[keycloak-user] Unable to register provider implementation: not a subtype exception

Hi folks! I followed the documentation for implementing and registering a SPI but I'm not able to deploy it correctly. The raised exception is: *java.util.ServiceConfigurationError: org.keycloak.credential.hash.PasswordHashProviderFactory: Provider org.wikitolearn.keycloak.provider.MediaWikiBTypePasswordHashProviderFactory not a subtype* I tried both registration ways but the outcome is the same. The .jar I'm trying to deployt has the following structure: - META-INF/services/org.keycloak.credential.hash.PasswordHashProviderFactory - org/wikitolearn/keycloak/provider/ MediaWikiBTypePasswordHashProviderFactory.class - org/wikitolearn/keycloak/provider/ MediaWikiBTypePasswordHashProvider.class The factory and the provider implements respectively PasswordHashProviderFactory and PasswordHashProvider. I would like also to point out that the SPI works correctly in my Keycloak fork. But as you can imagine, a fork is not a good option. Especially when are available more elegant ways to extend the software programatically without a fork. I'm looking forward to receiving your reply asap. Thank you! Alessandro