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From "David Humeniuk (JIRA)" <j...@apache.org>
Subject [jira] [Created] (FELIX-2923) Get a ServiceFactory.getService() resulted in a cycle message when registering a service inside a DS activation method
Date Tue, 19 Apr 2011 16:10:08 GMT
Get a ServiceFactory.getService()  resulted in a cycle message when registering a service inside
a DS activation method
-----------------------------------------------------------------------------------------------------------------------

                 Key: FELIX-2923
                 URL: https://issues.apache.org/jira/browse/FELIX-2923
             Project: Felix
          Issue Type: Bug
          Components: Declarative Services (SCR)
    Affects Versions:  scr-1.6.0
            Reporter: David Humeniuk


I've run into an issue with Felix SCR where I get the message:

ServiceFactory.getService() resulted in a cycle

The reason this appers to be occuring is because within an activation method of a service
component, call it ServiceAImpl (which provides ServiceA), the component registers another
service, call it ServiceB.

I have another service component, call it ServiceCImpl, which depends on both ServiceA and
ServiceB. When ServiceAImpl registers ServiceB, ServiceCImpl is attemted to be activated within
the call to activate ServiceAImpl.  As part of the activation, the ServiceCImpl binding methods
are called (at least attempted). When the binding method for ServiceA is attempted, the cycle
is detected and the component fails to initialize.

I guess what doesn't make sense is why the SCR will activate ServiceCImpl within the activation
method of ServiceAImpl. I wouldn't think that ServiceCImpl would be considered satisfied until
after the activation method has exited. Perhaps this is an issue of using declarative services
while still registering services directly with the framework?



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