public List<Experiment> getSharedExperiments(User user) {
    String queryString = "from User u inner join fetch u.experiments where u.username=:username";
    Query query = dao.getEntityManager().createQuery(queryString);
    query.setParameter("username", user.getUsername());
    @SuppressWarnings("unchecked")
    List<User> users = query.getResultList();
    List<Experiment> experiments = new ArrayList<Experiment>();
    for (User userSingleE : users) {
      Object[] userExperiments = userSingleE.getExperiments().toArray();
      for (Object o : userExperiments) {
        Experiment e = (Experiment) o;
        boolean have = false;
        for (Experiment currentE : experiments) {
          if (currentE.getId() == e.getId()) have = true;
        }
        if (!have) experiments.add(e);
      }
    }

    // get experiments shared with all
    queryString = "from Experiment where shareWithAll=:shareWithAll";
    query = dao.getEntityManager().createQuery(queryString);
    query.setParameter("shareWithAll", true);
    @SuppressWarnings("unchecked")
    List<Object> experimentsSharedWithAll = query.getResultList();
    for (Object o : experimentsSharedWithAll) {
      experiments.add((Experiment) o);
    }

    for (Experiment experiment : experiments) {
      experiment.setNumDataSets(getNumDataSets(experiment));
    }

    return experiments;
  }
 public void clearSharedList(Experiment experiment) {
   List<User> userList = new ArrayList<User>();
   for (User user : experiment.getSharedList()) {
     userList.add(user);
   }
   for (User user : userList) {
     if (user.getExperiments() != null) {
       user.getExperiments().remove(experiment);
       dao.update(user);
       dao.getEntityManager().flush();
     }
   }
   experiment.getSharedList().clear();
   dao.update(experiment);
   updateActivity(experiment);
   dao.getEntityManager().flush();
 }