Felix Meschberger created FELIX-3723:
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Summary: ClassCastException on ConfigurationAdmin service creating
components
Key: FELIX-3723
URL: https://issues.apache.org/jira/browse/FELIX-3723
Project: Felix
Issue Type: Bug
Components: Declarative Services (SCR)
Affects Versions: scr-1.6.0
Reporter: Felix Meschberger
Fix For: scr-1.6.2
Consider this situation:
* Felix SCR 1.6
Import-Package:
org.osgi.service.cm;version=[1.2,2.0);resolution:=optional
* OSGi Enterprise R5 API bundle
Export-Package: org.osgi.service.cm;version=1.5
* Felix Configuration Admin 1.4.0
Export-Package: org.osgi.service.cm;version=1.4
Import-Package: org.osgi.service.cm;version=[1.4,1.5)
* Component Bundle
Import-Package: org.osgi.service.cm;version=[1.4,1.5)
A component from the "Component Bundle" is registered and SCR happily starts
creating it. SCR uses the Component Bundle's context to get the Configuration
Admin serivce. Since the Component Bundle is wired tothe Felix Configuration
Admin bundle it has an appropriate service implementation and the reference can
be returned.
SCR then uses the Component Bundle's BundleContext to get the service. This
succeeds.
Now SCR tries to cast the service Object to a ConfigurationAdmin object. But
since the SCR bundle itself is wired to another API (the Enterprise one), the
ConfugurationAdmin interface class objects are not the same and the cast fails.
Consequently, since this is not expected (but should be in this case),
component creation fails.
The returned service should be checked, whether it can be cast to prevent this
kind of failure.
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