It would be very nice if we had a wizard or hotkey to create a new service implementation:

CTRL-N
--> New Service Implementation Class

1. Wizard asks you to specify the service Interface you wish to implement, and then lets you give the typical new-class information (with Interface already populated and greyed out.)

2. When submitted, the wizard creates the implementing class, and also creates a service file in the java-resources 'META-INF/services' directory, containing the name of your service implementation class. If the Service file already exists, your class should be added to it on a new line:

META-INF/services/org.example.service.spi.Interface