AbstractComponentManager.java:1120)
>       at 
> org.apache.felix.scr.impl.manager.DelayedComponentManager.getService(DelayedComponentManager.java:88)
>       at 
> org.apache.felix.framework.ServiceRegistrationImpl.getFactoryUnchecked(ServiceRegistrationImpl.java:307)
>       at 
> org.apache.felix.framework.ServiceRegistrationImpl.getService(ServiceRegistrationImpl.java:221)
>       at 
> org.apache.felix.framework.ServiceRegistry.getService(ServiceRegistry.java:295)
>       at org.apache.felix.framework.Felix.getService(Felix.java:3022)
>       at 
> org.apache.felix.framework.BundleContextImpl.getService(BundleContextImpl.java:329)
>       at 
> org.apache.felix.scr.impl.manager.DependencyManager.getService(DependencyManager.java:785)
>       at 
> org.apache.felix.scr.impl.manager.DependencyManager$1.getInstance(DependencyManager.java:1040)
>       at 
> org.apache.felix.scr.impl.helper.BindMethod.getParameters(BindMethod.java:436)
>       at 
> org.apache.felix.scr.impl.helper.BaseMethod.invokeMethod(BaseMethod.java:213)
>       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:550)
>       at 
> org.apache.felix.scr.impl.helper.BaseMethod.invoke(BaseMethod.java:442)
>       at 
> org.apache.felix.scr.impl.manager.DependencyManager.invokeBindMethod(DependencyManager.java:1028)
>       at 
> org.apache.felix.scr.impl.manager.DependencyManager.serviceAdded(DependencyManager.java:308)
>       at 
> org.apache.felix.scr.impl.manager.DependencyManager.serviceChanged(DependencyManager.java:170)
>       at 
> org.apache.felix.framework.util.EventDispatcher.invokeServiceListenerCallback(EventDispatcher.java:864)
>       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:3745)
>       at org.apache.felix.framework.Felix.access$000(Felix.java:80)
>       at org.apache.felix.framework.Felix$2.serviceChanged(Felix.java:717)
>       at 
> org.apache.felix.framework.ServiceRegistry.registerService(ServiceRegistry.java:107)
>       at org.apache.felix.framework.Felix.registerService(Felix.java:2862)
>       at 
> org.apache.felix.framework.BundleContextImpl.registerService(BundleContextImpl.java:251)
>       at 
> org.apache.felix.scr.impl.manager.AbstractComponentManager.registerService(AbstractComponentManager.java:425)
>       at 
> org.apache.felix.scr.impl.manager.AbstractComponentManager.registerComponentService(AbstractComponentManager.java:436)
>       at 
> org.apache.felix.scr.impl.manager.AbstractComponentManager$Unsatisfied.activate(AbstractComponentManager.java:984)
>       at 
> org.apache.felix.scr.impl.manager.AbstractComponentManager.activateInternal(AbstractComponentManager.java:309)
>       at 
> org.apache.felix.scr.impl.manager.AbstractComponentManager.enable(AbstractComponentManager.java:133)
>       at 
> org.apache.felix.scr.impl.config.ConfiguredComponentHolder.enableComponents(ConfiguredComponentHolder.java:247)
>       at 
> org.apache.felix.scr.impl.BundleComponentActivator.loadDescriptor(BundleComponentActivator.java:253)
>       at 
> org.apache.felix.scr.impl.BundleComponentActivator.initialize(BundleComponentActivator.java:147)
>       at 
> org.apache.felix.scr.impl.BundleComponentActivator.<init>(BundleComponentActivator.java:111)
>       at 
> org.apache.felix.scr.impl.Activator.loadComponents(Activator.java:255)
>       at org.apache.felix.scr.impl.Activator.bundleChanged(Activator.java:173)
>       at 
> org.apache.felix.framework.util.EventDispatcher.invokeBundleListenerCallback(EventDispatcher.java:800)
>       at 
> org.apache.felix.framework.util.EventDispatcher.fireEventImmediately(EventDispatcher.java:728)
>       at 
> org.apache.felix.framework.util.EventDispatcher.fireBundleEvent(EventDispatcher.java:610)
>       at org.apache.felix.framework.Felix.fireBundleEvent(Felix.java:3734)
>       at org.apache.felix.framework.Felix.startBundle(Felix.java:1807)
>       at org.apache.felix.framework.Felix.updateBundle(Felix.java:2110)
>       at org.apache.felix.framework.BundleImpl.update(BundleImpl.java:923)
>       at org.apache.felix.framework.BundleImpl.update(BundleImpl.java:910)
>       at 
> org.apache.felix.shell.impl.UpdateCommandImpl.execute(UpdateCommandImpl.java:96)
>       at 
> org.apache.felix.shell.impl.Activator$ShellServiceImpl.executeCommand(Activator.java:286)
>       at 
> org.apache.felix.shell.tui.Activator$ShellTuiRunnable.run(Activator.java:184)
>       at java.lang.Thread.run(Thread.java:619)
> ... other logs ...
