code: public static <T, D> List<IHandler<T, D>> scan() throws Exception {
  		return scan(false);
  	}
docs: Scans the package "module.application.service.handler" for classes
  annotated with "@Handler(protocol=...)". For every class found with this
  annotation an instance of this class is created per Java-Reflection and
  added to the result list of handlers.
  
  @return A list of instantiated and proxied handler.
  @throws Exception
  Reflection-Exception