Packaging and Deployment

User Storage providers are packaged in a jar and deployed or undeployed to the Keycloak runtime in the same exact way as you would deploy something in the JBoss/Wildfly application server. You can either copy the jar directly to the deploy/ directory if the server, or use the JBoss CLI to execute the deployment. In order for Keycloak to recognize the provider, there’s one special file you need to add to the jar: META-INF/services/ This file must contain a line separated list of fully qualified classnames of use UserStorageProviderFactory implementation.

Keycloak supports hot deployment of these provider jars. You’ll also see later in this chapter that you can package within and as Java EE components.