Serge Huber created FELIX-4296:
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Summary: Cannot deactivate service interface detection in DS
annotations
Key: FELIX-4296
URL: https://issues.apache.org/jira/browse/FELIX-4296
Project: Felix
Issue Type: Bug
Components: SCR Annotations
Affects Versions: scr ds annotations 1.2.4
Reporter: Serge Huber
I am trying to use DS annotations to declare an extender, and I have the
following annotation and class definition :
@Component(service={})
public class ExtenderBundleListener implements SynchronousBundleListener {
According to the DS annotation specification this is value, as is illustrated
from the javadoc :
/**
* The types under which to register this Component as a service.
*
* <p>
* If no service should be registered, the empty value
* <code>{}</code> must be specified.
*
* <p>
* If not specified, the service types for this Component are all the
* <i>directly</i> implemented interfaces of the class being annotated.
*
* @see "The service element of a Component Description."
*/
Class< ? >[] service() default {};
Unfortunately this doesn't work, as it seems that the annotation parser
transforms the {} value into "null" so the following code in the DS annotation
processor doesn't work as expected :
final List<String> listedInterfaces = new ArrayList<String>();
if (cad.getValue("service") != null) {
final String[] interfaces = (String[]) cad.getValue("service");
for (final String t : interfaces) {
listedInterfaces.add(t);
}
} else {
// scan directly implemented interfaces
this.searchInterfaces(listedInterfaces,
scannedClass.getScannedClass());
}
This is a bit problematic to solve because we would need to differentiate
between the null and empty case, but it seems that this is somehow not
supported by the annotations parser ?
For the moment I worked around the problem by using the following annotation,
but it's rather ugly since it still generates a service that is not needed :
@Component(service={ExtenderBundleListener.class}, immediate = true) // ideally
we would like to not specify any service but it's seems that due to a bug in
the DS annotation processor this is not possible so we use the immediate
setting instead
public class ExtenderBundleListener implements SynchronousBundleListener {
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