That's my blog! Sorry to not respond to those comments on the blog, I had no idea people commented ... no email notification ... I haven't tried the docker image for a while, but you may have figured it out. That looks like an appropriate fix to me. On Tue, Dec 1, 2015 at 4:02 PM, Paul Blair <pblair(a)clearme.com&gt; wrote: > I've been using Docker with the HA configuration as described here: > http://blog.keycloak.org/2015/04/running-keycloak-cluster-with-docker.html > > I ran into the same problem as David Willson describes in the comments, > namely a NullPointerException at > org.keycloak.models.sessions.infinispan.initializer.OfflineUserSessionLoader.init(OfflineUserSessionLoader.java:25). > Looking at the code, it seems as though a UserSessionPersister was coming > back null. > > I added to keycloak-server.json the following: > > "userSessionPersister": { > "provider" : "jpa" > }, > > and now everything starts ok. Is this the appropriate fix for a clustered > configuration? > > _______________________________________________ > keycloak-user mailing list > keycloak-user(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/keycloak-user >