PasswordRegistry class is not declared as a component in the module descriptor and therefore it can not be injected in certain cases like in subapp instantiation.

Steps to reproduce in HelloWorld app

1. Add maven dependency to Password-manager module
2. Add PasswordRegistry parameter to the constructor:

   public HelloWorldMainSubApp(final SubAppContext subAppContext, HelloWorldMainSubAppView view, LocationController locationController, PasswordRegistry passwordRegistry) 

3. Deploy and access hello world app you will get:

   info.magnolia.objectfactory.MgnlInstantiationException: Unable to resolve parameters for constructor public info.magnolia.training.developer.admincentral.vaadin.apps.helloworld.HelloWorldMainSubApp(info.magnolia.ui.api.app.SubAppContext,info.magnolia.training.developer.admincentral.vaadin.apps.helloworld.HelloWorldMainSubAppView,info.magnolia.ui.api.location.LocationController,info.magnolia.keystore.registry.PasswordRegistry). Unresolved parameter(s) are: 4th parameter which is of type info.magnolia.keystore.registry.PasswordRegistry

This is not happening in every case PasswordRegistry is injected, for instance it is successfully injected in info.magnolia.ai.image.amazon.AmazonImageRecogniser.

PSWDMNGR-13 should be taken into account in terms of security