> 2010-06-25 13:58:48,633 ERROR OsgiLogForwarder - gofer-form: FrameworkEvent 
> ERROR
> org.apache.felix.log.LogException: org.osgi.framework.ServiceException: 
> Service factory returned null.
>       at 
> org.apache.felix.framework.ServiceRegistrationImpl.getFactoryUnchecked(ServiceRegistrationImpl.java:340)
>       at 
> org.apache.felix.framework.ServiceRegistrationImpl.getService(ServiceRegistrationImpl.java:221)
>       at 
> org.apache.felix.framework.ServiceRegistry.getService(ServiceRegistry.java:295)
>       at org.apache.felix.framework.Felix.getService(Felix.java:3022)
>       at 
> org.apache.felix.framework.BundleContextImpl.getService(BundleContextImpl.java:329)
>       at 
> org.apache.felix.scr.impl.manager.DependencyManager.getService(DependencyManager.java:785)
>       at 
> org.apache.felix.scr.impl.manager.DependencyManager$1.getInstance(DependencyManager.java:1040)
>       at 
> org.apache.felix.scr.impl.helper.BindMethod.getParameters(BindMethod.java:436)
>       at 
> org.apache.felix.scr.impl.helper.BaseMethod.invokeMethod(BaseMethod.java:213)
>       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:550)
>       at 
> org.apache.felix.scr.impl.helper.BaseMethod.invoke(BaseMethod.java:442)
>       at 
> org.apache.felix.scr.impl.manager.DependencyManager.invokeBindMethod(DependencyManager.java:1028)
>       at 
> org.apache.felix.scr.impl.manager.DependencyManager.bind(DependencyManager.java:932)
>       at 
> org.apache.felix.scr.impl.manager.DependencyManager.open(DependencyManager.java:868)
>       at 
> org.apache.felix.scr.impl.manager.ImmediateComponentManager.createImplementationObject(ImmediateComponentManager.java:200)
>       at 
> org.apache.felix.scr.impl.manager.ImmediateComponentManager.createComponent(ImmediateComponentManager.java:118)
>       at 
> org.apache.felix.scr.impl.manager.DelayedComponentManager.createRealComponent(DelayedComponentManager.java:95)
>       at 
> org.apache.felix.scr.impl.manager.AbstractComponentManager$Registered.getService(AbstractComponentManager.java:1120)
>       at 
> org.apache.felix.scr.impl.manager.DelayedComponentManager.getService(DelayedComponentManager.java:88)
>       at 
> org.apache.felix.framework.ServiceRegistrationImpl.getFactoryUnchecked(ServiceRegistrationImpl.java:307)
>       at 
> org.apache.felix.framework.ServiceRegistrationImpl.getService(ServiceRegistrationImpl.java:221)
>       at 
> org.apache.felix.framework.ServiceRegistry.getService(ServiceRegistry.java:295)
>       at org.apache.felix.framework.Felix.getService(Felix.java:3022)
>       at 
> org.apache.felix.framework.BundleContextImpl.getService(BundleContextImpl.java:329)
>       at 
> org.apache.felix.scr.impl.manager.DependencyManager.getService(DependencyManager.java:785)
>       at 
> org.apache.felix.scr.impl.manager.DependencyManager$1.getInstance(DependencyManager.java:1040)
>       at 
> org.apache.felix.scr.impl.helper.BindMethod.getParameters(BindMethod.java:436)
>       at 
> org.apache.felix.scr.impl.helper.BaseMethod.invokeMethod(BaseMethod.java:213)
>       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:550)
>       at 
> org.apache.felix.scr.impl.helper.BaseMethod$NotResolved.invoke(BaseMethod.java:508)
>       at 
> org.apache.felix.scr.impl.helper.BaseMethod.invoke(BaseMethod.java:442)
>       at 
> org.apache.felix.scr.impl.manager.DependencyManager.invokeBindMethod(DependencyManager.java:1028)
>       at 
> org.apache.felix.scr.impl.manager.DependencyManager.bind(DependencyManager.java:944)
>       at 
> org.apache.felix.scr.impl.manager.DependencyManager.open(DependencyManager.java:868)
>       at 
> org.apache.felix.scr.impl.manager.ImmediateComponentManager.createImplementationObject(ImmediateComponentManager.java:200)
>       at 
> org.apache.felix.scr.impl.manager.ImmediateComponentManager.createComponent(ImmediateComponentManager.java:118)
>       at 
> org.apache.felix.scr.impl.manager.DelayedComponentManager.createRealComponent(DelayedComponentManager.java:95)
>       at 
> org.apache.felix.scr.impl.manager.AbstractComponentManager$Registered.getService(AbstractComponentManager.java:1120)
>       at 
> org.apache.felix.scr.impl.manager.DelayedComponentManager.getService(DelayedComponentManager.java:88)
>       at 
> org.apache.felix.framework.ServiceRegistrationImpl.getFactoryUnchecked(ServiceRegistrationImpl.java:307)
>       at 
> org.apache.felix.framework.ServiceRegistrationImpl.getService(ServiceRegistrationImpl.java:221)
