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Posted to dev@felix.apache.org by "Rajini Sivaram (JIRA)" <ji...@apache.org> on 2007/08/21 10:33:30 UTC
[jira] Created: (FELIX-341) Intermittent exception during Felix
shutdown
Intermittent exception during Felix shutdown
--------------------------------------------
Key: FELIX-341
URL: https://issues.apache.org/jira/browse/FELIX-341
Project: Felix
Issue Type: Bug
Components: Declarative Services
Affects Versions: 1.0.0
Reporter: Rajini Sivaram
One of my testcases intermittently throws an exception during shutdown. I have managed to recreate the exception under a debugger, and it shows two threads trying to unregister the same service. The test fails only when declarative services are used. I am using Felix 1.0.0 framework and the latest snapshot of SCR. The test uses multiple versions of a bundle, but I am not sure if that has anything to do with the exception.
The exception thrown is:
--- Exception with component : Unexpected problem executing task ---
java.lang.IllegalStateException: Service already unregistered.
at org.apache.felix.framework.ServiceRegistrationImpl.unregister (ServiceRegistrationImpl.java:105)
at org.apache.felix.scr.AbstractComponentManager.unregisterComponentService(AbstractComponentManager.java:503)
at org.apache.felix.scr.AbstractComponentManager.deactivateInternal (AbstractComponentManager.java:369)
at org.apache.felix.scr.AbstractComponentManager.access$200(AbstractComponentManager.java:55)
at org.apache.felix.scr.AbstractComponentManager$3.run(AbstractComponentManager.java :176)
at org.apache.felix.scr.ComponentActorThread.run(ComponentActorThread.java:81)
Here is the stack trace of the two threads under the debugger (both are using the same object):
Thread [FelixStartLevel] (Suspended (breakpoint at line 97 in ServiceRegistrationImpl))
ServiceRegistrationImpl.unregister() line: 97
ServiceRegistry.unregisterServices (Bundle) line: 119
Felix._stopBundle(FelixBundle, boolean) line: 1946
Felix.stopBundle(FelixBundle, boolean) line: 1866
Felix.setFrameworkStartLevel (int) line: 1080
StartLevelImpl.run() line: 258
Thread.run() line: 803
Thread [SCR Component Actor] (Suspended (breakpoint at line 97 in ServiceRegistrationImpl))
ServiceRegistrationImpl.unregister() line: 97
ImmediateComponentManager(AbstractComponentManager).unregisterComponentService() line: 503
ImmediateComponentManager(AbstractComponentManager).deactivateInternal() line: 369
AbstractComponentManager.access$200(AbstractComponentManager) line: 55
AbstractComponentManager$3.run() line: 176
ComponentActorThread.run() line: 81
The exception thrown is the IllegalStateException from
public void unregister()
{
if (m_svcObj != null)
{
m_registry.unregisterService(m_bundle, this);
m_svcObj = null;
m_factory = null;
}
else
{
throw new IllegalStateException("Service already unregistered.");
}
}
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[jira] Work started: (FELIX-341) Intermittent exception during
Felix shutdown
Posted by "Felix Meschberger (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/FELIX-341?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Work on FELIX-341 started by Felix Meschberger.
> Intermittent exception during Felix shutdown
> --------------------------------------------
>
> Key: FELIX-341
> URL: https://issues.apache.org/jira/browse/FELIX-341
> Project: Felix
> Issue Type: Bug
> Components: Declarative Services
> Affects Versions: 1.0.0
> Reporter: Rajini Sivaram
> Assignee: Felix Meschberger
>
> One of my testcases intermittently throws an exception during shutdown. I have managed to recreate the exception under a debugger, and it shows two threads trying to unregister the same service. The test fails only when declarative services are used. I am using Felix 1.0.0 framework and the latest snapshot of SCR. The test uses multiple versions of a bundle, but I am not sure if that has anything to do with the exception.
>
> The exception thrown is:
>
> --- Exception with component : Unexpected problem executing task ---
> java.lang.IllegalStateException: Service already unregistered.
