Hi Everyone
I was wondering if anyone could provide some advice:
I have a component of the form:
@Component(name="Bar")
public class MyComponent {
private MyServiceProcessor processor;
@Activate
public void activate(ComponentContext cc) {
processor = new MyServiceProcessor();
}
@Deactivate
public void deactivate(ComponentContext cc) {
}
@Reference(cardinality = ReferenceCardinality.MULTIPLE)
public void bindFoo(ServiceReference<Foo> ref) {
/* some code here */
processor.process(ref.getService());
/* some more code here */
}
public void unbindFoo(ServiceReference<Foo> ref) {
}
}
The problem here is that the bindFoo() method is called by the SCR before the
activate and thus a null pointer exception is thrown in the processor.process()
call.
This is perhaps not surprising, but it is not ideal for a component that is
‘lazy’ about the other services that it wants to discover. I could clearly move
this functionality into a ServiceTracker which I create in the activate() but
was wondering if there was another approach that allowed me to do this via DS
and annotations?
Best regards
Bruce
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