[keycloak-user] Keycloak Database & Authenticator

Hello, I'm trying to create a custom authenticator, however I'm running into some problems retrieving data from Keycloak's database. I've built a Jpa entity provider according to this example: https://github.com/keycloak/keycloak/tree/master/examples/providers/domai... I've deployed this as a module according to the instructions provided with the example. This part works wonderfully, and the new table appears in my database. I've also tried implementing a serviceprovider, according to the same example as previously, I could deploy this, however when I try to get the provider at runtime in a custom authenticator with: KeycloakSession.getProvider(ServiceProvider.class) the keycloak installation returns a java.lang.NoClassDefFoundError. KeycloakSession.getAllProviders(JpaEntityProvider.class) returns a HashSet containing 1 element, namely the desired provider, however this "Class has no fields". trying to do anything further using this object results in the above exception. What am I doing wrong here? Thanks, Marten Krings