> at org.apache.felix.framework.ServiceRegistrationImpl.unregister (ServiceRegistrationImpl.java:105)
> at org.apache.felix.scr.AbstractComponentManager.unregisterComponentService(AbstractComponentManager.java:503)
> at org.apache.felix.scr.AbstractComponentManager.deactivateInternal (AbstractComponentManager.java:369)
> at org.apache.felix.scr.AbstractComponentManager.access$200(AbstractComponentManager.java:55)
> at org.apache.felix.scr.AbstractComponentManager$3.run(AbstractComponentManager.java :176)
> at org.apache.felix.scr.ComponentActorThread.run(ComponentActorThread.java:81)
>
> Here is the stack trace of the two threads under the debugger (both are using the same object):
>
> Thread [FelixStartLevel] (Suspended (breakpoint at line 97 in ServiceRegistrationImpl))
> ServiceRegistrationImpl.unregister() line: 97
> ServiceRegistry.unregisterServices (Bundle) line: 119
> Felix._stopBundle(FelixBundle, boolean) line: 1946
> Felix.stopBundle(FelixBundle, boolean) line: 1866
> Felix.setFrameworkStartLevel (int) line: 1080
> StartLevelImpl.run() line: 258
> Thread.run() line: 803
> Thread [SCR Component Actor] (Suspended (breakpoint at line 97 in ServiceRegistrationImpl))
> ServiceRegistrationImpl.unregister() line: 97
> ImmediateComponentManager(AbstractComponentManager).unregisterComponentService() line: 503
> ImmediateComponentManager(AbstractComponentManager).deactivateInternal() line: 369
> AbstractComponentManager.access$200(AbstractComponentManager) line: 55
> AbstractComponentManager$3.run() line: 176
> ComponentActorThread.run() line: 81
>
>
> The exception thrown is the IllegalStateException from
> public void unregister()
> {
> if (m_svcObj != null)
> {
> m_registry.unregisterService(m_bundle, this);
> m_svcObj = null;
> m_factory = null;
> }
> else
> {
> throw new IllegalStateException("Service already unregistered.");
> }
> }
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[jira] Commented: (FELIX-341) Intermittent exception during Felix
shutdown
Posted by "Felix Meschberger (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/FELIX-341?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12523829 ]
Felix Meschberger commented on FELIX-341:
-----------------------------------------
Rajini provided me with additional testcase instructions, which showed the following behaviour:
Consider Bundle B1 with Component C1 registered as a service and Bundle B2 with Component C2 registered as a service. C1 has a mandatory dependency on C2 and B1 is started before B2.
When the framework is shut down, B2 is stopped before B1. While stopping B2, Component C2 is unregistered as a service and deactivated. As a result C1 is to be deactivated and hence unregistered as a service. This deactivation of C1 is launched asynchronously such that B1 will not deactivate C1 as it already is assumed to be deactivated.
Due to timing issues the asynchronous deactivation of C1 may be delayed such that service registration of C1 is unregistered by the framework due to Bundle B1 stop before C1 deactivation could unregister the service. This could cause trying to unregister the same service twice and hence the IllegalStateException.
Though this seems to be a multithreading corner case, there is another catch with asynchronously deactivating components due to unregistered services: If a component has a dependency on another service, it should be notified of the removal of the service as fast as possible. Hence, this situation should be handled synchronously to the service unregistration notice. So the fix is to immediately deactivate the depending component and schedule the reactivation asynchronously.
At the same time I add more logging and more security to not activate components while the owning bundle is actually shutting down.
> Intermittent exception during Felix shutdown
> --------------------------------------------
>
> Key: FELIX-341
> URL: https://issues.apache.org/jira/browse/FELIX-341
> Project: Felix
> Issue Type: Bug
> Components: Declarative Services
> Affects Versions: 1.0.0
> Reporter: Rajini Sivaram
> Assignee: Felix Meschberger
>
> One of my testcases intermittently throws an exception during shutdown. I have managed to recreate the exception under a debugger, and it shows two threads trying to unregister the same service. The test fails only when declarative services are used. I am using Felix 1.0.0 framework and the latest snapshot of SCR. The test uses multiple versions of a bundle, but I am not sure if that has anything to do with the exception.
