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

[Jitendra Chouhan]

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/content/v/2.3/topics/mongo.html"
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