code: public static Object getScopeService(IScope scope, Class<?> intf, Class<?> defaultClass) {
          return getScopeService(scope, intf, defaultClass, true);
      }
docs: Returns scope service that implements a given interface.
  
  @param scope
  The scope service belongs to
  @param intf
  The interface the service must implement
  @param defaultClass
  Class that should be used to create a new service if no service was found.
  @return Service object