>
> The exception thrown is:
>
> --- Exception with component : Unexpected problem executing task ---
> java.lang.IllegalStateException: Service already unregistered.
> at org.apache.felix.framework.ServiceRegistrationImpl.unregister (ServiceRegistrationImpl.java:105)
> at org.apache.felix.scr.AbstractComponentManager.unregisterComponentService(AbstractComponentManager.java:503)
> at org.apache.felix.scr.AbstractComponentManager.deactivateInternal (AbstractComponentManager.java:369)
> at org.apache.felix.scr.AbstractComponentManager.access$200(AbstractComponentManager.java:55)
> at org.apache.felix.scr.AbstractComponentManager$3.run(AbstractComponentManager.java :176)
> at org.apache.felix.scr.ComponentActorThread.run(ComponentActorThread.java:81)
>
> Here is the stack trace of the two threads under the debugger (both are using the same object):
>
> Thread [FelixStartLevel] (Suspended (breakpoint at line 97 in ServiceRegistrationImpl))
> ServiceRegistrationImpl.unregister() line: 97
> ServiceRegistry.unregisterServices (Bundle) line: 119
> Felix._stopBundle(FelixBundle, boolean) line: 1946
> Felix.stopBundle(FelixBundle, boolean) line: 1866
> Felix.setFrameworkStartLevel (int) line: 1080
> StartLevelImpl.run() line: 258
> Thread.run() line: 803
> Thread [SCR Component Actor] (Suspended (breakpoint at line 97 in ServiceRegistrationImpl))
> ServiceRegistrationImpl.unregister() line: 97
> ImmediateComponentManager(AbstractComponentManager).unregisterComponentService() line: 503
> ImmediateComponentManager(AbstractComponentManager).deactivateInternal() line: 369
> AbstractComponentManager.access$200(AbstractComponentManager) line: 55
> AbstractComponentManager$3.run() line: 176
> ComponentActorThread.run() line: 81
>
>
> The exception thrown is the IllegalStateException from
> public void unregister()
> {
> if (m_svcObj != null)
> {
> m_registry.unregisterService(m_bundle, this);
> m_svcObj = null;
> m_factory = null;
> }
> else
> {
> throw new IllegalStateException("Service already unregistered.");
> }
> }
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[jira] Commented: (FELIX-341) Intermittent exception during Felix
shutdown
Posted by "Felix Meschberger (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/FELIX-341?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12521828 ]
Felix Meschberger commented on FELIX-341:
-----------------------------------------
I cannot exactly tell, what is going on here. Telling from the code, the deactivate() method, which asynchronously calls the deactivateInternal() method, is only called from the createImplementationObject method to "deactivate" the component if activation fails. It is of course not a good thing, that this method calls component deactivation asynchronously. Instead the component should be marked inactive immediately (aka synchronously).
On the other hand, the createImplementationObject method should not actually call deactivate, as all that needs to be undone is
> object creation: nothing to do, we just ignore the reference to the newly created object
> reference binding: we need to unbind any bound references
> activate method: nothing to do (if object creation fails before, activate is not called, otherwise activate failed)
So, the fix is to just make sure, any bound references are unbound and that - in the case of an immediate component - the state is not set to active and - if so configured - no services are registered.
Fixed like this in Rev. 568657
> Intermittent exception during Felix shutdown
> --------------------------------------------
>
> Key: FELIX-341
> URL: https://issues.apache.org/jira/browse/FELIX-341
> Project: Felix
> Issue Type: Bug
> Components: Declarative Services
> Affects Versions: 1.0.0
> Reporter: Rajini Sivaram
> Assignee: Felix Meschberger
>
> One of my testcases intermittently throws an exception during shutdown. I have managed to recreate the exception under a debugger, and it shows two threads trying to unregister the same service. The test fails only when declarative services are used. I am using Felix 1.0.0 framework and the latest snapshot of SCR. The test uses multiple versions of a bundle, but I am not sure if that has anything to do with the exception.
