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https://issues.apache.org/jira/browse/FELIX-2372?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12873564#action_12873564
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Felix Meschberger commented on FELIX-2372:
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Such cycles should actually be detected by SCR (Declarative Services
Specification Section 112.3.5, Circular References), but this is not currently
implemented, see FELIX-1824.
> Improve logging on IllegalStateException getting a service
> ----------------------------------------------------------
>
> Key: FELIX-2372
> URL: https://issues.apache.org/jira/browse/FELIX-2372
> Project: Felix
> Issue Type: Improvement
> Components: Declarative Services (SCR)
> Affects Versions: scr-1.4.0
> Reporter: Felix Meschberger
> Assignee: Felix Meschberger
> Fix For: scr-1.4.2
>
>
> BundleContext.getService() may throw an IllegalStateException if the bundle
> context is invalid. In addition the Felix implementation may also throw this
> exception of the service to be trieved is a ServiceFactory whose real service
> cannot be retrieved due to a cycle in service dependencies.
> The DependencyManager should log this exception clearly to help solve the
> actual problem.
> In the current Felix Declarative Service implementation such a loop can be
> created if there is a depedency loop amongst delayed service components, like
> this:
> Delayed Component A, provides Service A, requires Service C
> Delayed Component B, provides Service B, requires Service A
> Delayed Component C, provides Service C, requires Service B
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