[keycloak-user] Join Group Issue in keycloak2.3.0 with mongo db

Hi, We are evaluating keycloak-2.3.0 in standalone mode as well as with docker images. During our validations we came across issue with group assignment to user. Please find below listed information. Everything works fine when we do our testing keycloak-2.3.0 with default configuration which uses h2 database internally. We encounter issue with group assignment(others functionality working fine) when we use mongo db as external database to store information. Just to let you know we have configured mongo db related configuration in keycloak by referencing " https://keycloak.gitbooks.io/server-installation-and-configuration/conten... link. Upon checking backed server logs we found below stack trace: Caused by: java.lang.NullPointerException at org.keycloak.models.mongo.keycloak.adapters.UserAdapter.isMemberOf(UserAdapter.java:263) at org.keycloak.models.cache.infinispan.UserAdapter.isMemberOf(UserAdapter.java:368) at org.keycloak.services.resources.admin.UsersResource.joinGroup(UsersResource.java:992) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:139) at org.jboss.resteasy.core.ResourceMethodInvoker.invokeOnTarget(ResourceMethodInvoker.java:295) at org.jboss.resteasy.core.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:249) at org.jboss.resteasy.core.ResourceLocatorInvoker.invokeOnTargetObject(ResourceLocatorInvoker.java:138) at org.jboss.resteasy.core.ResourceLocatorInvoker.invoke(ResourceLocatorInvoker.java:107) at org.jboss.resteasy.core.ResourceLocatorInvoker.invokeOnTargetObject(ResourceLocatorInvoker.java:133) at org.jboss.resteasy.core.ResourceLocatorInvoker.invoke(ResourceLocatorInvoker.java:107) at org.jboss.resteasy.core.ResourceLocatorInvoker.invokeOnTargetObject(ResourceLocatorInvoker.java:133) at org.jboss.resteasy.core.ResourceLocatorInvoker.invoke(ResourceLocatorInvoker.java:101) at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:395) Everything works fine with keycloak-2.2.1 version. Please confirm if this is an issue or something is wrong. Thanks, Jitendra Chouhan