code: @Override
      public IGroupMember getGroupMember(EntityIdentifier underlyingEntityIdentifier)
              throws GroupsException {
          return getGroupMember(
                  underlyingEntityIdentifier.getKey(), underlyingEntityIdentifier.getType());
      }
docs: Returns an <code>IGroupMember</code> representing either a group or a portal entity, based on
  the <code>EntityIdentifier</code>, which refers to the UNDERLYING entity for the <code>
  IGroupMember</code>.