User Storage providers are packaged in a jar and deployed or undeployed to the {{book.project.name}} runtime in the same way you would deploy something in the JBoss/Wildfly application server. You can either copy the jar directly to the `deploy/` directory of the server, or use the JBoss CLI to execute the deployment.
In order for {{book.project.name}} to recognize the provider, you need to add a file to the jar: `META-INF/services/org.keycloak.storage.UserStorageProviderFactory`. This file must contain a line-separated list of fully qualified classnames of the `UserStorageProviderFactory` implementation:
{{book.project.name}} supports hot deployment of these provider jars. You'll also see later in this chapter that you can package it within and as Java EE components.
