Hi Lincoln,

Are you trying to to do something like that:

        User someUser = createUser("someUser");
        Group someGroup = createGroup("someGroup", null);

        RelationshipManager relationshipManager = getPartitionManager().createRelationshipManager();

        BasicModel.addToGroup(relationshipManager, someUser, someGroup);

        // user has a membership relationship, and when we use isMember with a null group we get a NPE. 
        assertTrue(BasicModel.isMember(relationshipManager, someUser, null));

If so, we can avoid the NPE an throw a IdentityManagementException. I believe that this issue requires a review of all BasicModel methods in order to avoid such wrong behaviour.

Thanks.
Pedro Igor

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