>
> The exception thrown is:
>
> --- Exception with component : Unexpected problem executing task ---
> java.lang.IllegalStateException: Service already unregistered.
> at org.apache.felix.framework.ServiceRegistrationImpl.unregister (ServiceRegistrationImpl.java:105)
> at org.apache.felix.scr.AbstractComponentManager.unregisterComponentService(AbstractComponentManager.java:503)
> at org.apache.felix.scr.AbstractComponentManager.deactivateInternal (AbstractComponentManager.java:369)
> at org.apache.felix.scr.AbstractComponentManager.access$200(AbstractComponentManager.java:55)
> at org.apache.felix.scr.AbstractComponentManager$3.run(AbstractComponentManager.java :176)
> at org.apache.felix.scr.ComponentActorThread.run(ComponentActorThread.java:81)
>
> Here is the stack trace of the two threads under the debugger (both are using the same object):
>
> Thread [FelixStartLevel] (Suspended (breakpoint at line 97 in ServiceRegistrationImpl))
> ServiceRegistrationImpl.unregister() line: 97
> ServiceRegistry.unregisterServices (Bundle) line: 119
> Felix._stopBundle(FelixBundle, boolean) line: 1946
> Felix.stopBundle(FelixBundle, boolean) line: 1866
> Felix.setFrameworkStartLevel (int) line: 1080
> StartLevelImpl.run() line: 258
> Thread.run() line: 803
> Thread [SCR Component Actor] (Suspended (breakpoint at line 97 in ServiceRegistrationImpl))
> ServiceRegistrationImpl.unregister() line: 97
> ImmediateComponentManager(AbstractComponentManager).unregisterComponentService() line: 503
> ImmediateComponentManager(AbstractComponentManager).deactivateInternal() line: 369
> AbstractComponentManager.access$200(AbstractComponentManager) line: 55
> AbstractComponentManager$3.run() line: 176
> ComponentActorThread.run() line: 81
>
>
> The exception thrown is the IllegalStateException from
> public void unregister()
> {
> if (m_svcObj != null)
> {
> m_registry.unregisterService(m_bundle, this);
> m_svcObj = null;
> m_factory = null;
> }
> else
> {
> throw new IllegalStateException("Service already unregistered.");
> }
> }
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[jira] Closed: (FELIX-341) Intermittent exception during Felix
shutdown
Posted by "Felix Meschberger (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/FELIX-341?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Felix Meschberger closed FELIX-341.
-----------------------------------
This has been confirmed to be fixed
> Intermittent exception during Felix shutdown
> --------------------------------------------
>
> Key: FELIX-341
> URL: https://issues.apache.org/jira/browse/FELIX-341
> Project: Felix
> Issue Type: Bug
> Components: Declarative Services
> Affects Versions: 1.0.0
> Reporter: Rajini Sivaram
> Assignee: Felix Meschberger
> Fix For: 1.0.0
>
>
> One of my testcases intermittently throws an exception during shutdown. I have managed to recreate the exception under a debugger, and it shows two threads trying to unregister the same service. The test fails only when declarative services are used. I am using Felix 1.0.0 framework and the latest snapshot of SCR. The test uses multiple versions of a bundle, but I am not sure if that has anything to do with the exception.
>
> The exception thrown is:
>
> --- Exception with component : Unexpected problem executing task ---
> java.lang.IllegalStateException: Service already unregistered.
