When you specify the class to use for the factory (via ``factory_class``)

the method will be called statically. If the factory itself should be instantiated

and the resulting object's method called (as in this example), configure the

factory itself as a service:

and the resulting object's method called, configure the factory itself as a service.

In this case, the method (e.g. get) should be changed to be non-static:

..configuration-block::