[jira] [Created] (FELIX-5957) Check if a default implementation is used only on optional dependencies

[Pierre De Rop (JIRA)]

Pierre De Rop created FELIX-5957:
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             Summary: Check if a default implementation is used only on 
optional dependencies
                 Key: FELIX-5957
                 URL: https://issues.apache.org/jira/browse/FELIX-5957
             Project: Felix
          Issue Type: Improvement
          Components: Dependency Manager Annotations
    Affects Versions: org.apache.felix.dependencymanager-r1
            Reporter: Pierre De Rop
            Assignee: Pierre De Rop
             Fix For: org.apache.felix.dependencymanager-r12


When an optional dependency is defined on a class field, then a NullObject is 
injected in case the dependency is unavailable.

Now, it is possible to also set a default implementation using the 
ServiceDependency.defaultImpl attribute. This attribute refers to class that 
will be used when the service dependency is unavailable.

For example:
{code:java}
@Component
class MyComponent {
    @ServiceDependency(required=false, defaultImpl=MyDefaultImpl.class) 
    Dependency m_èdependency;
}
{code}

But it is an error to use the defaultImpl attribute when the dependency is 
required or when the dependency is not applied on a class field. So, the DM 
annocation scanner should report an error in such a case.




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