> at org.apache.felix.framework.ServiceRegistrationImpl.unregister (ServiceRegistrationImpl.java:105)
> at org.apache.felix.scr.AbstractComponentManager.unregisterComponentService(AbstractComponentManager.java:503)
> at org.apache.felix.scr.AbstractComponentManager.deactivateInternal (AbstractComponentManager.java:369)
> at org.apache.felix.scr.AbstractComponentManager.access$200(AbstractComponentManager.java:55)
> at org.apache.felix.scr.AbstractComponentManager$3.run(AbstractComponentManager.java :176)
> at org.apache.felix.scr.ComponentActorThread.run(ComponentActorThread.java:81)
>
> Here is the stack trace of the two threads under the debugger (both are using the same object):
>
> Thread [FelixStartLevel] (Suspended (breakpoint at line 97 in ServiceRegistrationImpl))
> ServiceRegistrationImpl.unregister() line: 97
> ServiceRegistry.unregisterServices (Bundle) line: 119
> Felix._stopBundle(FelixBundle, boolean) line: 1946
> Felix.stopBundle(FelixBundle, boolean) line: 1866
> Felix.setFrameworkStartLevel (int) line: 1080
> StartLevelImpl.run() line: 258
> Thread.run() line: 803
> Thread [SCR Component Actor] (Suspended (breakpoint at line 97 in ServiceRegistrationImpl))
> ServiceRegistrationImpl.unregister() line: 97
> ImmediateComponentManager(AbstractComponentManager).unregisterComponentService() line: 503
> ImmediateComponentManager(AbstractComponentManager).deactivateInternal() line: 369
> AbstractComponentManager.access$200(AbstractComponentManager) line: 55
> AbstractComponentManager$3.run() line: 176
> ComponentActorThread.run() line: 81
>
>
> The exception thrown is the IllegalStateException from
> public void unregister()
> {
> if (m_svcObj != null)
> {
> m_registry.unregisterService(m_bundle, this);
> m_svcObj = null;
> m_factory = null;
> }
> else
> {
> throw new IllegalStateException("Service already unregistered.");
> }
> }
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[jira] Assigned: (FELIX-341) Intermittent exception during Felix
shutdown
Posted by "Felix Meschberger (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/FELIX-341?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Felix Meschberger reassigned FELIX-341:
---------------------------------------
Assignee: Felix Meschberger
> Intermittent exception during Felix shutdown
> --------------------------------------------
>
> Key: FELIX-341
> URL: https://issues.apache.org/jira/browse/FELIX-341
> Project: Felix
> Issue Type: Bug
> Components: Declarative Services
> Affects Versions: 1.0.0
> Reporter: Rajini Sivaram
> Assignee: Felix Meschberger
>
> One of my testcases intermittently throws an exception during shutdown. I have managed to recreate the exception under a debugger, and it shows two threads trying to unregister the same service. The test fails only when declarative services are used. I am using Felix 1.0.0 framework and the latest snapshot of SCR. The test uses multiple versions of a bundle, but I am not sure if that has anything to do with the exception.
>
> The exception thrown is:
>
> --- Exception with component : Unexpected problem executing task ---
> java.lang.IllegalStateException: Service already unregistered.