>       at 
> org.apache.felix.framework.ServiceRegistry.getService(ServiceRegistry.java:295)
>       at org.apache.felix.framework.Felix.getService(Felix.java:3022)
>       at 
> org.apache.felix.framework.BundleContextImpl.getService(BundleContextImpl.java:329)
>       at 
> org.apache.felix.scr.impl.manager.DependencyManager.getService(DependencyManager.java:785)
>       at 
> org.apache.felix.scr.impl.manager.DependencyManager$1.getInstance(DependencyManager.java:1040)
>       at 
> org.apache.felix.scr.impl.helper.BindMethod.getParameters(BindMethod.java:436)
>       at 
> org.apache.felix.scr.impl.helper.BaseMethod.invokeMethod(BaseMethod.java:213)
>       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:550)
>       at 
> org.apache.felix.scr.impl.helper.BaseMethod.invoke(BaseMethod.java:442)
>       at 
> org.apache.felix.scr.impl.manager.DependencyManager.invokeBindMethod(DependencyManager.java:1028)
>       at 
> org.apache.felix.scr.impl.manager.DependencyManager.serviceAdded(DependencyManager.java:308)
>       at 
> org.apache.felix.scr.impl.manager.DependencyManager.serviceChanged(DependencyManager.java:170)
>       at 
> org.apache.felix.framework.util.EventDispatcher.invokeServiceListenerCallback(EventDispatcher.java:864)
>       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:3745)
>       at org.apache.felix.framework.Felix.access$000(Felix.java:80)
>       at org.apache.felix.framework.Felix$2.serviceChanged(Felix.java:717)
>       at 
> org.apache.felix.framework.ServiceRegistry.registerService(ServiceRegistry.java:107)
>       at org.apache.felix.framework.Felix.registerService(Felix.java:2862)
>       at 
> org.apache.felix.framework.BundleContextImpl.registerService(BundleContextImpl.java:251)
>       at 
> org.apache.felix.scr.impl.manager.AbstractComponentManager.registerService(AbstractComponentManager.java:425)
>       at 
> org.apache.felix.scr.impl.manager.AbstractComponentManager.registerComponentService(AbstractComponentManager.java:436)
>       at 
> org.apache.felix.scr.impl.manager.AbstractComponentManager$Unsatisfied.activate(AbstractComponentManager.java:984)
>       at 
> org.apache.felix.scr.impl.manager.AbstractComponentManager.activateInternal(AbstractComponentManager.java:309)
>       at 
> org.apache.felix.scr.impl.manager.AbstractComponentManager.enable(AbstractComponentManager.java:133)
>       at 
> org.apache.felix.scr.impl.config.ConfiguredComponentHolder.enableComponents(ConfiguredComponentHolder.java:247)
>       at 
> org.apache.felix.scr.impl.BundleComponentActivator.loadDescriptor(BundleComponentActivator.java:253)
>       at 
> org.apache.felix.scr.impl.BundleComponentActivator.initialize(BundleComponentActivator.java:147)
>       at 
> org.apache.felix.scr.impl.BundleComponentActivator.<init>(BundleComponentActivator.java:111)
>       at 
> org.apache.felix.scr.impl.Activator.loadComponents(Activator.java:255)
>       at org.apache.felix.scr.impl.Activator.bundleChanged(Activator.java:173)
>       at 
> org.apache.felix.framework.util.EventDispatcher.invokeBundleListenerCallback(EventDispatcher.java:800)
>       at 
> org.apache.felix.framework.util.EventDispatcher.fireEventImmediately(EventDispatcher.java:728)
>       at 
> org.apache.felix.framework.util.EventDispatcher.fireBundleEvent(EventDispatcher.java:610)
>       at org.apache.felix.framework.Felix.fireBundleEvent(Felix.java:3734)
>       at org.apache.felix.framework.Felix.startBundle(Felix.java:1807)
>       at org.apache.felix.framework.Felix.updateBundle(Felix.java:2110)
>       at org.apache.felix.framework.BundleImpl.update(BundleImpl.java:923)
>       at org.apache.felix.framework.BundleImpl.update(BundleImpl.java:910)
>       at 
> org.apache.felix.shell.impl.UpdateCommandImpl.execute(UpdateCommandImpl.java:96)
>       at 
> org.apache.felix.shell.impl.Activator$ShellServiceImpl.executeCommand(Activator.java:286)
>       at 
> org.apache.felix.shell.tui.Activator$ShellTuiRunnable.run(Activator.java:184)
>       at java.lang.Thread.run(Thread.java:619)
> Sure, there is a cycle but this cycle can be resolved as one of the 
> cardinalities is 0..n. If I manually scr disable the component "Item" and 
> enable it again, then all is OK. Also, if XML definition of the "Item" 
> component is being read later than that of component "ItemRegister", then 
> bundle reloading runs OK. But not on the framework startup. 

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