code: public Group getGroup(String id, AccessToken accessToken, String... attributes) {
          return getGroupService().getGroup(id, accessToken, attributes);
      }
docs: Retrieve a single Group with the given id. If no group with the given id can be found a {@link NoResultException}
  is thrown.
  
  @param id          the id of the wanted group
  @param accessToken the access token from OSIAM for the current session.
  @param attributes  the attributes that should be returned in the response. If none are given, all are returned
  @return the group with the given id.
  @throws UnauthorizedException             if the request could not be authorized.
  @throws NoResultException                 if no user with the given id can be found
  @throws ForbiddenException                if the scope doesn't allow this request
  @throws ConnectionInitializationException if the connection to the given OSIAM service could not be initialized
  @throws IllegalStateException             if OSIAM's endpoint(s) are not properly configured