VaadinServiceInitListener
The listener should be added to a which is sent when a Vaadin service is initialized.
This listener should be registered as a provider via Java SPI loading facility. To do this you should create META-INF/services
resource directory and a provider configuration file with the name . This is a text file and it should contain the fully qualified name of the ApplicationServiceInitListener
class on its own line. It allows to discover the class, instantiate it and register as a service init listener for the application.
The content of the file should be like this:
com.mycompany.ApplicationServiceInitListener