// em.createQuery("select gm from GroupMembership gm where gm.id.eventId = :eventid and (gm.placeGroup.creator = :user or gm.user = :user) order by gm.placeReservation.name",
// em.createQuery("select gm from GroupMembership gm where gm.id.eventId = :eventid and (gm.placeGroup.creator = :user or gm.user = :user) order by gm.placeReservation.name",