I don't know if this is "right" or "wrong", but I'm doing something similar
to what you describe.
I iterate through the classes in my bundle looking for classes with a
specific annotation, then I "register" those in a Map for later lookup.
import org.osgi.framework.FrameworkUtil;
import org.osgi.framework.wiring.BundleWiring;
...
public MessageHandlerFactoryImpl() {
BundleWiring wiring = (BundleWiring)
FrameworkUtil.getBundle(MessageHandlerFactoryImpl.class).adapt(BundleWiring.class);
Collection<String> resources = wiring.listResources("/", "*.class",
BundleWiring.LISTRESOURCES_RECURSE | BundleWiring.LISTRESOURCES_LOCAL);
for (String className : resources) {
className = className.replace('/', '.').substring(0,
className.length() - 6);
log.info("Checking for EventHandler in class {}", className);
try {
Class c = Class.forName(className);
if (c.isAnnotationPresent(Handler.class) &&
MessageHandler.class.isAssignableFrom(c)) {
Handler a = (Handler) c.getAnnotation(Handler.class);
registerHandler(a.name(), c);
}
} catch (Exception ex) {
log.error("Cannot register handler class {}.", className,
ex);
}
}
}
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