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From "Felix Meschberger (JIRA)" <j...@apache.org>
Subject [jira] Created: (FELIX-2520) Bind method selection must not expect the component's bundle to import the service interface type
Date Thu, 05 Aug 2010 08:42:15 GMT
Bind method selection must not expect the component's bundle to import the service interface
type
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                 Key: FELIX-2520
                 URL: https://issues.apache.org/jira/browse/FELIX-2520
             Project: Felix
          Issue Type: Bug
          Components: Declarative Services (SCR), Specification compliance
    Affects Versions:  scr-1.4.0
            Reporter: Felix Meschberger
            Assignee: Felix Meschberger
             Fix For:  scr-1.4.2


Our Declarative Services implementation tries to load the type of the bound service through
the class loader of the component. This has the side-effect of expecting the component's bundle
to actually import (and wire to) the package providing the interface.

On the other hand the Declarative Services specification states, that a bind/unbind method
is acceptable if "the type of the argument is assignable from the type specified by the reference's
interface attribute" (OSGi Compendium R4.2, Section 112.3.1, Accessing Services). This does
not imply that the component must know the service type but a supertype of the service type.

For example the CT contains a test where the component's bind method expects an Object type
parameter (which is certainly assignable from any type) but the component's bundle does not
import the actual interface type. Thus with the current implementation the CT test fails.

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