[keycloak-user] user storage provider (Keycloak 2.5.0) deployed as war file: CDI does not work

Hello It is not possible for me, to bring CDI (@Inject) to work in a user storage provider application (Keycloak 2.5.0), deployed as a war-file. The required beans.xml is placed correctly in the war-file and passed by Weld during deployment, but all injected objects are null. Is this a known (and possibly perforced) behaviour, a (minor) bug or simply due to a missing trick? Thanks in advance for a feedback, Eduard Matuszak