How to use

getInstance

method

in

org.keycloak.models.UserFederationProviderFactory

@GET
@Path("/user-by-username-from-fed-factory")
@Produces(MediaType.APPLICATION_JSON)
public UserRepresentation getUserByUsernameFromFedProviderFactory(@QueryParam("realmName") String realmName,
                                 @QueryParam("userName") String userName) {
  RealmModel realm = getRealmByName(realmName);
  UserFederationProviderFactory factory = (UserFederationProviderFactory)session.getKeycloakSessionFactory().getProviderFactory(UserFederationProvider.class, "dummy");
  UserModel user = factory.getInstance(session, null).getUserByUsername(realm, userName);
  if (user == null) return null;
  return ModelToRepresentation.toRepresentation(user);
}

protected UserFederationProvider getFederationProvider(UserFederationProviderModel model) {
  UserFederationProviderFactory factory = (UserFederationProviderFactory)session.getKeycloakSessionFactory().getProviderFactory(UserFederationProvider.class, model.getProviderName());
  return factory.getInstance(session, model);
}