// j'ai eu �a ici et plus loin : Illegal attempt to associate a collection with two open sessions
session.update(this);
final EventList el = eventLists.get(clazz.toString());
java.util.List results =
session.createQuery("from EventGeneric as ev where ev.eventList = :event_list " +
"and ev.date >= :start_date and ev.date <= :stop_date " +
"order by ev.date asc")
.setString("event_list", el.getId().toString())
.setString("start_date", new java.sql.Timestamp(begin.getTime()).toString())
.setString("stop_date", new java.sql.Timestamp(end.getTime()).toString())