> at org.apache.felix.framework.ServiceRegistrationImpl.unregister (ServiceRegistrationImpl.java:105)
> at org.apache.felix.scr.AbstractComponentManager.unregisterComponentService(AbstractComponentManager.java:503)
> at org.apache.felix.scr.AbstractComponentManager.deactivateInternal (AbstractComponentManager.java:369)
> at org.apache.felix.scr.AbstractComponentManager.access$200(AbstractComponentManager.java:55)
> at org.apache.felix.scr.AbstractComponentManager$3.run(AbstractComponentManager.java :176)
> at org.apache.felix.scr.ComponentActorThread.run(ComponentActorThread.java:81)
>
> Here is the stack trace of the two threads under the debugger (both are using the same object):
>
> Thread [FelixStartLevel] (Suspended (breakpoint at line 97 in ServiceRegistrationImpl))
> ServiceRegistrationImpl.unregister() line: 97
> ServiceRegistry.unregisterServices (Bundle) line: 119
> Felix._stopBundle(FelixBundle, boolean) line: 1946
> Felix.stopBundle(FelixBundle, boolean) line: 1866
> Felix.setFrameworkStartLevel (int) line: 1080
> StartLevelImpl.run() line: 258
> Thread.run() line: 803
> Thread [SCR Component Actor] (Suspended (breakpoint at line 97 in ServiceRegistrationImpl))
> ServiceRegistrationImpl.unregister() line: 97
> ImmediateComponentManager(AbstractComponentManager).unregisterComponentService() line: 503
> ImmediateComponentManager(AbstractComponentManager).deactivateInternal() line: 369
> AbstractComponentManager.access$200(AbstractComponentManager) line: 55
> AbstractComponentManager$3.run() line: 176
> ComponentActorThread.run() line: 81
>
>
> The exception thrown is the IllegalStateException from
> public void unregister()
> {
> if (m_svcObj != null)
> {
> m_registry.unregisterService(m_bundle, this);
> m_svcObj = null;
> m_factory = null;
> }
> else
> {
> throw new IllegalStateException("Service already unregistered.");
> }
> }
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[jira] Resolved: (FELIX-341) Intermittent exception during Felix
shutdown
Posted by "Felix Meschberger (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/FELIX-341?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Felix Meschberger resolved FELIX-341.
-------------------------------------
Resolution: Fixed
Fix Version/s: 1.0.0
Fixed in Rev. 571194 as follows:
* Enhanced logging
* No activation of components when the owning bundle is (being) stopped
* Synchronous Component Deactivation (Activation still asynchronous)
* No more Task Scheduling while a Bundle is stopped or stopping
Also deployed a new snapshot.
> Intermittent exception during Felix shutdown
> --------------------------------------------
>
> Key: FELIX-341
> URL: https://issues.apache.org/jira/browse/FELIX-341
> Project: Felix
> Issue Type: Bug
> Components: Declarative Services
> Affects Versions: 1.0.0
> Reporter: Rajini Sivaram
> Assignee: Felix Meschberger
> Fix For: 1.0.0
>
>
> One of my testcases intermittently throws an exception during shutdown. I have managed to recreate the exception under a debugger, and it shows two threads trying to unregister the same service. The test fails only when declarative services are used. I am using Felix 1.0.0 framework and the latest snapshot of SCR. The test uses multiple versions of a bundle, but I am not sure if that has anything to do with the exception.
>
> The exception thrown is:
>
> --- Exception with component : Unexpected problem executing task ---
> java.lang.IllegalStateException: Service already unregistered.
> at org.apache.felix.framework.ServiceRegistrationImpl.unregister (ServiceRegistrationImpl.java:105)
> at org.apache.felix.scr.AbstractComponentManager.unregisterComponentService(AbstractComponentManager.java:503)
> at org.apache.felix.scr.AbstractComponentManager.deactivateInternal (AbstractComponentManager.java:369)
> at org.apache.felix.scr.AbstractComponentManager.access$200(AbstractComponentManager.java:55)
> at org.apache.felix.scr.AbstractComponentManager$3.run(AbstractComponentManager.java :176)
> at org.apache.felix.scr.ComponentActorThread.run(ComponentActorThread.java:81)
>
> Here is the stack trace of the two threads under the debugger (both are using the same object):
>
> Thread [FelixStartLevel] (Suspended (breakpoint at line 97 in ServiceRegistrationImpl))
> ServiceRegistrationImpl.unregister() line: 97
