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By convention, Slice reads injector name from second part of a resource type, e.g. if you request a /apps/myapp/mycomponent resource, the injector name will be myapp. This may be limiting in some cases, especially if you have multiple applications running on a single Sling/AEM instance and you want to group them meaningfully. Since Slice 4.1. you can instruct Slice where to look for an application, e.g. /apps/plugins/my-super-plugin-app. In this case your injector name will be "my-super-plugin-app" instead of "plugins". You can do this by creating InjectorRunner appropriately in your application ActicatorActivator, passing applicationPath argument, e.g.:

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@Component
@Service
public class MyComponent implements InjectorListener {
	// we need to have this atomic boolean, as the injector may become available
	// a few times during component lifecycle
	private final AtomicBoolean initialized = new AtomicBoolean();

	@Activate
	protected void activate() {
		initialized.set(false);
	}

	@Override
	public void injectorAvailable(String injectorName) {
		if ("myapp".equals(injectorName) && !initialized.getAndSet(true)) {
			InjectorWithContext injector = InjectorUtil.getInjector("myapp", getResolver());
			// do something clever with the injector
		}
	}
}