> ServiceRegistry.unregisterServices (Bundle) line: 119
> Felix._stopBundle(FelixBundle, boolean) line: 1946
> Felix.stopBundle(FelixBundle, boolean) line: 1866
> Felix.setFrameworkStartLevel (int) line: 1080
> StartLevelImpl.run() line: 258
> Thread.run() line: 803
> Thread [SCR Component Actor] (Suspended (breakpoint at line 97 in ServiceRegistrationImpl))
> ServiceRegistrationImpl.unregister() line: 97
> ImmediateComponentManager(AbstractComponentManager).unregisterComponentService() line: 503
> ImmediateComponentManager(AbstractComponentManager).deactivateInternal() line: 369
> AbstractComponentManager.access$200(AbstractComponentManager) line: 55
> AbstractComponentManager$3.run() line: 176
> ComponentActorThread.run() line: 81
>
>
> The exception thrown is the IllegalStateException from
> public void unregister()
> {
> if (m_svcObj != null)
> {
> m_registry.unregisterService(m_bundle, this);
> m_svcObj = null;
> m_factory = null;
> }
> else
> {
> throw new IllegalStateException("Service already unregistered.");
> }
> }
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[jira] Updated: (FELIX-341) Intermittent exception during Felix
shutdown
Posted by "Felix Meschberger (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/FELIX-341?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Felix Meschberger updated FELIX-341:
------------------------------------
Fix Version/s: (was: felix-1.0.0)
scr-1.0.0
> Intermittent exception during Felix shutdown
> --------------------------------------------
>
> Key: FELIX-341
> URL: https://issues.apache.org/jira/browse/FELIX-341
> Project: Felix
> Issue Type: Bug
> Components: Declarative Services (SCR)
> Affects Versions: felix-1.0.0
> Reporter: Rajini Sivaram
> Assignee: Felix Meschberger
> Fix For: scr-1.0.0
>
>
> One of my testcases intermittently throws an exception during shutdown. I have managed to recreate the exception under a debugger, and it shows two threads trying to unregister the same service. The test fails only when declarative services are used. I am using Felix 1.0.0 framework and the latest snapshot of SCR. The test uses multiple versions of a bundle, but I am not sure if that has anything to do with the exception.
>
> The exception thrown is:
>
> --- Exception with component : Unexpected problem executing task ---
> java.lang.IllegalStateException: Service already unregistered.
> at org.apache.felix.framework.ServiceRegistrationImpl.unregister (ServiceRegistrationImpl.java:105)
> at org.apache.felix.scr.AbstractComponentManager.unregisterComponentService(AbstractComponentManager.java:503)
> at org.apache.felix.scr.AbstractComponentManager.deactivateInternal (AbstractComponentManager.java:369)
> at org.apache.felix.scr.AbstractComponentManager.access$200(AbstractComponentManager.java:55)
> at org.apache.felix.scr.AbstractComponentManager$3.run(AbstractComponentManager.java :176)
> at org.apache.felix.scr.ComponentActorThread.run(ComponentActorThread.java:81)
>
> Here is the stack trace of the two threads under the debugger (both are using the same object):
>
> Thread [FelixStartLevel] (Suspended (breakpoint at line 97 in ServiceRegistrationImpl))
> ServiceRegistrationImpl.unregister() line: 97
> ServiceRegistry.unregisterServices (Bundle) line: 119
> Felix._stopBundle(FelixBundle, boolean) line: 1946
> Felix.stopBundle(FelixBundle, boolean) line: 1866
> Felix.setFrameworkStartLevel (int) line: 1080
> StartLevelImpl.run() line: 258
> Thread.run() line: 803
> Thread [SCR Component Actor] (Suspended (breakpoint at line 97 in ServiceRegistrationImpl))
> ServiceRegistrationImpl.unregister() line: 97
> ImmediateComponentManager(AbstractComponentManager).unregisterComponentService() line: 503
> ImmediateComponentManager(AbstractComponentManager).deactivateInternal() line: 369
> AbstractComponentManager.access$200(AbstractComponentManager) line: 55
> AbstractComponentManager$3.run() line: 176
> ComponentActorThread.run() line: 81
>
>
> The exception thrown is the IllegalStateException from
> public void unregister()
> {
> if (m_svcObj != null)
> {
> m_registry.unregisterService(m_bundle, this);
> m_svcObj = null;
> m_factory = null;
> }
> else
> {
> throw new IllegalStateException("Service already unregistered.");
> }
> }
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